Delphi ActiveX

PC/SC Get Card UID

See more SCard Examples

Sends the APDU command to get a card's UID. Delphi ActiveX

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
success: Integer;
scard: TChilkatSCard;
bdRecv: TChilkatBinData;
numBytes: Integer;

begin
success := 0;

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

scard := TChilkatSCard.Create(Self);

// First establish a context to the PC/SC Resource Manager
success := scard.EstablishContext('user');
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
    Exit;
  end;

// Use your own smart card reader name here.
success := scard.Connect('ACS ACR122 0','shared','no_preference');
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Connected reader: ' + scard.ConnectedReader);
Memo1.Lines.Add('Active protocol: ' + scard.ActiveProtocol);
Memo1.Lines.Add('ATR: ' + scard.CardAtr);
Memo1.Lines.Add('Reader Status: ' + scard.ReaderStatus);

//  Send the APDU command 0xFF, 0xCA, 0x00, 0x00, 0x00
bdRecv := TChilkatBinData.Create(Self);
success := scard.TransmitHex(scard.ActiveProtocol,'FFCA000000',bdRecv.ControlInterface,32);
if (success = 1) then
  begin

    Memo1.Lines.Add('Received: ' + bdRecv.GetEncoded('hex'));

    // The UID is the returned data without the final 2 bytes.
    numBytes := bdRecv.NumBytes;
    if (numBytes > 2) then
      begin
        Memo1.Lines.Add('UID: ' + bdRecv.GetEncodedChunk(0,numBytes - 2,'hex'));
      end;

  end
else
  begin
    Memo1.Lines.Add(scard.LastErrorText);
  end;

// Disconnect from this reader.
success := scard.Disconnect('leave');
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
  end;

// Applications should always release the context when finished.
success := scard.ReleaseContext();
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
  end;
end;