Dart Requires Chilkat v11.7.0+

QR Codes for Email, Phone, SMS and Location

See more QR Code Examples

Demonstrates QR codes that start an action on a phone. A QR code only holds text, and what happens on scanning depends on the form of that text: mailto: starts an email, tel: dials a number, SMSTO: starts a text message, and geo: opens a map at a latitude and longitude. A web address opens in the browser. 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 fmt = CkFormats();
  final json = CkJsonObject();
  final jsonOut = CkJsonObject();
  json.updateInt('render.moduleSize', 6);
  json.updateBool('output.overwrite', true);
  json.updateString('output.return', 'none');

  // An email, with the address and optionally a subject.  Spaces in the subject are written %20.
  json.updateString('payload.text', 'mailto:support@example.com?subject=Order%2012345');
  json.updateString('output.path', 'qa_output/qr_email.png');
  try {
    fmt.qrCode('generate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('email: version ${jsonOut.intOf('symbols[0].selectedEncoding.version')}, ${jsonOut.stringOf('outputs[0].path')}');

  // 

  // A phone number to dial, in international form.
  json.updateString('payload.text', 'tel:+15555550100');
  json.updateString('output.path', 'qa_output/qr_phone.png');
  try {
    fmt.qrCode('generate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('phone: version ${jsonOut.intOf('symbols[0].selectedEncoding.version')}, ${jsonOut.stringOf('outputs[0].path')}');

  // 

  // A text message: the number, then the message.
  json.updateString('payload.text', 'SMSTO:+15555550100:Please call me back');
  json.updateString('output.path', 'qa_output/qr_sms.png');
  try {
    fmt.qrCode('generate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('sms: version ${jsonOut.intOf('symbols[0].selectedEncoding.version')}, ${jsonOut.stringOf('outputs[0].path')}');

  // 

  // A location: latitude, then longitude, in degrees.
  json.updateString('payload.text', 'geo:41.8781,-87.6298');
  json.updateString('output.path', 'qa_output/qr_location.png');
  try {
    fmt.qrCode('generate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('location: version ${jsonOut.intOf('symbols[0].selectedEncoding.version')}, ${jsonOut.stringOf('outputs[0].path')}');

  // 

  // Sample output:

  // email: version 4, qa_output/qr_email.png
  // phone: version 2, qa_output/qr_phone.png
  // sms: version 3, qa_output/qr_sms.png
  // location: version 2, qa_output/qr_location.png
}