(C#) PC/SC Get Card UID

See more SCard Examples

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Chilkat.SCard scard = new Chilkat.SCard();

// First establish a context to the PC/SC Resource Manager
bool success = scard.EstablishContext("user");
if (success == false) {
    Debug.WriteLine(scard.LastErrorText);
    return;
}

// Use your own smart card reader name here.
success = scard.Connect("ACS ACR122 0","shared","no_preference");
if (success == false) {
    Debug.WriteLine(scard.LastErrorText);
    return;
}

Debug.WriteLine("Connected reader: " + scard.ConnectedReader);
Debug.WriteLine("Active protocol: " + scard.ActiveProtocol);
Debug.WriteLine("ATR: " + scard.CardAtr);
Debug.WriteLine("Reader Status: " + scard.ReaderStatus);

//  Send the APDU command 0xFF, 0xCA, 0x00, 0x00, 0x00
Chilkat.BinData bdRecv = new Chilkat.BinData();
success = scard.TransmitHex(scard.ActiveProtocol,"FFCA000000",bdRecv,32);
if (success == true) {

    Debug.WriteLine("Received: " + bdRecv.GetEncoded("hex"));

    // The UID is the returned data without the final 2 bytes.
    int numBytes = bdRecv.NumBytes;
    if (numBytes > 2) {
        Debug.WriteLine("UID: " + bdRecv.GetEncodedChunk(0,numBytes - 2,"hex"));
    }

}
else {
    Debug.WriteLine(scard.LastErrorText);
}

// Disconnect from this reader.
success = scard.Disconnect("leave");
if (success == false) {
    Debug.WriteLine(scard.LastErrorText);
}

// Applications should always release the context when finished.
success = scard.ReleaseContext();
if (success == false) {
    Debug.WriteLine(scard.LastErrorText);
}