Lazarus Pascal Requires Chilkat v11.7.0+

QR Code with Binary Data

See more QR Code Examples

Demonstrates a QR code that holds arbitrary bytes rather than text. The payload type is binary and the bytes are given as base64 in payload.base64. Any byte value may be used, including zero. Keep in mind that many phone camera apps expect text, so binary payloads are for readers that you control. 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.BinData,
  Chilkat.Formats,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  bd: TBinData;
  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.

  //  The bytes to encode.  Here they come from hex, but they could be loaded from a file with LoadFile.
  bd := TBinData.Create;
  success := bd.AppendEncoded('000102030405FF00FE4368696C6B6174','hex');
  if (success = False) then
    begin
      WriteLn(bd.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  json.UpdateString('payload.type','binary');
  json.UpdateString('payload.base64',bd.GetEncoded('base64'));
  json.UpdateString('output.path','qa_output/qr_binary.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('bytes given: ' + bd.NumBytes);
  WriteLn('bytes encoded: ' + jsonOut.IntOf('symbols[0].payloadBytes'));
  WriteLn('mode: ' + jsonOut.StringOf('symbols[0].selectedEncoding.mode'));
  WriteLn('QR version: ' + jsonOut.IntOf('symbols[0].selectedEncoding.version'));

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

  //  

  //  Sample output:

  //  bytes given: 16
  //  bytes encoded: 16
  //  mode: byte
  //  QR version: 2


  bd.Free;
  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.