Lazarus Pascal Requires Chilkat v11.7.0+

Get the QR Code Capabilities of the Chilkat Version in Use

See more QR Code Examples

Demonstrates the capabilities operation, which describes what the installed version of Chilkat can do: the range of QR versions, the error-correction levels, the operations, the image formats and the limits. A program can check for a feature here instead of testing for a Chilkat version number. The request can be an empty JSON object. 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;
  i: Integer;
  n: Integer;

begin
  success := False;

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

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

  WriteLn('Chilkat version: ' + jsonOut.StringOf('productVersion'));
  WriteLn('symbology: ' + jsonOut.StringOf('symbologies[0].id'));
  WriteLn('QR versions: ' + jsonOut.IntOf('symbologies[0].encoding.version.min') + ' to ' + jsonOut.IntOf('symbologies[0].encoding.version.max'));
  WriteLn('structured append, most symbols: ' + jsonOut.IntOf('symbologies[0].structuredAppend.maxSymbols'));

  n := jsonOut.SizeOfArray('symbologies[0].encoding.errorCorrection');
  for i := 0 to n - 1 do
    begin
      jsonOut.I := i;
      WriteLn('error correction: ' + jsonOut.StringOf('symbologies[0].encoding.errorCorrection[i]'));
    end;

  //  The operations this version implements.
  n := jsonOut.SizeOfArray('operations');
  for i := 0 to n - 1 do
    begin
      jsonOut.I := i;
      if (jsonOut.BoolOf('operations[i].available') = True) then
        begin
          WriteLn('operation: ' + jsonOut.StringOf('operations[i].name'));
        end;
    end;

  n := jsonOut.SizeOfArray('imageFormats.output');
  for i := 0 to n - 1 do
    begin
      jsonOut.I := i;
      WriteLn('image format: ' + jsonOut.StringOf('imageFormats.output[i]'));
    end;

  WriteLn('default timeout: ' + jsonOut.IntOf('limits.timeoutMs.default') + ' ms');
  WriteLn('default largest image: ' + jsonOut.IntOf('limits.maxPixels.default') + ' pixels');

  //  Sample output:

  //  Chilkat version: 11.7.0
  //  symbology: qr
  //  QR versions: 1 to 40
  //  structured append, most symbols: 16
  //  error correction: auto
  //  error correction: L
  //  error correction: M
  //  error correction: Q
  //  error correction: H
  //  operation: generate
  //  operation: measure
  //  operation: validate
  //  operation: capabilities
  //  image format: png
  //  image format: svg
  //  default timeout: 10000 ms
  //  default largest image: 16777216 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.