127 lines
6.9 KiB
Markdown
127 lines
6.9 KiB
Markdown
[<img align="right" src="https://raw.github.com/wiki/zxing/zxing/zxing-logo.png"/>][1]
|
|
|
|
# ZXing
|
|
|
|
## Project in Maintenance Mode Only
|
|
|
|
The project is in maintenance mode, meaning, changes are driven by contributed patches.
|
|
Only bug fixes and minor enhancements will be considered. The Barcode Scanner app can
|
|
no longer be published, so it's unlikely any changes will be accepted for it.
|
|
There is otherwise no active development or roadmap for this project. It is "DIY".
|
|
|
|
### Runs on your favorite ECMAScript ecosystem
|
|
|
|
> If it doesn't, we gonna make it.
|
|
|
|
## What is ZXing?
|
|
|
|
> [ZXing][1] ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.
|
|
|
|
## Supported Formats
|
|
|
|
> See [Projects](https://github.com/zxing-js/library/projects) and [Milestones](https://github.com/zxing-js/library/milestones) for what is currently done and what's planned next. 👀
|
|
|
|
| 1D product | 1D industrial | 2D |
|
|
| ---------- |--------------------------------------|--------------|
|
|
| UPC-A | Code 39 | QR Code |
|
|
| UPC-E | Code 93 | Data Matrix |
|
|
| EAN-8 | Code 128 | Aztec |
|
|
| EAN-13 | Codabar | PDF 417 |
|
|
| | ITF | ~~MaxiCode~~ |
|
|
| | RSS-14 | |
|
|
| | RSS-Expanded (not production ready!) | |
|
|
|
|
|
|
## Status
|
|
|
|
[](https://npmjs.org/package/@zxing/ngx-scanner)
|
|
[](https://greenkeeper.io/)
|
|
|
|
[][0]
|
|
[][0]
|
|
[](https://github.com/zxing-js/library/graphs/contributors)
|
|
[](https://github.com/zxing-js/library/compare/master...develop)
|
|
|
|
[](https://codeclimate.com/github/zxing-js/library/maintainability)
|
|
[](https://codeclimate.com/github/zxing-js/library/test_coverage)
|
|
|
|
### Attention
|
|
|
|
>NOTE: While we do not have the time to actively maintain zxing-js anymore, we are open to new maintainers taking the lead.
|
|
|
|
## Demo
|
|
|
|
See [Live Preview](https://zxing-js.github.io/library/) in browser.
|
|
|
|
**Note:** All the examples are using ES6, be sure is supported in your browser or modify as needed, Chrome recommended.
|
|
|
|
## Installation
|
|
|
|
`npm i @zxing/library --save`
|
|
|
|
or
|
|
|
|
`yarn add @zxing/library`
|
|
|
|
## Limitations
|
|
|
|
On iOS-Devices **with iOS < 14.3** camera access works only in native Safari and not in other Browsers (Chrome,...) or Apps that use an UIWebView or WKWebView. This is not a restriction of this library but of the limited WebRTC support by Apple. The behavior might change in iOS 11.3 (Apr 2018?, not tested) as stated [here](https://developer.apple.com/library/content/releasenotes/General/WhatsNewInSafari/Articles/Safari_11_1.html#//apple_ref/doc/uid/TP40014305-CH14-SW1)
|
|
|
|
> iOS 14.3 (released in december 2020) now supports WebRTC in 3rd party browsers as well 🎉
|
|
|
|
### Browser Support
|
|
|
|
The browser layer is using the [MediaDevices](https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices) web API which is not supported by older browsers.
|
|
|
|
_You can use external polyfills like [WebRTC adapter](https://github.com/webrtc/adapter) to increase browser compatibility._
|
|
|
|
Also, note that the library is using the [`TypedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray) (`Int32Array`, `Uint8ClampedArray`, etc.) which are not available in older browsers (e.g. Android 4 default browser).
|
|
|
|
_You can use [core-js](https://github.com/zloirock/core-js) to add support to these browsers._
|
|
|
|
In the PDF 417 decoder recent addition, the library now makes use of the new `BigInt` type, which [is not supported by all browsers][2] as well. There's no way to polyfill that and ponyfill libraries are **way to big**, but even if PDF 417 decoding relies on `BigInt` the rest of the library shall work ok in browsers that doesn't support it.
|
|
|
|
_There's no polyfills for `BigInt` in the way it's coded in here._
|
|
|
|
## Usage
|
|
|
|
```javascript
|
|
// use with commonJS
|
|
const { MultiFormatReader, BarcodeFormat } = require('@zxing/library');
|
|
// or with ES6 modules
|
|
import { MultiFormatReader, BarcodeFormat } from '@zxing/library';
|
|
|
|
const hints = new Map();
|
|
const formats = [BarcodeFormat.QR_CODE, BarcodeFormat.DATA_MATRIX/*, ...*/];
|
|
|
|
hints.set(DecodeHintType.POSSIBLE_FORMATS, formats);
|
|
|
|
const reader = new MultiFormatReader();
|
|
|
|
const luminanceSource = new RGBLuminanceSource(imgByteArray, imgWidth, imgHeight);
|
|
const binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));
|
|
|
|
reader.decode(binaryBitmap, hints);
|
|
```
|
|
|
|
## Contributing
|
|
|
|
See [Contributing Guide](https://github.com/zxing-js/library/blob/master/CONTRIBUTING.md) for information regarding porting approach and reasoning behind some of the approaches taken.
|
|
|
|
## Contributors
|
|
|
|
Special thanks to all the contributors who have contributed for this project. We heartly thankful to you all.
|
|
|
|
[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/0)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/1)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/2)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/3)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/4)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/5)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/6)[](https://sourcerer.io/fame/odahcam/zxing-js/library/links/7)
|
|
|
|
And a special thanks to [@aleris][3] who created the project itself and made available the initial QR code port.
|
|
|
|
---
|
|
|
|
[](http://lunagao.github.io/BlessYourCodeTag/)
|
|
|
|
[0]: https://www.npmjs.com/package/@zxing/library
|
|
[1]: https://github.com/zxing/zxing
|
|
[2]: https://caniuse.com/#feat=bigint
|
|
[3]: https://github.com/aleris
|