(Delphi DLL) PC/SC Check the Status of each Smart Card Reader (and USB token)

See more SCard Examples

Note: This functionality was introduced in Chilkat v9.5.0.87.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
scard: HCkSCard;
success: Boolean;
stReaders: HCkStringTable;
numReaders: Integer;
i: Integer;
reader: PWideChar;

begin
// 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;

stReaders := CkStringTable_Create();
success := CkSCard_ListReaders(scard,stReaders);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSCard__lastErrorText(scard));
    Exit;
  end;

numReaders := CkStringTable_getCount(stReaders);
i := 0;
while i < numReaders do
  begin
    reader := CkStringTable__stringAt(stReaders,i);

    Memo1.Lines.Add(IntToStr(i) + ': ' + reader);

    // Connect to this reader.
    if (CkSCard_Connect(scard,reader,'shared','no_preference') = True) then
      begin

        // Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
        if (CkSCard_CheckStatus(scard) = True) then
          begin
            Memo1.Lines.Add('ReaderStatus: ' + CkSCard__readerStatus(scard));
            Memo1.Lines.Add('CardAtr: ' + CkSCard__cardAtr(scard));
            Memo1.Lines.Add('ActiveProtocol: ' + CkSCard__activeProtocol(scard));
          end
        else
          begin
            Memo1.Lines.Add(CkSCard__lastErrorText(scard));
            Memo1.Lines.Add('CheckStatus failed.');
          end;

        // Disconnect from this reader.
        success := CkSCard_Disconnect(scard,'leave');
      end
    else
      begin
        Memo1.Lines.Add(CkSCard__lastErrorText(scard));
        Memo1.Lines.Add('Connect failed.');
      end;
    Memo1.Lines.Add('---------------------------------------');
    i := i + 1;
  end;

// Sample output:

// 0: Alcor Micro USB Smart Card Reader 0
// ReaderStatus: specific
// CardAtr: 3B7F96000080318065B0855956FB120FFE829000
// ActiveProtocol: T0
// ---------------------------------------
// 1: Generic Smart Card Reader Interface 0
// ReaderStatus: specific
// CardAtr: 3BFC180000813180459067464A00641606F2727E00E0
// ActiveProtocol: T1
// ---------------------------------------
// 2: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0
// ReaderStatus: specific
// CardAtr: 3BDF96FF8131FE455A018048494443313158587300011B09
// ActiveProtocol: T1
// ---------------------------------------

// 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);
CkStringTable_Dispose(stReaders);

end;