Lazarus Pascal 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. 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.StringBuilder,
  Chilkat.Formats,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  sbCard: TStringBuilder;
  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 second argument of AppendLine is cktrue to end each line with CRLF.
  sbCard := TStringBuilder.Create;
  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);

  json := TJsonObject.Create;
  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');

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

  WriteLn('vCard length: ' + sbCard.Length);
  WriteLn('QR version: ' + jsonOut.IntOf('symbols[0].selectedEncoding.version'));
  WriteLn('modules: ' + jsonOut.IntOf('symbols[0].dimensions.modulesWide') + ' x ' + jsonOut.IntOf('symbols[0].dimensions.modulesHigh'));
  WriteLn('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


  sbCard.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.