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Description:

zxing2

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.

Getting started #
QR Code #
Decoding
The QRCodeReader class takes a list of bytes and returns the decoded barcode.
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);
}
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Encoding
The QRCodeReader class takes a list of bytes and returns the decoded barcode.
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);
}
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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.