https://github.com/xvrh/zxing-dart

This package is a pure Dart port of the ZXing ("zebra crossing") Java library.
https://github.com/xvrh/zxing-dart

barcode dart dartlang zxing

Last synced: 3 months ago
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This package is a pure Dart port of the ZXing ("zebra crossing") Java library.

• Host: GitHub
• URL: https://github.com/xvrh/zxing-dart
• Owner: xvrh
• License: bsd-3-clause
• Created: 2021-02-16T11:36:41.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2024-04-03T07:58:32.000Z (10 months ago)
• Last Synced: 2024-06-19T05:54:45.914Z (7 months ago)
• Topics: barcode, dart, dartlang, zxing
• Language: Dart
• Homepage:
• Size: 123 MB
• Stars: 26
• Watchers: 3
• Forks: 7
• Open Issues: 8
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# zxing-dart

ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library.  

This package is a pure Dart port of the original Java library.

For now, it only supports **QR-Code** (encoding and decoding). New format can easily be added if this port proves useful.

[![pub package](https://img.shields.io/pub/v/zxing2.svg)](https://pub.dartlang.org/packages/zxing2)

[![Build Status](https://github.com/xvrh/zxing-dart/workflows/Build/badge.svg?branch=master)](https://github.com/xvrh/zxing-dart)

[![codecov](https://codecov.io/gh/xvrh/zxing-dart/graph/badge.svg?token=UGGAJMNLBC)](https://codecov.io/gh/xvrh/zxing-dart)



## Getting started

### QR Code

#### Decoding

The `QRCodeReader` class takes a list of bytes and returns the decoded barcode.

```dart

import 'dart:io';

import 'package:image/image.dart' as img;

import 'package:zxing2/qrcode.dart';

void main() {

  var image = img.decodePng(File('tool/example.png').readAsBytesSync())!;

  LuminanceSource source = RGBLuminanceSource(

      image.width,

      image.height,

      image

          .convert(numChannels: 4)

          .getBytes(order: img.ChannelOrder.abgr)

          .buffer

          .asInt32List());

  var bitmap = BinaryBitmap(GlobalHistogramBinarizer(source));

  var reader = QRCodeReader();

  var result = reader.decode(bitmap);

  print(result.text);

}

```

#### Encoding

The `QRCodeReader` class takes a list of bytes and returns the decoded barcode.

```dart

import 'dart:io';

import 'package:image/image.dart' as img;

import 'package:zxing2/qrcode.dart';

void main() {

  var qrcode = Encoder.encode('ABCDEF', ErrorCorrectionLevel.h);

  var matrix = qrcode.matrix!;

  var scale = 4;

  var image = img.Image(

      width: matrix.width * scale,

      height: matrix.height * scale,

      numChannels: 4);

  for (var x = 0; x < matrix.width; x++) {

    for (var y = 0; y < matrix.height; y++) {

      if (matrix.get(x, y) == 1) {

        img.fillRect(image,

            x1: x * scale,

            y1: y * scale,

            x2: x * scale + scale,

            y2: y * scale + scale,

            color: img.ColorRgba8(0, 0, 0, 0xFF));

      }

    }

  }

  var pngBytes = img.encodePng(image);

  File('tool/examples/encoded.png').writeAsBytes(pngBytes);

}

```

## Flutter

The `example` folder contains a full example that uses the official camera plugin connected to this

package to decode barcode from the bytes stream.