(Delphi ActiveX) Transition from Crypt2.GetSignerCertChain to Crypt2.LastSignerCert

Provides instructions for replacing deprecated GetSignerCertChain method calls with LastSignerCert.

Note: This example requires Chilkat v11.0.0 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
crypt2: TChilkatCrypt2;
index: Integer;
certchainObj: IChilkatCertChain;
signerCert: TChilkatCert;
success: Integer;
certChain: TChilkatCertChain;

begin
crypt2 := TChilkatCrypt2.Create(Self);

// ...
// ...
index := 0;

// ------------------------------------------------------------------------
// The GetSignerCertChain method is deprecated:

certchainObj := crypt2.GetSignerCertChain(index);
if (crypt2.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(crypt2.LastErrorText);
    Exit;
  end;

// ...
// ...

// ------------------------------------------------------------------------
// Do the equivalent using LastSignerCert, and then get the certificate chain from the cert.
// Your application creates a new, empty Cert object which is passed 
// in the last argument and filled upon success.

signerCert := TChilkatCert.Create(Self);
success := crypt2.LastSignerCert(index,signerCert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt2.LastErrorText);
    Exit;
  end;

certChain := TChilkatCertChain.Create(Self);
success := signerCert.BuildCertChain(certChain.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(signerCert.LastErrorText);
    Exit;
  end;
end;