Delphi DLL

PC/SC Get Card UID

See more SCard Examples

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
scard: HCkSCard;
bdRecv: HCkBinData;
numBytes: Integer;

begin
success := False;

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

scard := CkSCard_Create();

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

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

Memo1.Lines.Add('Connected reader: ' + CkSCard__connectedReader(scard));
Memo1.Lines.Add('Active protocol: ' + CkSCard__activeProtocol(scard));
Memo1.Lines.Add('ATR: ' + CkSCard__cardAtr(scard));
Memo1.Lines.Add('Reader Status: ' + CkSCard__readerStatus(scard));

//  Send the APDU command 0xFF, 0xCA, 0x00, 0x00, 0x00
bdRecv := CkBinData_Create();
success := CkSCard_TransmitHex(scard,CkSCard__activeProtocol(scard),'FFCA000000',bdRecv,32);
if (success = True) then
  begin

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

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

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

// Disconnect from this reader.
success := CkSCard_Disconnect(scard,'leave');
if (success = False) then
  begin
    Memo1.Lines.Add(CkSCard__lastErrorText(scard));
  end;

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

CkSCard_Dispose(scard);
CkBinData_Dispose(bdRecv);

end;