Dart Requires Chilkat v11.7.0+

Generate a QR Code as SVG

See more QR Code Examples

Demonstrates SVG output. An SVG is a vector image, so it stays sharp at any size, which suits print and responsive web pages. Setting output.format to svg and output.return to text returns the SVG document as a string in outputs[0].text. The SVG can also be written straight to a file with output.path, the same as a PNG. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final json = CkJsonObject();
  json.updateString('payload.text', 'https://www.chilkatsoft.com/');
  json.updateString('output.format', 'svg');

  // An SVG is text, so it can be returned as text rather than as base64.
  json.updateString('output.return', 'text');

  final fmt = CkFormats();
  final jsonOut = CkJsonObject();
  try {
    fmt.qrCode('generate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final sbSvg = CkStringBuilder();
  jsonOut.stringOfSb('outputs[0].text', sbSvg);

  print('MIME type: ${jsonOut.stringOf('outputs[0].mimeType')}');
  print('size: ${jsonOut.intOf('outputs[0].width')} x ${jsonOut.intOf('outputs[0].height')} ${jsonOut.stringOf('outputs[0].units')}');
  print('SVG length: ${sbSvg.length} characters');

  // The SVG is a complete document that can be saved, or placed inline in an HTML page.
  try {
    sbSvg.writeFile('qa_output/qr_chilkat.svg', 'utf-8', false);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The SVG:

  // 

  // Sample output:

  // MIME type: image/svg+xml
  // size: 148 x 148 px
  // SVG length: 12500 characters
}