qr | Simple QR Code Generator written in C | QRCode Processing library

by bjguillot C Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | qr Summary

qr is a C library typically used in Utilities, QRCode Processing applications. qr has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Simple QR Code Generator written in C without any third-party library dependencies. I wanted to learn more about QR codes and figure out how to generate them from scratch. From scratch meaning, without having to use any third party libraries. Not even a PNG graphics library. I decided to use C for the language to be as bare-bones as possible so that I would later be able to easily code it in assembly language on retrocomputers.

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Support

qr has a low active ecosystem.

It has 9 star(s) with 6 fork(s). There are 2 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 1 have been closed. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of qr is current.

Quality

qr has no bugs reported.

Security

qr has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

qr is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

qr releases are not available. You will need to build from source code and install.

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qr Key Features

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qr Examples and Code Snippets

No Code Snippets are available at this moment for qr.

Community Discussions

Trending Discussions on qr

Python: If Formula Not Working on Dataframe | ValueError: The truth value of a DataFrame is ambiguous

Python tkinter - How to reload label's image every second?

ReactJS update UI or call method from different class

Issue with scanning QR codes using flutter

Vertx event bus and encoding issues when encoding/decoding string to Kotlin ByteArray

How to transfer data(QR Code) from system to Paytm Dynamic QR device

numpy's fromfunction accessing arrays in the input function

Change position of number of bar (ggplot) with negative and positive values

How to get data's property value after axios.get call?

App crashing when i try to change activity Intent

QUESTION

Python: If Formula Not Working on Dataframe | ValueError: The truth value of a DataFrame is ambiguous

Asked 2021-Jun-15 at 23:10

I have a dataframe with different currencies.
I'm creating an if formula to apply to a specific column and give me the results in another column:

Code:

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ANSWER

Answered 2021-Jun-15 at 22:47

If you are hoping to get True if the result is not empty, you might want to use:

Source https://stackoverflow.com/questions/67994130

QUESTION

Python tkinter - How to reload label's image every second?

Asked 2021-Jun-14 at 21:36

I have an image (QR image) that i have to display it, and keep refreshing it every time. I tried many solutions but none worked, this is my code:

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ANSWER

Answered 2021-Jun-14 at 21:36

You have to keep a reference to the PhotoImage instance first, which you are not:

Source https://stackoverflow.com/questions/67932403

QUESTION

ReactJS update UI or call method from different class

Asked 2021-Jun-13 at 00:32

I have two classes, App and qrCode. The qrCode class returns a image of the qrcode based on the address provided in that classes state. The app class displays the qrcode component. In the method getSessionID, the app makes a request to the server, then should call updateQrCode to update the qrcode that is being shown.

How can I call the method updateQrCode from App.js? I can't instantiate a new QrCode, because that is not the instance that is being displayed.

App.js:

...

ANSWER

Answered 2021-Jun-13 at 00:30

App.js is the parent component and QrCode.js is the child component. From parent to child you can pass by props directly.

In App.js, create a state object and update it on receiving fetch response. React re-renders component and its children whenever state object changes.

App.js

Source https://stackoverflow.com/questions/67953919

QUESTION

Issue with scanning QR codes using flutter

Asked 2021-Jun-12 at 00:25

Hi I'm trying to read a QR code and send the data in the QR code to my server. But when running flutter build ios I get the error in xcode when launching the app:

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ANSWER

Answered 2021-Jun-12 at 00:25

This is happening because you are calling setState before your widget has fully initialized itself. You can't call set state before the build method has finished because there is nothing to set the state of.

When you do a hot restart the phone (or emulator) keeps the state of the page or widget and rebuilds the ui. At that point, the build method of the widget gets called again and because your set state is in your build method, it is also getting called again, but this time on a state that was already initialized.

As a side note: Please post the relevant code instead of a link to your github repo. It helps you get better answers and it makes this a more useful question/ answer to the community

Edit: Here is the block of code causing problems.

Source https://stackoverflow.com/questions/67944287

QUESTION

Vertx event bus and encoding issues when encoding/decoding string to Kotlin ByteArray

Asked 2021-Jun-11 at 20:53

I'm using Kotlin and vertx. In my vertx app, I'm trying to send a ByteArray to another event consumer.

To do this i'm converting it to a string, and then once its received in the 2nd handler I'm converting it back to a ByteArray but the objects aren't equal. They are very different and I have no idea why.

My 2 event handlers are:

...

ANSWER

Answered 2021-Jun-11 at 20:53

If you aren't using clustered Vert.x, you can just send and receive ByteArray.

You may need to implement a no-op codec, though: https://alexey-soshin.medium.com/understanding-vert-x-event-bus-c31759757ce8

Source https://stackoverflow.com/questions/67940330

QUESTION

How to transfer data(QR Code) from system to Paytm Dynamic QR device

Asked 2021-Jun-11 at 14:43

As we know, Paytm has launched a Dynamic QR device to display invoice/bill QR Code image.

I have to integrate this device with a billing system(POS), where I have to send QRCode data to this device.

I have to integrate it using C#.NET

Note:- As per the device guidelines, we can transfer data from system to device using USB Port(the serial port communication) Reference

...

ANSWER

Answered 2021-Apr-10 at 06:39

I got the solution after a discussion with Paytm Development Team. They have shared an SDK along with an API that is used to transfer data from POS(PC) to the Paytm Dynamic QR display device.

This SKD has basically main three methods:

Show Home Screen on display
Show QRCode on display
Show Payment Success message on display

Source https://stackoverflow.com/questions/66649004

QUESTION

numpy's fromfunction accessing arrays in the input function

Asked 2021-Jun-10 at 07:48

I am trying to create a numpy matrix with each matrix element as output element of a function, using numpy's fromfunction. Below is my code and it fails with an error message IndexError: arrays used as indices must be of integer (or boolean) type. I read some resources on Stackoverflow which said that the documentation is misleading (Parameters to numpy's fromfunction) and it sometimes doesn't work as expected. After reading these threads, I suspect that the problem is that I access two arrays, q_x and rs in the input function. Any idea on how to get rid of the error?

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ANSWER

Answered 2021-Jun-10 at 07:28

The link that you attached already addressed the problem perfectly. Could you elaborate on the case that it doesn't work?

So the problem here is that np.fromfunction is handing over the whole meshgrid instead of a single index.

Source https://stackoverflow.com/questions/67916434

QUESTION

Change position of number of bar (ggplot) with negative and positive values

Asked 2021-Jun-09 at 10:49

I have the next code, where I have negative positive and negative values and I want to put the positive values above the edge of bar, and negative values below the edge of the bar. I want to know too how to change the y axes (limites), changes the order of "Flujo" and how to change background graph.

...

ANSWER

Answered 2021-Jun-09 at 10:49

Here is one way you could do: I changed geom_bar with geom_col anc put an ifelse in geom_text(). Here you can define the position 0,-1,1.5` of the numbers.

Source https://stackoverflow.com/questions/67900471

QUESTION

How to get data's property value after axios.get call?

Asked 2021-Jun-07 at 09:54

It's Vue.js app and the code looks as following:

...

ANSWER

Answered 2021-Jun-07 at 09:54

The screenshot shows you that responseUrl is an object with result and data properties. I believe it is the successful promise. By adding a .then(response => response.json()), you will have the data by itself as a JSON object.

Refactor the code as follows :-

Source https://stackoverflow.com/questions/67869422

QUESTION

App crashing when i try to change activity Intent

Asked 2021-Jun-07 at 07:23

I've been trying to fix this for weeks but failed, when I click on login (indicated with the id "lin") to open a new activity the app crash, i don't know if it's a problem with the Intent or something else, here is the code. The manifest should be ok so I think it's a problem in the MainActivity with Intent ab. The other activity is called Qrcode. I tried to change appcompatactivty to activity but didn't work, i don't really know what to do.

Edit: I posted the code of the qrcode activity, i got it from the answers of this question : Android, How to read QR code in my application?, only for educational purpose of course.

Edit 2: logcat posted, sorry for any issues with asking this question, it's the first question i ask here.

Logcat

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ANSWER

Answered 2021-Jun-03 at 17:42

ur code in MainActivity seems ok and I think don't have any problem. In my opinion your Qrcode Activity has some bugs in it, like onCreate method, you should see the Logcat logs in android Studio, btw u can attach the Qrcode activity codes here, it is really helpful. another way to find the bug is by using the try-catch in your code and log the exception

Source https://stackoverflow.com/questions/67826053

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Vulnerabilities

No vulnerabilities reported

Install qr

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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