Dart Requires Chilkat v11.7.0+

Create a vCard (Contact) QR Code

See more QR Code Examples

Demonstrates a QR code that adds a contact to a phone when scanned. The text is a vCard, the standard format for contact details: lines between BEGIN:VCARD and END:VCARD, each ending with CRLF. A vCard is fairly long, so the symbol is larger than one holding a web address. Leave out the fields that are not needed to keep it small. 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.

  // The second argument of AppendLine is cktrue to end each line with CRLF.
  final sbCard = CkStringBuilder();
  sbCard.appendLine('BEGIN:VCARD', true);
  sbCard.appendLine('VERSION:3.0', true);
  sbCard.appendLine('N:Smith;Alex;;;', true);
  sbCard.appendLine('FN:Alex Smith', true);
  sbCard.appendLine('ORG:Example Company', true);
  sbCard.appendLine('TITLE:Sales Manager', true);
  sbCard.appendLine('TEL;TYPE=CELL:+1-555-0100', true);
  sbCard.appendLine('EMAIL:alex.smith@example.com', true);
  sbCard.appendLine('URL:https://www.example.com', true);
  sbCard.appendLine('END:VCARD', true);

  final json = CkJsonObject();
  json.updateSb('payload.text', sbCard);
  json.updateInt('render.moduleSize', 6);
  json.updateString('output.path', 'qa_output/qr_vcard.png');
  json.updateBool('output.overwrite', true);
  json.updateString('output.return', 'none');

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

  print('vCard length: ${sbCard.length}');
  print('QR version: ${jsonOut.intOf('symbols[0].selectedEncoding.version')}');
  print('modules: ${jsonOut.intOf('symbols[0].dimensions.modulesWide')} x ${jsonOut.intOf('symbols[0].dimensions.modulesHigh')}');
  print('image: ${jsonOut.intOf('outputs[0].width')} x ${jsonOut.intOf('outputs[0].height')} pixels');

  // The image written to qa_output/qr_vcard.png:

  // 

  // Sample output:

  // vCard length: 197
  // QR version: 10
  // modules: 57 x 57
  // image: 390 x 390 pixels
}