Lazarus Pascal Requires Chilkat v11.7.0+

Create a Wi-Fi QR Code

Demonstrates a QR code that joins a phone to a Wi-Fi network when scanned. A QR code only holds text. Phones recognize text of the form WIFI:T:;S:;P:;; and offer to join the network. T is WPA (also used for WPA2 and WPA3), WEP, or nopass for an open network, and H:true can be added for a hidden network. In the name and the password, the characters backslash, semicolon, comma, colon and double quote must each be preceded by a backslash.

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Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Formats,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  json: TJsonObject;
  fmt: TFormats;
  jsonOut: TJsonObject;

begin
  success := False;

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

  json := TJsonObject.Create;
  json.UpdateString('payload.text','WIFI:T:WPA;S:Chilkat Guest;P:correct-horse-battery-staple;;');

  //  Level Q, so that the code still scans when it is printed small or gets worn.
  json.UpdateString('encoding.qr.errorCorrection','Q');
  json.UpdateInt('render.moduleSize',8);

  //  Say which network it is under the code.
  json.UpdateBool('render.text.enabled',True);
  json.UpdateString('render.text.value','Wi-Fi: Chilkat Guest');
  json.UpdateInt('render.text.scale',2);

  json.UpdateString('output.path','qa_output/qr_wifi.png');
  json.UpdateBool('output.overwrite',True);
  json.UpdateString('output.return','none');

  fmt := TFormats.Create;
  jsonOut := TJsonObject.Create;
  success := fmt.QrCode('generate',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(fmt.LastErrorText);
      Exit;
    end;

  WriteLn('file: ' + jsonOut.StringOf('outputs[0].path'));
  WriteLn('QR version: ' + jsonOut.IntOf('symbols[0].selectedEncoding.version'));
  WriteLn('image: ' + jsonOut.IntOf('outputs[0].width') + ' x ' + jsonOut.IntOf('outputs[0].height') + ' pixels');

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

  //  

  //  Sample output:

  //  file: qa_output/qr_wifi.png
  //  QR version: 5
  //  image: 360 x 374 pixels


  json.Free;
  fmt.Free;
  jsonOut.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.