Dart Requires Chilkat v11.7.0+

Validate a QR Code Request

See more QR Code Examples

Demonstrates the validate operation, which examines a request without producing anything. The scope says how far to look: definition checks the options, capacity also checks that the data fits a QR symbol, and layout also checks the rendered size against the limits. The response has a validationStatus of valid or invalid, a list of checks, and findings[] describing what is wrong. A request that cannot be understood at all, such as one with a misspelled option, still makes the call fail in the usual way. 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 jsonOut = CkJsonObject();
  var n = 0;

  final json = CkJsonObject();
  json.updateString('target', 'symbol');
  json.updateString('validation.scope', 'capacity');
  json.updateString('payload.text', 'https://www.chilkatsoft.com/barcode_overview.asp');

  try {
    fmt.qrCode('validate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('status: ${jsonOut.stringOf('validationStatus')}');
  n = jsonOut.sizeOfArray('checks');
  for (var i = 0; i < n; i++) {
    jsonOut.i = i;
    print('  ${jsonOut.stringOf('checks[i].name')}: ${jsonOut.stringOf('checks[i].status')}');
  }

  // The same text does not fit version 2 at error-correction level H.
  json.updateInt('encoding.qr.maxVersion', 2);
  json.updateString('encoding.qr.errorCorrection', 'H');

  try {
    fmt.qrCode('validate', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('status: ${jsonOut.stringOf('validationStatus')}');
  n = jsonOut.sizeOfArray('checks');
  for (var i = 0; i < n; i++) {
    jsonOut.i = i;
    print('  ${jsonOut.stringOf('checks[i].name')}: ${jsonOut.stringOf('checks[i].status')}');
  }

  n = jsonOut.sizeOfArray('findings');
  for (var i = 0; i < n; i++) {
    jsonOut.i = i;
    print('finding: ${jsonOut.stringOf('findings[i].code')} at ${jsonOut.stringOf('findings[i].path')}');
    print('  ${jsonOut.stringOf('findings[i].message')}');
  }

  // Sample output:

  // status: valid
  //   definition: passed
  //   capacity: passed
  //   layout: notApplicable
  // status: invalid
  //   definition: passed
  //   capacity: failed
  //   layout: notApplicable
  // finding: capacityExceeded at /payload
  //   the payload does not fit any admitted QR version at the selected error-correction level
}