(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pdf: TChilkatPdf;
success: Integer;
json: TChilkatJsonObject;
strVal: WideString;
i: Integer;
count_i: Integer;

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

pdf := TChilkatPdf.Create(Self);

// Load a PDF containing 2 remaining unsigned signature fields:
success := pdf.LoadFile('qa_data/pdf/doctor_patient_parent.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

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

json.EmitCompact := 0;
Memo1.Lines.Add(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]');
    Memo1.Lines.Add(strVal);
    i := i + 1;
  end;
end;