walle | Android Signature V2 Scheme签名下的新一代渠道包打包神器 | Plugin library

by Meituan-Dianping Java Version: v1.1.6 License: Apache-2.0

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kandi X-RAY | walle Summary

walle is a Java library typically used in Plugin, Gradle applications. walle has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has medium support. You can download it from GitHub.

Walle（瓦力）：Android Signature V2 Scheme签名下的新一代渠道包打包神器.

Support

Quality

Security

License

Reuse

kandi-support Support

walle has a medium active ecosystem.
It has 6188 star(s) with 953 fork(s). There are 165 watchers for this library.
It had no major release in the last 12 months.
There are 96 open issues and 235 have been closed. On average issues are closed in 37 days. There are 1 open pull requests and 0 closed requests.
It has a neutral sentiment in the developer community.
The latest version of walle is v1.1.6

walle Support

Best in #Plugin

Average in #Plugin

walle Support

Best in #Plugin

Average in #Plugin

quality kandi Quality

walle has 0 bugs and 0 code smells.

walle Quality

Best in #Plugin

Average in #Plugin

walle Quality

Best in #Plugin

Average in #Plugin

security Security

walle has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
walle code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

walle Security

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Average in #Plugin

walle Security

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Average in #Plugin

license License

walle is licensed under the Apache-2.0 License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.

walle License

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Average in #Plugin

walle License

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Average in #Plugin

build Reuse

walle releases are available to install and integrate.
Build file is available. You can build the component from source.
Installation instructions, examples and code snippets are available.
walle saves you 2291 person hours of effort in developing the same functionality from scratch.
It has 5005 lines of code, 389 functions and 62 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

walle Reuse

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Average in #Plugin

walle Reuse

Best in #Plugin

Average in #Plugin

Top functions reviewed by kandi - BETA

kandi has reviewed walle and discovered the below as its top functions. This is intended to give you an instant insight into walle implemented functionality, and help decide if they suit your requirements.

Parse the signature section .
Handle the apk signing block .
Returns the input jar entries .
Generates a signed signature block .
Generates the SHA - 1 signature file for the given APK signature scheme .
Returns the length of the comment in bytes .
Write an APK signature block .
Finds the sections in the archive .
Find the end of the end of the ZIP file .
Get all id values from apk file .

walle Key Features

Android Signature V2 Scheme签名下的新一代渠道包打包神器

walle Examples and Code Snippets

See all related Code Snippets

Gradle插件使用方式

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buildscript {
    dependencies {
        classpath 'com.meituan.android.walle:plugin:1.1.7'
    }
}

License

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Copyright 2017 Meituan-Dianping

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

How can I target the inner html of each cell in a table row that I've clicked on?

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const save = document.querySelectorAll(".save"); // select all the buttons
const rows = document.querySelectorAll("tr") // select all the rows

console.log(rows)


save.forEach((btn) => {
  btn.addEventListener("click", (e) => {
    let id = e.target.getAttribute('button-id') // get the clicked buttons id
    console.log(id)
    console.log(rows[id]) // with id select the row
  });
})

<table class="table">
  <tr>
    <th>Trails</th>
    <th>Province</th>
    <th>Country</th>
  </tr>
  <tr>
    <td class="tableRow">Lion's Head</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="1" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Pipe Track</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="2" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Skeleton Gorge</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="3" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Table Mountain</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="4" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">King Fisher Trail</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="5" button class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Robberg Peninsula</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="6" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Diep Walle Forest Walk</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="7" class="save">Save</button></td>
  </tr>
</table>

-----------------------

const save = document.querySelectorAll(".save"); // select all the buttons
const rows = document.querySelectorAll("tr") // select all the rows

console.log(rows)


save.forEach((btn) => {
  btn.addEventListener("click", (e) => {
    let id = e.target.getAttribute('button-id') // get the clicked buttons id
    console.log(id)
    console.log(rows[id]) // with id select the row
  });
})

<table class="table">
  <tr>
    <th>Trails</th>
    <th>Province</th>
    <th>Country</th>
  </tr>
  <tr>
    <td class="tableRow">Lion's Head</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="1" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Pipe Track</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="2" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Skeleton Gorge</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="3" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Table Mountain</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="4" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">King Fisher Trail</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="5" button class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Robberg Peninsula</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="6" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Diep Walle Forest Walk</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="7" class="save">Save</button></td>
  </tr>
</table>

-----------------------

const table = document.getElementById('myTable');

table.addEventListener("click", (event) => {
  if (event.target.matches('button.save')) {
    const row = event.target.closest('tr');
    console.log(row.innerText);
  }
});

<table class="table" id="myTable">
  <thead>
    <tr>
      <th>Trails</th>
      <th>Province</th>
      <th>Country</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td class="tableRow">Lion's Head</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Pipe Track</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Skeleton Gorge</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Table Mountain</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">King Fisher Trail</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Robberg Peninsula</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Diep Walle Forest Walk</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
  </tbody>
</table>

-----------------------

const table = document.getElementById('myTable');

table.addEventListener("click", (event) => {
  if (event.target.matches('button.save')) {
    const row = event.target.closest('tr');
    console.log(row.innerText);
  }
});

<table class="table" id="myTable">
  <thead>
    <tr>
      <th>Trails</th>
      <th>Province</th>
      <th>Country</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td class="tableRow">Lion's Head</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Pipe Track</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Skeleton Gorge</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Table Mountain</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">King Fisher Trail</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Robberg Peninsula</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
    <tr>
      <td class="tableRow">Diep Walle Forest Walk</td>
      <td class="tableRow">Western Cape</td>
      <td class="tableRow">South Africa<button class="save">Save</button></td>
    </tr>
  </tbody>
</table>

-----------------------

const save = document.querySelectorAll(".save");

save.forEach(s => {
  s.addEventListener("click", (e) => {    
    const row = e.target.parentNode.parentNode;
    row.classList.toggle('border');
    console.log(row)
    //
  });
});

.border {
  background: red;  
}

<table class="table">
            <tr>
              <th>Trails</th>
              <th>Province</th>
              <th>Country</th>
            </tr>
            <tr>
              <td class="tableRow">Lion's Head</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Pipe Track</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Skeleton Gorge</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Table Mountain</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">King Fisher Trail</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Robberg Peninsula</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Diep Walle Forest Walk</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
          </table>

-----------------------

const save = document.querySelectorAll(".save");

save.forEach(s => {
  s.addEventListener("click", (e) => {    
    const row = e.target.parentNode.parentNode;
    row.classList.toggle('border');
    console.log(row)
    //
  });
});

.border {
  background: red;  
}

<table class="table">
            <tr>
              <th>Trails</th>
              <th>Province</th>
              <th>Country</th>
            </tr>
            <tr>
              <td class="tableRow">Lion's Head</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Pipe Track</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Skeleton Gorge</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Table Mountain</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">King Fisher Trail</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Robberg Peninsula</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Diep Walle Forest Walk</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
          </table>

-----------------------

const save = document.querySelectorAll(".save");

save.forEach(s => {
  s.addEventListener("click", (e) => {    
    const row = e.target.parentNode.parentNode;
    row.classList.toggle('border');
    console.log(row)
    //
  });
});

.border {
  background: red;  
}

<table class="table">
            <tr>
              <th>Trails</th>
              <th>Province</th>
              <th>Country</th>
            </tr>
            <tr>
              <td class="tableRow">Lion's Head</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Pipe Track</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Skeleton Gorge</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Table Mountain</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">King Fisher Trail</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Robberg Peninsula</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Diep Walle Forest Walk</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
          </table>

How to paint a component on a JPanel?

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src/
    images/
        happy.png
    stackoverflow/
        Main.java

package stackoverflow;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) {
        new Main();
    }

    public Main() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    JFrame frame = new JFrame();
                    frame.add(new TestPane());
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }

    public class TestPane extends JPanel {

        private BufferedImage image;

        public TestPane() throws IOException {
            image = ImageIO.read(getClass().getResource("/images/happy.png"));            
        }

        @Override
        public Dimension getPreferredSize() {
            return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (image == null) {
                return;
            }
            Graphics2D g2d = (Graphics2D) g.create();
            int x = (getWidth() - image.getWidth()) / 2;
            int y = (getHeight() - image.getHeight()) / 2;
            g2d.drawImage(image, x, y, this);
            g2d.dispose();
        }

    }
}

-----------------------

src/
    images/
        happy.png
    stackoverflow/
        Main.java

package stackoverflow;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) {
        new Main();
    }

    public Main() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    JFrame frame = new JFrame();
                    frame.add(new TestPane());
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }

    public class TestPane extends JPanel {

        private BufferedImage image;

        public TestPane() throws IOException {
            image = ImageIO.read(getClass().getResource("/images/happy.png"));            
        }

        @Override
        public Dimension getPreferredSize() {
            return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (image == null) {
                return;
            }
            Graphics2D g2d = (Graphics2D) g.create();
            int x = (getWidth() - image.getWidth()) / 2;
            int y = (getHeight() - image.getHeight()) / 2;
            g2d.drawImage(image, x, y, this);
            g2d.dispose();
        }

    }
}

Gstreamer Android HW accelerated H.264 encoding

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rtspsrc location=rtsp://192.168.1.239:8554/test latency=300 ! application/x-rtp,encoding-name=H264 ! decodebin ! autovideosink

Loop through array contain objects and create different arrays from it

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$array = [
    (object)['length' => 4658, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5555, 'user_id' => 19220, 'user_name' => 'Michael'],
    (object)['length' => 2552, 'user_id' => 19220, 'user_name' => 'Michael']
];

$new = [];
foreach( $array as $a ) {
    if ( ! array_key_exists($a->user_id, $new) ) {
        $new[$a->user_id] = $a;    
    } else {
        echo $new[$a->user_id]->length . PHP_EOL;
        $new[$a->user_id]->length += $a->length;    
    }
    
}

print_r($new);

Array
(
    [1922053] => stdClass Object
        (
            [length] => 4663
            [user_id] => 1922053
            [user_name] => Walled
        )
    [19220] => stdClass Object
        (
            [length] => 8107
            [user_id] => 19220
            [user_name] => Michael
        )
)

-----------------------

$array = [
    (object)['length' => 4658, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5555, 'user_id' => 19220, 'user_name' => 'Michael'],
    (object)['length' => 2552, 'user_id' => 19220, 'user_name' => 'Michael']
];

$new = [];
foreach( $array as $a ) {
    if ( ! array_key_exists($a->user_id, $new) ) {
        $new[$a->user_id] = $a;    
    } else {
        echo $new[$a->user_id]->length . PHP_EOL;
        $new[$a->user_id]->length += $a->length;    
    }
    
}

print_r($new);

Array
(
    [1922053] => stdClass Object
        (
            [length] => 4663
            [user_id] => 1922053
            [user_name] => Walled
        )
    [19220] => stdClass Object
        (
            [length] => 8107
            [user_id] => 19220
            [user_name] => Michael
        )
)

Bug in my recursive division algorithm (to generate maze randomly)

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class Maze {
    static Cell = class {
        constructor(x, y, left, above) {
            this.x = x;
            this.y = y;
            this.neighbors = [left ?? null, above ?? null, null, null];
            // Also set link in opposite direction
            if (left) left.neighbors[2] = this;
            if (above) above.neighbors[3] = this;
        }
        
        block(direction) { 
            // Place a wall by clearing neighbor link
            if (this.neighbors[direction]) this.neighbors[direction][direction ^ 2] = null;
            this.neighbors[direction] = null;
        }
    }
    
    constructor(parent, numCols, numRows) {
        this.parentDiv = parent;
        
        let above = [];
        this.maze = Array.from({length: numRows}, (_, y) => {
            let left = null;
            return above = Array.from({length: numCols}, (_, x) => left = new Maze.Cell(x, y, left, above[x]));
        });
        this.recursiveDivision(0, 0, numCols, numRows);
    }


    recursiveDivision(left, top, right, bottom, its=0) {
        const randInt = (min, max) => Math.floor(Math.random() * (max - min)) + min;

        const width = right - left;
        const height = bottom - top;
        // Base case: cannot be divided further:
        if (width < 2 || height < 2) return; 
        let choice = randInt(0, (width - 1) + (height - 1));
        if (choice >= width - 1) { // Place horizontal wall
            const y = top + choice - (width - 2);
            const gap = randInt(left, right);
            for (let x = left; x < right; x++) {
                if (x != gap) this.maze[y][x].block(1);
            }
            this.recursiveDivision(left, top, right, y, its+1);
            this.recursiveDivision(left, y, right, bottom, its+1);
        } else { // Place vertical wall
            const x = left + choice + 1;
            const gap = randInt(top, bottom);
            for (let y = top; y < bottom; y++) {
                if (y != gap) this.maze[y][x].block(0);
            }
            this.recursiveDivision(left, top, x, bottom, its+1);
            this.recursiveDivision(x, top, right, bottom, its+1);
        }
    }

    display() {
        this.parentDiv.innerHTML = "";
        const container = document.createElement("div");
        container.className = "maze";
        for (const row of this.maze) {
            const rowDiv = document.createElement("div");
            for (const cell of row) {
                const cellDiv = document.createElement("div");
                cellDiv.className = ["left", "top", "right", "bottom"].filter((_, i) => !cell.neighbors[i]).join(" ");
                rowDiv.appendChild(cellDiv);
            }
            container.appendChild(rowDiv);
        }
        this.parentDiv.appendChild(container);
    }
}

const myMaze = new Maze(document.getElementById("maze-container"), 30, 10);
myMaze.display();

body, html { margin: 0 }
#maze-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.maze {
    position: relative;
    background-color: #a7c53f;
    background-size: 8em 8em;
}
.maze div {
    display: flex;
}
.maze div div {
    box-sizing: border-box;
    position: relative;
    width: 1.2rem;
    height: 1.2rem;
}
.left { border-left: 1px solid black }
.right { border-right: 1px solid black }
.top { border-top: 1px solid black }
.bottom { border-bottom: 1px solid black }

<div id="maze-container"></div>

-----------------------

class Maze {
    static Cell = class {
        constructor(x, y, left, above) {
            this.x = x;
            this.y = y;
            this.neighbors = [left ?? null, above ?? null, null, null];
            // Also set link in opposite direction
            if (left) left.neighbors[2] = this;
            if (above) above.neighbors[3] = this;
        }
        
        block(direction) { 
            // Place a wall by clearing neighbor link
            if (this.neighbors[direction]) this.neighbors[direction][direction ^ 2] = null;
            this.neighbors[direction] = null;
        }
    }
    
    constructor(parent, numCols, numRows) {
        this.parentDiv = parent;
        
        let above = [];
        this.maze = Array.from({length: numRows}, (_, y) => {
            let left = null;
            return above = Array.from({length: numCols}, (_, x) => left = new Maze.Cell(x, y, left, above[x]));
        });
        this.recursiveDivision(0, 0, numCols, numRows);
    }


    recursiveDivision(left, top, right, bottom, its=0) {
        const randInt = (min, max) => Math.floor(Math.random() * (max - min)) + min;

        const width = right - left;
        const height = bottom - top;
        // Base case: cannot be divided further:
        if (width < 2 || height < 2) return; 
        let choice = randInt(0, (width - 1) + (height - 1));
        if (choice >= width - 1) { // Place horizontal wall
            const y = top + choice - (width - 2);
            const gap = randInt(left, right);
            for (let x = left; x < right; x++) {
                if (x != gap) this.maze[y][x].block(1);
            }
            this.recursiveDivision(left, top, right, y, its+1);
            this.recursiveDivision(left, y, right, bottom, its+1);
        } else { // Place vertical wall
            const x = left + choice + 1;
            const gap = randInt(top, bottom);
            for (let y = top; y < bottom; y++) {
                if (y != gap) this.maze[y][x].block(0);
            }
            this.recursiveDivision(left, top, x, bottom, its+1);
            this.recursiveDivision(x, top, right, bottom, its+1);
        }
    }

    display() {
        this.parentDiv.innerHTML = "";
        const container = document.createElement("div");
        container.className = "maze";
        for (const row of this.maze) {
            const rowDiv = document.createElement("div");
            for (const cell of row) {
                const cellDiv = document.createElement("div");
                cellDiv.className = ["left", "top", "right", "bottom"].filter((_, i) => !cell.neighbors[i]).join(" ");
                rowDiv.appendChild(cellDiv);
            }
            container.appendChild(rowDiv);
        }
        this.parentDiv.appendChild(container);
    }
}

const myMaze = new Maze(document.getElementById("maze-container"), 30, 10);
myMaze.display();

body, html { margin: 0 }
#maze-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.maze {
    position: relative;
    background-color: #a7c53f;
    background-size: 8em 8em;
}
.maze div {
    display: flex;
}
.maze div div {
    box-sizing: border-box;
    position: relative;
    width: 1.2rem;
    height: 1.2rem;
}
.left { border-left: 1px solid black }
.right { border-right: 1px solid black }
.top { border-top: 1px solid black }
.bottom { border-bottom: 1px solid black }

<div id="maze-container"></div>

-----------------------

class Maze {
    static Cell = class {
        constructor(x, y, left, above) {
            this.x = x;
            this.y = y;
            this.neighbors = [left ?? null, above ?? null, null, null];
            // Also set link in opposite direction
            if (left) left.neighbors[2] = this;
            if (above) above.neighbors[3] = this;
        }
        
        block(direction) { 
            // Place a wall by clearing neighbor link
            if (this.neighbors[direction]) this.neighbors[direction][direction ^ 2] = null;
            this.neighbors[direction] = null;
        }
    }
    
    constructor(parent, numCols, numRows) {
        this.parentDiv = parent;
        
        let above = [];
        this.maze = Array.from({length: numRows}, (_, y) => {
            let left = null;
            return above = Array.from({length: numCols}, (_, x) => left = new Maze.Cell(x, y, left, above[x]));
        });
        this.recursiveDivision(0, 0, numCols, numRows);
    }


    recursiveDivision(left, top, right, bottom, its=0) {
        const randInt = (min, max) => Math.floor(Math.random() * (max - min)) + min;

        const width = right - left;
        const height = bottom - top;
        // Base case: cannot be divided further:
        if (width < 2 || height < 2) return; 
        let choice = randInt(0, (width - 1) + (height - 1));
        if (choice >= width - 1) { // Place horizontal wall
            const y = top + choice - (width - 2);
            const gap = randInt(left, right);
            for (let x = left; x < right; x++) {
                if (x != gap) this.maze[y][x].block(1);
            }
            this.recursiveDivision(left, top, right, y, its+1);
            this.recursiveDivision(left, y, right, bottom, its+1);
        } else { // Place vertical wall
            const x = left + choice + 1;
            const gap = randInt(top, bottom);
            for (let y = top; y < bottom; y++) {
                if (y != gap) this.maze[y][x].block(0);
            }
            this.recursiveDivision(left, top, x, bottom, its+1);
            this.recursiveDivision(x, top, right, bottom, its+1);
        }
    }

    display() {
        this.parentDiv.innerHTML = "";
        const container = document.createElement("div");
        container.className = "maze";
        for (const row of this.maze) {
            const rowDiv = document.createElement("div");
            for (const cell of row) {
                const cellDiv = document.createElement("div");
                cellDiv.className = ["left", "top", "right", "bottom"].filter((_, i) => !cell.neighbors[i]).join(" ");
                rowDiv.appendChild(cellDiv);
            }
            container.appendChild(rowDiv);
        }
        this.parentDiv.appendChild(container);
    }
}

const myMaze = new Maze(document.getElementById("maze-container"), 30, 10);
myMaze.display();

body, html { margin: 0 }
#maze-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.maze {
    position: relative;
    background-color: #a7c53f;
    background-size: 8em 8em;
}
.maze div {
    display: flex;
}
.maze div div {
    box-sizing: border-box;
    position: relative;
    width: 1.2rem;
    height: 1.2rem;
}
.left { border-left: 1px solid black }
.right { border-right: 1px solid black }
.top { border-top: 1px solid black }
.bottom { border-bottom: 1px solid black }

<div id="maze-container"></div>

How can i refactor these functions?

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public enum WallPlacementResult{
    Success,
    NotOnTheSameLine,
    TooLong
    ...
}

WallPlacementResult CheckWallRequirements(){
      if (WallIsNotOnTheSameLine()) return WallPlacementResult.NotOnTheSameLine;
      if (WallIsTooLong()) return WallPlacementResult.TooLong;
      ...
    return WallPlacementResult.Success;
}

void SendAppropriateMessage(WallPlacementResult result)
{
    switch(result){
        case WallPlacementResult.NotOnTheSameLine:
             _player.output?.DisplayWallHasPositionBeyondBoardMessage();
        break;
        case WallPlacementResult.TooLong:
        ...
    }
}

Terraform filter based on map's minor key on lists of maps

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variable "values_default" {
  default = [
{A="abc", B="10"},
{A="cdea", B="111"},
]
}

# FOR CASE 3, but works for other cases as well
variable "new_config" {
    default = []
}


  locals {
  
    # get keys avaiable in our vars
    keys_default =   [for v in var.values_default: v.A]
    keys_new =   [for v in var.new_config: v.A]
    keys_all = distinct(concat(local.keys_default, local.keys_new))
    
    # find common keys that need to be potentailly overwritten
    # using min of B values
    keys_common = setintersection(local.keys_default, local.keys_new)

    # construct overwritten values, if there are any
    # keys must be unique in both vars (no duplicates present)
    overwritten_values = [ for idx, key in local.keys_common:
       {
              A = key
              B = min([for v in var.values_default: v.B if v.A == key][0], 
                      [for v in var.new_config: v.B if v.A == key][0])
       }
    ]
    
    keys_different = setsubtract(local.keys_all, local.keys_common) 

    new_values =  [ for idx, key in local.keys_different:
       {
              A = key
              B = concat([for v in var.values_default: v.B if v.A == key], 
                        [for v in var.new_config: v.B if v.A == key])
       }
    ]
}

output "test" {
 value = concat(local.overwritten_values, local.new_values)
}

test = [
  {
    "A" = "abc"
    "B" = [
      "10",
    ]
  },
  {
    "A" = "cdea"
    "B" = [
      "111",
    ]
  },
]

-----------------------



variable "values_default" {
  default = [
{A="abc", B="10"},
{A="cdea", B="111"},
]
}

# FOR CASE 3, but works for other cases as well
variable "new_config" {
    default = []
}


  locals {
  
    # get keys avaiable in our vars
    keys_default =   [for v in var.values_default: v.A]
    keys_new =   [for v in var.new_config: v.A]
    keys_all = distinct(concat(local.keys_default, local.keys_new))
    
    # find common keys that need to be potentailly overwritten
    # using min of B values
    keys_common = setintersection(local.keys_default, local.keys_new)

    # construct overwritten values, if there are any
    # keys must be unique in both vars (no duplicates present)
    overwritten_values = [ for idx, key in local.keys_common:
       {
              A = key
              B = min([for v in var.values_default: v.B if v.A == key][0], 
                      [for v in var.new_config: v.B if v.A == key][0])
       }
    ]
    
    keys_different = setsubtract(local.keys_all, local.keys_common) 

    new_values =  [ for idx, key in local.keys_different:
       {
              A = key
              B = concat([for v in var.values_default: v.B if v.A == key], 
                        [for v in var.new_config: v.B if v.A == key])
       }
    ]
}

output "test" {
 value = concat(local.overwritten_values, local.new_values)
}

test = [
  {
    "A" = "abc"
    "B" = [
      "10",
    ]
  },
  {
    "A" = "cdea"
    "B" = [
      "111",
    ]
  },
]

How do I use rule in another rule in prolog

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extends(A, C) :- rel1(A, C).
extends(A, C) :- rel1(A, B), extends(B, C).

?- extends(X, 'Human').
X = 'Hunter' ;
false.

?- extends(X, 'Machine').
X = 'Robot' ;
X = 'WallE' ;
false.

provides_action(X, L) :-
   findall(Y, rel2(Y,X), L1),
   findall(C, (member(A, L1), extends(C, A)), L2),
   append(L1, L2, L).

?- provides_action('Run', L).
L = ['Human', 'Machine', 'Hunter', 'Robot', 'WallE'].

-----------------------

extends(A, C) :- rel1(A, C).
extends(A, C) :- rel1(A, B), extends(B, C).

?- extends(X, 'Human').
X = 'Hunter' ;
false.

?- extends(X, 'Machine').
X = 'Robot' ;
X = 'WallE' ;
false.

provides_action(X, L) :-
   findall(Y, rel2(Y,X), L1),
   findall(C, (member(A, L1), extends(C, A)), L2),
   append(L1, L2, L).

?- provides_action('Run', L).
L = ['Human', 'Machine', 'Hunter', 'Robot', 'WallE'].

-----------------------

extends(A, C) :- rel1(A, C).
extends(A, C) :- rel1(A, B), extends(B, C).

?- extends(X, 'Human').
X = 'Hunter' ;
false.

?- extends(X, 'Machine').
X = 'Robot' ;
X = 'WallE' ;
false.

provides_action(X, L) :-
   findall(Y, rel2(Y,X), L1),
   findall(C, (member(A, L1), extends(C, A)), L2),
   append(L1, L2, L).

?- provides_action('Run', L).
L = ['Human', 'Machine', 'Hunter', 'Robot', 'WallE'].

-----------------------

extends(A, C) :- rel1(A, C).
extends(A, C) :- rel1(A, B), extends(B, C).

?- extends(X, 'Human').
X = 'Hunter' ;
false.

?- extends(X, 'Machine').
X = 'Robot' ;
X = 'WallE' ;
false.

provides_action(X, L) :-
   findall(Y, rel2(Y,X), L1),
   findall(C, (member(A, L1), extends(C, A)), L2),
   append(L1, L2, L).

?- provides_action('Run', L).
L = ['Human', 'Machine', 'Hunter', 'Robot', 'WallE'].

How to remove the arrows icons from a Material UI TextField

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return (
    <Autocomplete
      style={{ width: 300 }}
      options={top100Films}
      freeSolo
      getOptionLabel={(option) => option.title}
      renderInput={(params) => (
        <TextField
          {...params}
          variant="outlined"
          margin="normal"
          required
          fullWidth
          autoFocus
          classes={{ notchedOutline: classes.input }}
          // onChange={handlePhoneNumberChange}
          placeholder="Search..."
          type="search"
          InputProps={{
            ...params.InputProps,
            startAdornment: (
              <InputAdornment position="start">
                <SearchIcon />
              </InputAdornment>
            ),
            classes: { notchedOutline: classes.noBorder }
          }}
        />
      )}
      renderOption={(option, { inputValue }) => {
        const matches = match(option.title, inputValue);
        const parts = parse(option.title, matches);

        return (
          <div>
            {parts.map((part, index) => (
              <span
                key={index}
                style={{ fontWeight: part.highlight ? 700 : 400 }}
              >
                {part.text}
              </span>
            ))}
          </div>
        );
      }}
    />
  );

-----------------------

.MuiAutocomplete-popupIndicator {
 display: none !important;
}

Material UI Autocomplete not working using modified TextField

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 renderInput={(params) => (
          <TextField
            {...params}
            variant="outlined"
            margin="normal"
            required
            fullWidth
            // disableUnderline={false}
            autoFocus
            classes={{notchedOutline:classes.input}}

            // onChange={handlePhoneNumberChange}
            className={classes.textField}
            placeholder="Search..."
            InputProps={{
             ...params.InputProps, // this is new
              startAdornment: (
                <InputAdornment position="start">
                  <SearchIcon />
                </InputAdornment>
              ),
              classes:{notchedOutline:classes.noBorder}
            }}
          />
        // <TextField {...params} label="Highlights" variant="outlined" margin="normal" />
      )}

See all related Code Snippets

Community Discussions

Trending Discussions on walle

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How to paint a component on a JPanel?
Gstreamer Android HW accelerated H.264 encoding
Loop through array contain objects and create different arrays from it
Bug in my recursive division algorithm (to generate maze randomly)
How can i refactor these functions?
Terraform filter based on map's minor key on lists of maps
AccessException: Attempted To Read Or Write Protected/Corrupted Memory -- Known Exception, Unknown Reason?
How do I use rule in another rule in prolog

Trending Discussions on walle

QUESTION

Why do I receive this ReferenceError?

Asked 2022-Mar-25 at 11:34

ReferenceError: array is not defined

I've been trying to add click event listeners to multiple buttons but when I run it in the console it gives me the referenceError above.

Below is my javascript code:

let buttons = document.querySelectorAll(".save");
console.log(array);

buttons.forEach((button) => {
  button.addEventListener("click", () => {
    alert("forEach worked");
  });
});

I have looked at other questions on StackOverFlow for an answer, but they basically all say that I should put the tag at that the end of the html body so that the html can load before. I tried this and it doesn't work still.

Here is my html code for reference:

<body>
    <div class="Container1">
        <li class="dropdown">
              <ul class="dropdown-menu dropdown-menu--animated">
              </li>
              <a class="dropdown-items" href="equiptment.html">Equiptment</a> <a class="dropdown-items" href="gallery.html">Gallery</a>
              <a class="dropdown-items" href="trails.html">Trails</a><a class="dropdown-items" href="signup.html">Sign Up</a><a class="dropdown-items" href="saveForLater.html">Saved For Later</a><a class="dropdown-items" href="/index.html">Back to Menu</a>
              
            </li>
            </ul>
            Hiking</li>
          </div>
          
          <div class="text-container">
          
        </div>

        <h1 class="trails-head">Trails</h1>
        <h2 class="trails-h2">One of the things that makes hiking so exciting is endless options of trails you can take,each each is a very different experience. Hiking is also an incredible way to keep fit while discoering new places. Additionally it is a very social activity and is an amazing activity for friends, work colleagues or any other group.</h2>
        <h3 class="trails-h3">Different Terrain</h3>
        <h4 class="trails-h4">With different terrain comes a different experience. But it also comes with different preparations and equiptment. With a dry and rocky hike it is better to wear good hiking boots with decent grip. You could also bring a walking stick to help with stability in the more difficult patches of the hike. If you are planning hiking in a snowy and frozen climate it is of course better to wear hiking boots with ice grip or spikes. It is of course going to be colder and then it is smart to pack some warm but lightweight clothes.</h4>
        
        
        <div class="tableDiv">
        <h5 class="trails-h5">South African Hikes</h4>
            
          <table class="table">
            <tr>
              <th>Trails</th>
              <th>Province</th>
              <th>Country</th>
            </tr>
            <tr>
              <td class="tableRow">Lion's Head</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Pipe Track</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Skeleton Gorge</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Table Mountain</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">King Fisher Trail</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Robberg Peninsula</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Diep Walle Forest Walk</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button class="save">Save</button></td>
            </tr>
          </table>
        </div>
          
          <!-- <input class="radio" type="submit">Radio</input> -->
          
          <img class="trails-img" src="/norway.jpeg">
          <img src="hiking7.jpg" class="hiking7"  />
          <p class="newsletter">Sign up to our news letters at the bottom of the this page</p>
          <div class="radio-div">
            <label>Age</label><br>
            <input type="radio" id="under_13" name="user_age"><label><label for="under_13" class="light">Under 13</label><br>
            <input type="radio" id="over_13" name="user_age"><label><label for="under_13" class="light">Over 13</label><br> 
            <label>Gender</label><br> 
            <input type="radio" id="under_13" name="user_gender"><label><label for="under_13" class="light">Male</label> <br> 
            <input type="radio" id="under_13" name="user_gender"><label><label for="under_13" class="light">Female</label> <br> 
            <label>Sign up to news letter</label> <br> 
            <input type="radio" id="under_13" name="newsletter"><label><label for="under_13" class="light">Yes</label> <br> 
            <input type="radio" id="under_13" name="newsletter"><label><label for="under_13" class="light">No</label> <br> 
            <label>Recieve emails of new trails and hikes</label> <br> 
            <input type="radio" id="under_13" name="recieve-emails"><label><label for="under_13" class="light">Yes</label> <br> 
            <input type="radio" id="under_13" name="recieve-emails"><label><label for="under_13" class="light">No</label> <br> 
          </div>
          <script src="saveForLater.js"></script>
        </body>

ANSWER

Answered 2022-Mar-25 at 11:34

The problem is console.logging an array object, that doesn't exist. After deleting the line, ReferenceError shouldn't be a problem.

Source https://stackoverflow.com/questions/71616212

QUESTION

How can I target the inner html of each cell in a table row that I've clicked on?

Asked 2022-Mar-24 at 14:31

I am trying to create a function on my website so that users can click a "save" button on a particular row of this table that will pull up the innerHtml of the entire row element that they have selected and then Im going to put that info into another page for them as their saved hiking trails.

I have been trying to do this by adding click event listeners to the tables and then accessing the information of the table row through the target.

Does anyone know how I can access the inner html of the whole row and not just the cell that the save button is in?

Here is my html

<table class="table">
            <tr>
              <th>Trails</th>
              <th>Province</th>
              <th>Country</th>
            </tr>
            <tr>
              <td class="tableRow">Lion's Head</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Pipe Track</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Skeleton Gorge</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Table Mountain</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">King Fisher Trail</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" button class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Robberg Peninsula</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
            <tr>
              <td class="tableRow">Diep Walle Forest Walk</td>
              <td class="tableRow">Western Cape</td>
              <td class="tableRow">South Africa<button id="save" class="save">Save</button></td>
            </tr>
          </table>

And here is the javascript that I have tried to use to target the row that I need.

const save = document.querySelector(".save");
console.log(save);

save.addEventListener("click", (e) => {
  let row = document.getElementsByClassName("tableRow");
  console.log(row[1], row[2], row[3]);
});

This javascript is not targeting the right table cells.

Any advice is appreciated! Thanks!

ANSWER

Answered 2022-Mar-24 at 14:04

You can't give same id's to different elements in DOM but you can create your custom attributes. I created button-id for each button. Then used it to get the row that is clicked.

const save = document.querySelectorAll(".save"); // select all the buttons
const rows = document.querySelectorAll("tr") // select all the rows

console.log(rows)


save.forEach((btn) => {
  btn.addEventListener("click", (e) => {
    let id = e.target.getAttribute('button-id') // get the clicked buttons id
    console.log(id)
    console.log(rows[id]) // with id select the row
  });
})

<table class="table">
  <tr>
    <th>Trails</th>
    <th>Province</th>
    <th>Country</th>
  </tr>
  <tr>
    <td class="tableRow">Lion's Head</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="1" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Pipe Track</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="2" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Skeleton Gorge</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="3" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Table Mountain</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="4" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">King Fisher Trail</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="5" button class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Robberg Peninsula</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="6" class="save">Save</button></td>
  </tr>
  <tr>
    <td class="tableRow">Diep Walle Forest Walk</td>
    <td class="tableRow">Western Cape</td>
    <td class="tableRow">South Africa<button button-id="7" class="save">Save</button></td>
  </tr>
</table>

Source https://stackoverflow.com/questions/71603646

QUESTION

How to paint a component on a JPanel?

Asked 2022-Mar-08 at 21:45

I have been learning Java from a YouTube tutorial and when it came to carrying components in a frame, things got a bit complicated for me. There are several things in this lesson for me, such as super keyword, Graphics class and paint method. I setup a frame and added this JPanel to that frame. I wrote this practice as much as I understood but it doesn't paint the ImageIcon and opens a completely empty frame instead. Thanks to anyone who can help in advance.

public class DragPanel extends JPanel{

ImageIcon image=new ImageIcon("walle.png");
Point imageCorner;
Point prevPt;

DragPanel(){
    imageCorner=new Point(0,0);
}

public void paintComponent(Graphics g){
    super.paintComponent(g);
    image.paintIcon(this, g, (int)imageCorner.getX(), (int)imageCorner.getY());
}
}

ANSWER

Answered 2022-Mar-08 at 21:45

ImageIcon("walle.png") is looking for the file relative to the location from which you executed the java command.

You can check what the "working" directory is by adding System.getProperty("user.dir") to your code. You can also check to see if the file exists from within the current context using System.getProperty(new File("walle.png").exists())

if that was the case it would cause a FileNotFoundException instead of printing null

Actually, ImageIcon doesn't throw an exception, it simply fails silently, which is why I tend to recommend not using it.

Instead, you should be using ImageIO, part from supporting more formats (and been expandable), it will also throw an exception if the image can't be loaded and won't return until the image is fully loaded.

See Reading/Loading an Image for more details

Forementioned PNG is in the same directory

Same directory as the class or the working directory? In general, I recommend getting use to using embedded resources, as it resolves many of the issues with "execution context"

I don't use an IDE

I'd probably recommend making use of one as it will help solve some of these issues and let you focus on learning the language.

So, my directory structure looks something like...

src/
    images/
        happy.png
    stackoverflow/
        Main.java

In this setup, the happy.png becomes an "embedded" resource, which will get packaged with the class files when it's exported, this means, that the resource is always in the same location, no matter the context of execution

package stackoverflow;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) {
        new Main();
    }

    public Main() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    JFrame frame = new JFrame();
                    frame.add(new TestPane());
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }

    public class TestPane extends JPanel {

        private BufferedImage image;

        public TestPane() throws IOException {
            image = ImageIO.read(getClass().getResource("/images/happy.png"));            
        }

        @Override
        public Dimension getPreferredSize() {
            return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (image == null) {
                return;
            }
            Graphics2D g2d = (Graphics2D) g.create();
            int x = (getWidth() - image.getWidth()) / 2;
            int y = (getHeight() - image.getHeight()) / 2;
            g2d.drawImage(image, x, y, this);
            g2d.dispose();
        }

    }
}

Source https://stackoverflow.com/questions/71399912

QUESTION

Gstreamer Android HW accelerated H.264 encoding

Asked 2022-Feb-15 at 18:10

I'm working on a robot that streams two camera streams using Gstreamer from a Jetson Nano over UDP to an Android device.

At this point, I'm taking one of the streams and trying to encode the video to display on an Android device. My Gstreamer pipeline looks like this:

rtspsrc location=rtsp://192.168.1.239:8554/test ! application/x-rtp, payload=96 ! rtph264depay ! amcviddec-omxexynosavcdec ! videoconvert ! autovideosink sync=false"

On the phone I'm using pre-built binaries of Gstreamer and have an implementation very similiar to this.

From MediaCodecList Android API, I've managed to find out, that my device has HW acceleration for OMX.Exynos.avc.dec so thats why I'm using it in that pipeline.

Now, when I run the app, the native lib gives me this error alongside with some more errors of the "same" type:

2022-02-15 12:25:13.570 6377-6377/cz.walle.wallecontroller E/GStreamer+ahc: 0:00:00.095861231 0x7589b71200 ../sys/androidmedia/gst-android-hardware-camera.c:1777:_init_classes Failed to initialize android.hardware.Camera classes: Failed to get static field ID EFFECT_EMBOSS (Ljava/lang/String;): java.lang.NoSuchFieldError: no "Ljava/lang/String;" field "EFFECT_EMBOSS" in class "Landroid/hardware/Camera$Parameters;" or its superclasses
    java.lang.NoSuchFieldError: no "Ljava/lang/String;" field "EFFECT_EMBOSS" in class "Landroid/hardware/Camera$Parameters;" or its superclasses
        at org.freedesktop.gstreamer.GStreamer.nativeInit(Native Method)
        at org.freedesktop.gstreamer.GStreamer.init(GStreamer.java:18)
        at cz.walle.wallecontroller.ControlActivity.onCreate(ControlActivity.java:41)
        at android.app.Activity.performCreate(Activity.java:8282)
        at android.app.Activity.performCreate(Activity.java:8262)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4005)
        at android.app.ActivityThread.ha
2022-02-15 12:25:13.570 6377-6377/cz.walle.wallecontroller E/GStreamer+ahs: 0:00:00.096544154 0x7589b71200 ../sys/androidmedia/gst-android-hardware-sensor.c:596:_init_classes Failed to initialize Android classes: Failed to call Java method: java.lang.ClassNotFoundException: Didn't find class "org/freedesktop/gstreamer/androidmedia/GstAhsCallback" on path: DexPathList[[zip file "/data/app/~~cU9DGdEFi5D9pOGi5u1pLw==/cz.walle.wallecontroller-nq-kqx36s-N7ImViW2Lwrw==/base.apk"],nativeLibraryDirectories=[/data/app/~~cU9DGdEFi5D9pOGi5u1pLw==/cz.walle.wallecontroller-nq-kqx36s-N7ImViW2Lwrw==/lib/arm64, /data/app/~~cU9DGdEFi5D9pOGi5u1pLw==/cz.walle.wallecontroller-nq-kqx36s-N7ImViW2Lwrw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/system_ext/lib64]]
    java.lang.ClassNotFoundException: Didn't find class "org/freedesktop/gstreamer/androidmedia/GstAhsCallback" on path: DexPathList[[zip file "/data/app/~~cU9DGdEFi5D9pOGi5u1pLw==/cz.walle.wallecontroller-nq-kqx36s-N7ImViW2Lwrw==/base.apk"],nativeLibraryDirectories=[/data/app/~~cU9DGdEFi5D9pOGi5u1pLw==/cz.walle.wallecontroller-nq-kqx36s-N7ImVi

The entire stacktrace is here.

Anyone has experience with this? When I try to use different encoder like avdec_h264 the stream works, but one CPU core can't keep up with encoding.

ANSWER

Answered 2022-Feb-15 at 18:10

You would use decodebin that would select the decoder according to a rank built into plugins. That should select the most efficient one available for decoding:

rtspsrc location=rtsp://192.168.1.239:8554/test latency=300 ! application/x-rtp,encoding-name=H264 ! decodebin ! autovideosink

Note that the optimal latency may not be acheived with the lowest value. It depends on stream-format and network available bandwidth. Just try various values running for quite long duration and see.

Source https://stackoverflow.com/questions/71125946

QUESTION

Loop through array contain objects and create different arrays from it

Asked 2022-Jan-07 at 23:26

I have this array of objects and I need to produce arrays from it to be that every array contains the [user name] and the sum of his [length] the length is time in seconds.

What's the best way for it?

Array
(
    [0] => stdClass Object
        (
            [length] => 4658
            [user_id] => 1922053
            [user_name] => Walled
        )

    [1] => stdClass Object
        (
            [length] => 5
            [user_id] => 1922053
            [user_name] => Walled
        )
    [2] => stdClass Object
        (
            [length] => 5555
            [user_id] => 19220
            [user_name] => Michael
        )

    [3] => stdClass Object
        (
            [length] => 2552
            [user_id] => 19220
            [user_name] => Michael
        )
)

ANSWER

Answered 2022-Jan-07 at 23:26

This will process the old array into a new one, It uses the user_id as the key of the new array so it can check if it is creating a new occurance or just adding the length to an existing occurance in the new array

$array = [
    (object)['length' => 4658, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5, 'user_id' => 1922053, 'user_name' => 'Walled'],
    (object)['length' => 5555, 'user_id' => 19220, 'user_name' => 'Michael'],
    (object)['length' => 2552, 'user_id' => 19220, 'user_name' => 'Michael']
];

$new = [];
foreach( $array as $a ) {
    if ( ! array_key_exists($a->user_id, $new) ) {
        $new[$a->user_id] = $a;    
    } else {
        echo $new[$a->user_id]->length . PHP_EOL;
        $new[$a->user_id]->length += $a->length;    
    }
    
}

print_r($new);

RESULT

Array
(
    [1922053] => stdClass Object
        (
            [length] => 4663
            [user_id] => 1922053
            [user_name] => Walled
        )
    [19220] => stdClass Object
        (
            [length] => 8107
            [user_id] => 19220
            [user_name] => Michael
        )
)

Source https://stackoverflow.com/questions/70628141

QUESTION

Bug in my recursive division algorithm (to generate maze randomly)

Asked 2021-Dec-11 at 16:09

I'm having trouble generating a random maze. My algorithm creates the initial box where the maze will be. But I cannot seem to generate any walls inside of this box. I'm trying to use the recursive division algorithm. Here is my code:

class Maze {
    constructor(COLS,ROWS) {
        this.width = COLS;
        this.height = ROWS;
        this.COLS = this.width*2+1; // *2 To account for blocks which are replaced by walls, 
        this.ROWS = this.height*2+1; // so the hollow blocks will be half of the total blocks, and there 
        //will be +1 wall (because the border of the maze will be a wall on either side on both x and y axies.)
        this.dimentions = [this.COLS, this.ROWS];
        this.maze = this.initArray([]);

        // This will palce the border walls (the ones on the outside of the maze)
        this.maze.forEach((currentRow, index) => {
            if(index === 0 || index === this.ROWS-1) {
                currentRow.forEach((_, cellIndex) => {
                    this.maze[index][cellIndex] = ["BLACK_WALL"];
                });
            } else {
                this.maze[index][0] = ["BLACK_WALL"];
                this.maze[index][currentRow.length-1] = ["BLACK_WALL"];
            }
        });

        // Now do the "recursive division" method to generate the maze
        const randomWallStart = [[2,2], [this.COLS-3, this.ROWS-3]][this.randInt(0,2)]; // Picks top left or bottom right
        const randomWallEnd = [[this.COLS-3, 2], [2, this.ROWS-3]][this.randInt(0,2)]; // Picks the other corner
        this.recursiveDivision(randomWallStart, randomWallEnd);
    }

    randInt(min, max) { // Used in random generation of maze
        return Math.floor(Math.random()*(max-min))+min;
    }

    initArray(value) {
        return new Array(this.ROWS).fill().map(() => new Array(this.COLS).fill(value));
    }

    recursiveDivision(wallStart, wallEnd, its=0) {
        this.maze[wallStart[1]][wallStart[0]] = ["FLAG1"];
        this.maze[wallEnd[1]][wallEnd[0]] = ["FLAG2"];
        const randXpoint = this.randInt(wallStart[0], wallEnd[0]); // Doesn't matter which way round the max and min are.
        const randYpoint = this.randInt(wallStart[1], wallEnd[1]);

        const directionToBuildWall = wallStart[0] === wallEnd[0] ? 0 : 1; // 0 = x-axis 1 = y-axis

        const newWallStart = [randXpoint, randYpoint];
        let forwardsOrBackwards = 1;
        if(newWallStart[directionToBuildWall] > this.dimentions[directionToBuildWall]/2) {
            forwardsOrBackwards = -1;
        }

        let currentPosition = newWallStart;
        currentPosition[directionToBuildWall] +=  forwardsOrBackwards * 1;

        while(this.maze[currentPosition[1]][currentPosition[0]] != "BLACK_WALL") {
            this.maze[currentPosition[1]][currentPosition[0]] = ["BLACK_WALL"];
            currentPosition[directionToBuildWall] += forwardsOrBackwards*1;
        }

        if(its > Math.min(this.COLS-2)) {
            return;
        }
        const beginningPos = currentPosition.slice();
        beginningPos[directionToBuildWall] = 1; 
        this.recursiveDivision(currentPosition,beginningPos,its+1);

    }

  posToSpace(x) {
    return 2 * (x-1) + 1;
  }

  posToWall(x) {
    return 2 * x;
  }

  inBounds(r, c) {
    if((typeof this.maze[r] == "undefined") || (typeof this.maze[r][c] == "undefined")) {
      return false; // out of bounds
    }
    return true;
  }

  isGap(...cells) {
    return cells.every((array) => {
      let row, col;
      [row, col] = array;
      if(this.maze[row][col].length > 0) {
        if(!this.maze[row][col].includes("door")) {
          return false;
        }
      }
      return true;
    });
  }

  countSteps(array, r, c, val, stop) {

    if(!this.inBounds(r, c)) {
      return false; // out of bounds
    }

    if(array[r][c] <= val) {
      return false; // shorter route already mapped
    }

    if(!this.isGap([r, c])) {
      return false; // not traversable
    }

    array[r][c] = val;

    if(this.maze[r][c].includes(stop)) {
      return true; // reached destination
    }

    this.countSteps(array, r-1, c, val+1, stop);
    this.countSteps(array, r, c+1, val+1, stop);
    this.countSteps(array, r+1, c, val+1, stop);
    this.countSteps(array, r, c-1, val+1, stop);
  }

  display() {
    this.parentDiv = document.getElementById("maze-container");
    while(this.parentDiv.firstChild) {
      this.parentDiv.removeChild(this.parentDiv.firstChild);
    }
    const container = document.createElement("div");
    container.id = "maze";
    container.dataset.steps = this.totalSteps;

    this.maze.forEach((row) => {
      let rowDiv = document.createElement("div");
      row.forEach((cell) => {
        let cellDiv = document.createElement("div");
        if(cell?.join) {
          cellDiv.className = cell.join("");
        }
        rowDiv.appendChild(cellDiv);
      });
      container.appendChild(rowDiv);
    });

    this.parentDiv.appendChild(container);

    return true;
  }
}

const myMaze = new Maze(5,5);
myMaze.display();

body, html {margin: 0;}
#maze-container {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

#maze {
  position: relative;
  background-color: #a7c53f;
  background-size: 8em 8em;
}
#maze div {
  display: flex;
}
#maze div div {
  position: relative;
  width: 1.2rem;
  height: 1.2rem;
}
#maze div div::after {
  position: absolute;
  left: -3px;
  top: -4px;
  text-align: center;
  text-shadow: 0 0 1px black;
  font-size: 1.2em;
  z-index: 10;
}
.FLAG1 {
    background-color: #a00;
}
.FLAG2 {
    background-color: #0a0;
}
#maze div div.BLACK_WALL, #maze div div.nubbin.BLACK_WALL, #maze div div.door.exit {
  background-color: #000;
  background-size: 0.5em 0.5em;
}
#maze div div.nubbin.BLACK_WALL::after {
  content: "";
}
#maze div div:nth-child(odd) {
  width: 1em;
}
#maze div:nth-child(odd) div {
  height: 1em;
}

<div id="maze-container"></div>

As you can see when you run the code, the walls are generated, but in the wrong places. So some touch each other (so you can't move between them) and I cannot solve this problem. I cannot get this "recursive division" algorithm to work properly.

ANSWER

Answered 2021-Dec-11 at 16:09

I see at least these issues in your code:

The wall is built at a random position without taking into account the odd/even division of your cells in potential-wall / not-wall cells (which is the reason why you had this.COLS = this.width*2+1 in the constructor). As a consequence your walls can end up adjacent to eachother, leaving no room for open cells. You should only place horizontal walls at even Y-coordinates, and vertical walls at even X-coordinates.
The door in the wall is always made at the extreme end of the wall, while the algorithm should make the gap in that wall randomly.
There is only one recursive call, which means the algorithm is not aware of the fact that a wall generally divides the room into two partitions, each of which should (generally) be further divided up through recursion. So you need two recursive calls instead of one.

If you correct those points it could work. However, I prefer a data structure where really each inner array element represents a cell, and the walls are inferred by properties of those cells. So, no cells will function as wall. Each cell then can track which are its neighbors (4 at the most). A wall can then be implemented by removing a neighbor from a cell (and doing the same in the reverse direction). The visualisation of a wall can then be done with border CSS styling.

Here is an implementation:

class Maze {
    static Cell = class {
        constructor(x, y, left, above) {
            this.x = x;
            this.y = y;
            this.neighbors = [left ?? null, above ?? null, null, null];
            // Also set link in opposite direction
            if (left) left.neighbors[2] = this;
            if (above) above.neighbors[3] = this;
        }
        
        block(direction) { 
            // Place a wall by clearing neighbor link
            if (this.neighbors[direction]) this.neighbors[direction][direction ^ 2] = null;
            this.neighbors[direction] = null;
        }
    }
    
    constructor(parent, numCols, numRows) {
        this.parentDiv = parent;
        
        let above = [];
        this.maze = Array.from({length: numRows}, (_, y) => {
            let left = null;
            return above = Array.from({length: numCols}, (_, x) => left = new Maze.Cell(x, y, left, above[x]));
        });
        this.recursiveDivision(0, 0, numCols, numRows);
    }


    recursiveDivision(left, top, right, bottom, its=0) {
        const randInt = (min, max) => Math.floor(Math.random() * (max - min)) + min;

        const width = right - left;
        const height = bottom - top;
        // Base case: cannot be divided further:
        if (width < 2 || height < 2) return; 
        let choice = randInt(0, (width - 1) + (height - 1));
        if (choice >= width - 1) { // Place horizontal wall
            const y = top + choice - (width - 2);
            const gap = randInt(left, right);
            for (let x = left; x < right; x++) {
                if (x != gap) this.maze[y][x].block(1);
            }
            this.recursiveDivision(left, top, right, y, its+1);
            this.recursiveDivision(left, y, right, bottom, its+1);
        } else { // Place vertical wall
            const x = left + choice + 1;
            const gap = randInt(top, bottom);
            for (let y = top; y < bottom; y++) {
                if (y != gap) this.maze[y][x].block(0);
            }
            this.recursiveDivision(left, top, x, bottom, its+1);
            this.recursiveDivision(x, top, right, bottom, its+1);
        }
    }

    display() {
        this.parentDiv.innerHTML = "";
        const container = document.createElement("div");
        container.className = "maze";
        for (const row of this.maze) {
            const rowDiv = document.createElement("div");
            for (const cell of row) {
                const cellDiv = document.createElement("div");
                cellDiv.className = ["left", "top", "right", "bottom"].filter((_, i) => !cell.neighbors[i]).join(" ");
                rowDiv.appendChild(cellDiv);
            }
            container.appendChild(rowDiv);
        }
        this.parentDiv.appendChild(container);
    }
}

const myMaze = new Maze(document.getElementById("maze-container"), 30, 10);
myMaze.display();

body, html { margin: 0 }
#maze-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.maze {
    position: relative;
    background-color: #a7c53f;
    background-size: 8em 8em;
}
.maze div {
    display: flex;
}
.maze div div {
    box-sizing: border-box;
    position: relative;
    width: 1.2rem;
    height: 1.2rem;
}
.left { border-left: 1px solid black }
.right { border-right: 1px solid black }
.top { border-top: 1px solid black }
.bottom { border-bottom: 1px solid black }

<div id="maze-container"></div>

Source https://stackoverflow.com/questions/70314900

QUESTION

How can i refactor these functions?

Asked 2021-Jul-09 at 21:21

So basically, in game, I have a "wall validator", which checks if wall meets all of the requirements. Then, based on which requirement have failed, program calls appropriate message function.

Here is the code, where I call wall validator:

    internal void PlaceWall(Vector2 wallStartPosition, Vector2 wallEndPosition)
    {
        _wallStartPosition = wallStartPosition;
        _wallEndPosition = wallEndPosition;

        _wallValidator.InitializeVectors(wallStartPosition, wallEndPosition);
        if (_wallValidator.WallDoesNotMeetTheRequirements())
        {
            _wallValidator.SendAppropriateMessage();
            return;
        }

        PlaceNewWall();
    }

Right now I check all requirements two times in two different functions here they are in wall validator:

    internal bool WallDoesNotMeetTheRequirements()
    {
        if (WallPositionIsBeyondBoard()||
            PlayerUsedAllAvailableWalls()||
            WallIsNotOnTheSameLine() ||
            WallIsTooLong() ||
            WallTilesHavePairCoordinates() ||
            WallDoesNotCoverTwoSolidTiles() ||
            WallInterceptsWithOtherWall())
            return true;

        return false;
    }

    internal void SendAppropriateMessage()
    {
        if (WallPositionIsBeyondBoard())
            _player.output?.DisplayWallHasPositionBeyondBoardMessage();
        if (PlayerUsedAllAvailableWalls())
            _player.output?.DisplayNotEnoughWallsMessage();
        if (WallIsNotOnTheSameLine())
            _player.output?.DisplayWallIsNotOnTheSameLineMessage();
        if (WallIsTooLong())
            _player.output?.DisplayWallIsTooLongMessage();
        if (WallTilesHavePairCoordinates())
            _player.output?.DisplayWallTilesHavePairCoordinatesMessage();
        if (WallDoesNotCoverTwoSolidTiles())
            _player.output?.DisplayWallDoesNotCoverTwoSolidTilesMessage();
        if (WallInterceptsWithOtherWall())
            _player.output?.DisplayWallInterceptsWithOtherWallMessage();
    }

How would you refactor these functions?
I've tried making a "Requirement" class, which accepts "check function" and "message to send" in it's constructor, but have failed. This option does not work in testing environment. The reason is that I am using NUnit testing framework, and when I tried to test wall placement without assigning "ConsoleOutput" (Class, which implements all of the message functions), I would always get a "NullPointer" exception at the point of "Requirement" class initialization.
So, basically, what Im trying to say in code is "Send appropriate message to the output if it is not null, but if it is, then just return true". But with every new requirement in current state, i would need to add check function in two different places.
I don't really like this option of "double checking requirement and sending message" and I feel like I'm missing a simple answer to this problem.
P.S. Sorry for my broken english ;D, hope I explained everything that I could in a way that you can understand.

ANSWER

Answered 2021-Jul-09 at 21:21

As mentioned in the comments, make a enum that returns the result of the operation, inclusive different error cases.

public enum WallPlacementResult{
    Success,
    NotOnTheSameLine,
    TooLong
    ...
}

WallPlacementResult CheckWallRequirements(){
      if (WallIsNotOnTheSameLine()) return WallPlacementResult.NotOnTheSameLine;
      if (WallIsTooLong()) return WallPlacementResult.TooLong;
      ...
    return WallPlacementResult.Success;
}

void SendAppropriateMessage(WallPlacementResult result)
{
    switch(result){
        case WallPlacementResult.NotOnTheSameLine:
             _player.output?.DisplayWallHasPositionBeyondBoardMessage();
        break;
        case WallPlacementResult.TooLong:
        ...
    }
}

Another option might be to use something like a generic result object. Overall I would recommend delegating any UI task, like showing messages, to the UI layer. The checking logic may benefit of being placed in a lower layer to make it easier to unit test etc.

Source https://stackoverflow.com/questions/68322620

QUESTION

Terraform filter based on map's minor key on lists of maps

Asked 2021-Jul-07 at 01:22

I have 2 list of maps. Allow me to show you. Let's call this one values_default:

 [{A="abc", B="10"}]

and new_config:

[
  {A="abc", B="9"},
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"},
]

Then I need merge or concat them, but in a special way. What I need to do is Filter out duplicates of A, taking the A who has the smallest value of B. That is the final result desired, maybe there is another way to do this from what I am attempting, but as long as I get those two inputs and the expected result, it's fine. For the example above it the result should be:

[
  {A="abc", B="9"},
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"},
]

Here we took the A with the lower B value. I did this so far:

locals {
  tmp_cluster_parameters = concat(var.new_config, var.values_default)
  final_cluster_parameters = distinct([for i in local.tmp_cluster_parameters: {
     name = i.A
     value = i.B
  }])
}

This means I can filter out ONLY when the maps are exactly the same (A & B). I tried many more things, but can not figure out how to get closer to my goal. for the example above, this would not filter out anything. The result would be this:

 [
  {A="abc", B="10"},
  {A="abc", B="9"},
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"}
 ]

Ideally it should have removed the {A="abc", B="10"}

Edit 1: answer to question from @macin. here is the actual field as is today and some further explanation

variable "cluster_parameters_default" {
  description = ""
  type = list(map(string))
  default = [
        {
            name = "wait_timeout"
            value = "800" 
        }
    ]
}

I will have a few default parameters in the future. Those are defaults for MySQL Parameter groups. Here cluster_parameters_default is values_default, name is A and value is B. The idea is to have some ENFORCEABLE MySQL config defaults that we can overwrite to a greater or smaller value depending on what is allowed. This defaults would create a permissible walled garden for many configs of many DBs. For instance security team might require for us to have wait_timeout smaller than 15 minutes. Now you we should also be able to have a different value always that this value is smaller than 15 minutes as required by the security team. Aside there will be many more values that come from new_config. I did not want to have to explain all this as this is part of a much bigger project. meaning it will be much more complicated. That is why values_default, A and B. I could change the FORMAT of this variable values_default as it's my own variable, but I can not change new_config as this is used by MANY other things outside my control.

Edit2: Other Data Sets(DSx).

DS1: values_default:

[{A="abc", B="10"}]

Then new_config:

[
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"},
]

desired output here should be:

[
  {A="abc", B="10"},
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"},
]

DS2:

values_default:

[
{A="abc", B="10"},
{A="cdea", B="111"},
]

Then new_config:

[
  {A="abc", B="8"},
  {A="cdea", B="1000"},
  {A="asd", B="otra cosa"},
]

The desired output in this case would be:

[
  {A="abc", B="8"},
  {A="cdea", B="111"},
  {A="asd", B="otra cosa"},
]

DS3:

values_default:

[
{A="abc", B="10"},
{A="cdea", B="111"},
]

Then new_config would be NOT DECLARED in this case.

The desired output in this case would be values_default:

[
{A="abc", B="10"},
{A="cdea", B="111"},
]

ANSWER

Answered 2021-Jul-07 at 00:29

Not sure I fully understand, but just based on your example, you can achieve your outcome using (p.s. min applies only to numbers, I don't know how you want to compare strings using min):



variable "values_default" {
  default = [
{A="abc", B="10"},
{A="cdea", B="111"},
]
}

# FOR CASE 3, but works for other cases as well
variable "new_config" {
    default = []
}


  locals {
  
    # get keys avaiable in our vars
    keys_default =   [for v in var.values_default: v.A]
    keys_new =   [for v in var.new_config: v.A]
    keys_all = distinct(concat(local.keys_default, local.keys_new))
    
    # find common keys that need to be potentailly overwritten
    # using min of B values
    keys_common = setintersection(local.keys_default, local.keys_new)

    # construct overwritten values, if there are any
    # keys must be unique in both vars (no duplicates present)
    overwritten_values = [ for idx, key in local.keys_common:
       {
              A = key
              B = min([for v in var.values_default: v.B if v.A == key][0], 
                      [for v in var.new_config: v.B if v.A == key][0])
       }
    ]
    
    keys_different = setsubtract(local.keys_all, local.keys_common) 

    new_values =  [ for idx, key in local.keys_different:
       {
              A = key
              B = concat([for v in var.values_default: v.B if v.A == key], 
                        [for v in var.new_config: v.B if v.A == key])
       }
    ]
}

output "test" {
 value = concat(local.overwritten_values, local.new_values)
}

gives:

test = [
  {
    "A" = "abc"
    "B" = [
      "10",
    ]
  },
  {
    "A" = "cdea"
    "B" = [
      "111",
    ]
  },
]

Source https://stackoverflow.com/questions/68266362

QUESTION

AccessException: Attempted To Read Or Write Protected/Corrupted Memory -- Known Exception, Unknown Reason?

Asked 2021-Jun-01 at 19:08

Yes, I know there's a million threads on this exception, I've probably looked at 20-25 of them, but none of the causes seem to correlate to this, sadly (hence the title, known exception, unknown reason).

I've recently been gaining interest in InfoSec. As my first learners-project, I'd create a basic DLL Injector. Seems to be going well so far, however, this exception is grinding me up, and after some relatively extensive research I'm quite puzzled. Oddly enough, the exception also rises after the function completely finishes.

I couldn't really figure this out myself since external debuggers wouldn't work with my target application, and that was a whole new unrelated issue.

Solutions suggested & attempted so far:

Fix/Remove thread status checking (it was wrong)
Ensure the value behind DllPath ptr is being allocated, not the ptr
Marshaling the C# interop parameters

Anyway, here is my hunk of code:

#pragma once

#include "pch.h"
#include "injection.h" // only specifies UserInject as an exportable proto. 

DWORD __stdcall UserInject(DWORD ProcessId, PCSTR DllPath, BOOL UseExtended) {
    DWORD length;
    CHAR* buffer;
    LPVOID memry;
    SIZE_T write;
    HANDLE hProc;
    HMODULE kr32;
    HANDLE thread;

    length = GetFullPathName(
        DllPath,
        NULL,
        NULL,
        NULL
    );
    AssertNonNull(length, INVALID_PATH);

    kr32 = GetModuleHandle("kernel32.dll");
    AssertNonNull(kr32, YOUREALLYMESSEDUP);

    buffer = new CHAR[length];

    GetFullPathName(
        DllPath,
        length,
        buffer,
        NULL
    );
    AssertNonNull(buffer, ERR_DEAD_BUFFER);

    hProc = OpenProcess(
        ADMIN,
        FALSE,
        ProcessId
    );
    AssertNonNull(hProc, INVALID_PROCID);

    memry = VirtualAllocEx(
        hProc,
        nullptr,
        sizeof buffer,
        SHELLCODE_ALLOCATION,
        PAGE_EXECUTE_READWRITE
    );
    AssertNonNull(memry, INVALID_BUFSIZE);

    WriteProcessMemory(
        hProc,
        memry,
        DllPath,
        sizeof DllPath,
        &write
    );
    AssertNonNull(write, ERR_SOLID_BUFFER);

    auto decidePrototype = [](BOOL UseExtended, HMODULE kr32) -> decltype(auto) {
        LPVOID procAddress; 

        if (!UseExtended) {
            procAddress = (LPVOID)GetProcAddress(kr32, LOADLIB_ORD);
        }
        else {
            procAddress = (LPVOID)GetProcAddress(kr32, LOADLIBX_ORD);
        };

        return (LPTHREAD_START_ROUTINE)procAddress;
    };

    auto loadLibraryAddress = decidePrototype(UseExtended, kr32);

    thread = CreateRemoteThread(
        hProc,
        NULL,
        NULL,
        loadLibraryAddress,
        memry,
        NULL,
        NULL
    );
    AssertNonNull(thread, INVALID_ROUTINE);

    WaitForSingleObject(thread, INFINITE);

    // The status stuff is quite weird; it was an attempt at debugging. The error occurs with or without this code.
    // I left it because 50% of the comments below wouldn't make sense. Just be assured this code is positively *not* the problem (sadly). 
    // LPDWORD status = (LPDWORD)1;
    // GetExitCodeThread(thread, status);

    return TRUE // *status;
}

One obscure macro would be "ADMIN" which expands to "PROCESS_ALL_ACCESS", shortened to fit in better. Another is "AssertNonNull":

#define AssertNonNull(o, p)      if (o == NULL) return p;

I've given a shot at debugging this code, but it doesn't halt at any specific point. I've thrown MessageBox tests past each operation (e.g allocation, writing) in addition to the integrity checks and didn't get any interesting responses.

I'm sorry I can't really add much extensive detail, but I'm really stone-walled here, not sure what to do, what information to get, or if there's anything to get. In short, I'm just not sure what to look for.

This is also being called from C#, 1% pseudocode.

[DllImport(path, CallingConvention = CallingConvention.StdCall)]
static extern int UserInject(uint ProcId, string DllPath, bool UseExtended);

uint validProcId;    // integrity tested 
string validDllPath; // integrity tested

UserInject(validProcId, validDllPath, true);

If you're interested in my testing application (for reproduction)

#include <iostream>
#include <Windows.h>

static const std::string toPrint = "Hello, World!\n";

int main() 
{
    while (true) 
    {
        Sleep(1000);

        std::cout << toPrint;
    }
}

ANSWER

Answered 2021-Jun-01 at 19:08

To my surprise, this wasn't as much an issue with the code as much as it was with the testing application.

The basic injection technique I used is prevented by various exploit protections & security mitigations that Visual Studio 2010+ applies to any applications built in release mode.

If I build my testing application in debug mode, there is no exception. If I use a non-VS built application, there is no exception.

I still need to fix how I create my threads, because no thread is created, but I've figured this out, that should be easy enough.

Source https://stackoverflow.com/questions/67782057

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