Pascal (Lazarus/Delphi)

PDF List Unsigned Signature Fields

See more PDF Signatures Examples

Demonstrates how to list the unsigned signature fields in a PDF.

Note: This example requires Chilkat v9.5.0.90 or greater.

Pascal (Lazarus/Delphi)

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.Pdf,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  pdf: TPdf;
  json: TJsonObject;
  strVal: string;
  i: Integer;
  count_i: Integer;

begin
  success := False;

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

  pdf := TPdf.Create;

  //  Load a PDF containing 2 remaining unsigned signature fields:
  success := pdf.LoadFile('qa_data/pdf/doctor_patient_parent.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  Note: This example requires Chilkat v9.5.0.90 or greater.
  json := TJsonObject.Create;
  pdf.GetUnsignedSigFields(json);

  json.EmitCompact := False;
  WriteLn(json.Emit());

  //  Result:
  //  {
  //    "unsignedSigField": [
  //      "doctor_signature",
  //      "parent_signature"
  //    ]
  //  }

  //  To iterate over the field names:

  i := 0;
  count_i := json.SizeOfArray('unsignedSigField');
  while i < count_i do
    begin
      json.I := i;
      strVal := json.StringOf('unsignedSigField[i]');
      WriteLn(strVal);
      i := i + 1;
    end;



  pdf.Free;
  json.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.