Dart

QR Code Generator via api.qrserver.com REST API

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Demonstrates how to generate a QR code using the api.qrserver.com REST API service. 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 http = CkHttp();

  // Send the following GET request to get a binary response.
  // The body of the binary response contains the image data for the QR code.
  // https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

  final queryParams = CkJsonObject();
  queryParams.updateString('data', 'Hello World');
  queryParams.updateString('size', '100x100');

  // Get a PNG file..
  // Possible formats are:
  // png
  // gif
  // jpeg
  // jpg
  // svg
  // eps
  // Case matters.  Use lowercase.
  queryParams.updateString('format', 'png');

  // Send the GET request to an endpoint.
  // Chilkat will add the url-encoded query params passed in the JSON.
  final resp = CkHttpResponse();
  try {
    http.httpParams('GET', 'https://api.qrserver.com/v1/create-qr-code/', queryParams, resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Did it succeed?
  if (resp.statusCode != 200) {
    // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
    print(resp.bodyStr);
    print('Response status = ${resp.statusCode}');
    print('Failed.');
    return;
  }

  // Success if we get here..
  // Save the binary body as the PNG file, or you can get the bytes of the PNG..
  resp.saveBodyBinary('c:/temp/qa_output/qr_code.png');

  // Or get the bytes:
  final bd = CkBinData();
  resp.getBodyBd(bd);
  // Use the bytes in bd...
  // See the online reference documentation for the function to access the bytes directly.

  print('Success.');
}