(Java) PC/SC Get Card UID

See more SCard Examples

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

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSCard scard = new CkSCard();

    // First establish a context to the PC/SC Resource Manager
    boolean success = scard.EstablishContext("user");
    if (success == false) {
        System.out.println(scard.lastErrorText());
        return;
        }

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

    System.out.println("Connected reader: " + scard.connectedReader());
    System.out.println("Active protocol: " + scard.activeProtocol());
    System.out.println("ATR: " + scard.cardAtr());
    System.out.println("Reader Status: " + scard.readerStatus());

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

        System.out.println("Received: " + bdRecv.getEncoded("hex"));

        // The UID is the returned data without the final 2 bytes.
        int numBytes = bdRecv.get_NumBytes();
        if (numBytes > 2) {
            System.out.println("UID: " + bdRecv.getEncodedChunk(0,numBytes - 2,"hex"));
            }

        }
    else {
        System.out.println(scard.lastErrorText());
        }

    // Disconnect from this reader.
    success = scard.Disconnect("leave");
    if (success == false) {
        System.out.println(scard.lastErrorText());
        }

    // Applications should always release the context when finished.
    success = scard.ReleaseContext();
    if (success == false) {
        System.out.println(scard.lastErrorText());
        }
  }
}