jsQR | pure javascript QR code reading library. This library takes | QRCode Processing library
kandi X-RAY | jsQR Summary
kandi X-RAY | jsQR Summary
A pure javascript QR code reading library. This library takes in raw images and will locate, extract and parse any QR code found within.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of jsQR
jsQR Key Features
jsQR Examples and Code Snippets
Lines of Code : 45License : Permissive (BSD-3-Clause)
Copyimport {Decoder} from 'qram';
// user selected reader
import jsQR from 'jsqr';
// for converting text to binary data
import * as base64url from 'base64url-universal';
const decoder = new Decoder();
// get a video element to read images of qr-codes import React, { Component } from "react";
import jsQR from "jsqr";
class WebcamStream extends Component {
constructor(props) {
super(props);
this.state = {
isVideoLoading: true
};
this.videoTag = React.createRef(use jsqr,jimp we can decode the qr image and we will get data after that one we will compare the db and decoder data....
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npm i jimp, jsqr
cCommunity Discussions
Trending Discussions on jsQR
QUESTION
I'm using the upng-js module to read png files. In common sense the return value should be in RGBA form, so should be an Unit8Array with size 4*width*height. However when I'm reading an image with size 111*111 it returns an Unit8Array with size 49395. Here's my code:
ANSWER
Answered 2021-Oct-26 at 02:28At first, let's convert your image to RGBA8 format, then create a Uint8ClampedArray - Input of jsQR.
QUESTION
I have a JavaScript script that I am getting an error for that I can't figure out. I am trying to take a picture of the webcam feed using JavaScript
The error is:
Uncaught TypeError: webcam.snap is not a function
I am using webcam.js to take the snapshot.
Here is my JavaScript code:
...ANSWER
Answered 2021-Jul-11 at 15:38It seems like either:
- the webcam's code are missing (not imported)
- in this case you need to first call the script from the URL and add it with
scripttag
- in this case you need to first call the script from the URL and add it with
QUESTION
I am writing the code to accept QR-code image and decode into string.
The image will be static files in the folder 'public' of Nextjs.
In my code, I have convert my image into 'imageData'. I successfully convert and get 'imageData' object that return with A Uint8ClampedArray.
Then, I use this npm library to do javascript QR reader. https://www.npmjs.com/package/jsqr
But, somehow it give me this error back to me.
Unhandled Runtime Error TypeError: Cannot read property 'length' of undefined
This is error show in my localhost:3000
This in when I look in my code editor. I have highlight in line 372.
Although, I think that line 372 in part of the .next library and I should not have to do anything to it.
May be it is my code then.
This my code.
index.js
...ANSWER
Answered 2021-Jul-02 at 19:30You get undefined error because you call the jsqr function before the onload callback where you define imageDataT. You need to wrap the code inside the callback.
QUESTION
I want to open a camera scanner and below is code that working properly in android but in ios getting an error
TypeError: undefined is not an object (evalution 'navigation.mediaDevices.getUserMedia')
here is the full tutorial links https://devdactic.com/pwa-qr-scanner-ionic/ A small help is much appreciated
...ANSWER
Answered 2020-Jul-14 at 11:50getUserMedia is not available on WKWebView, which Capacitor uses. So you won't be able to use it unless Apple makes getUserMedia available in the future.
QUESTION
Recently i moved my angular application in some different folder. since then when i want to build the app i get this error:
Schema validation failed with the following errors: Data path "" should have required property 'tsConfig'
I tried to look up in github and stackoverflow and only found these links:
https://github.com/angular/angular-cli/issues/11479
they say i have to downgrade a package:
"@angular-devkit/build-angular": "^0.800.1" to "^0.12.4"
but this don't feel like the right way
...ANSWER
Answered 2020-Apr-01 at 14:27Check your angular.json file
Maybe the tsconfig.json path is missing in the build configuration
QUESTION
I am trying to implement the jsQR javascript library from git: jsQR
I am testing on Safari 13.0.4 and when i run their demo found on their webpage it runs with no problems.
Now when i implement the same exact code (copy&paste) from the demo's inspector to my page i get the message TypeError: undefined is not an object (evaluating 'navigator.mediaDevices.getUserMedia') which after some console printing the actual undefined object is navigator.mediaDevices this is strange since their demo is working i do not think it is a browser issue.
Additionally i run my page on firefox and it works perfectly fine.
What might be the problem?
Here is the code i have (it is the exact as demo anyway):
Javascript:
...ANSWER
Answered 2020-Jan-17 at 16:54Solved it. The development server is not secure and thus safari does not allow the use of WebRTC on insecure connections.
To allow the use (on safari at least) you have to go to Develop>WebRTC>Allow media capture on insecure sites.
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