Android™

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

See more SCard Examples

Demonstrates how to list the smart card readers and USB tokens connected to the computer, and check the status of each.

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

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // 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
    success = scard.EstablishContext("user");
    if (success == false) {
        Log.i(TAG, scard.lastErrorText());
        return;
        }

    CkStringTable stReaders = new CkStringTable();
    success = scard.ListReaders(stReaders);
    if (success == false) {
        Log.i(TAG, scard.lastErrorText());
        return;
        }

    int numReaders = stReaders.get_Count();
    int i = 0;
    while (i < numReaders) {
        String reader = stReaders.stringAt(i);

        Log.i(TAG, String.valueOf(i) + ": " + reader);

        // Connect to this reader.
        if (scard.Connect(reader,"shared","no_preference") == true) {

            // Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
            if (scard.CheckStatus() == true) {
                Log.i(TAG, "ReaderStatus: " + scard.readerStatus());
                Log.i(TAG, "CardAtr: " + scard.cardAtr());
                Log.i(TAG, "ActiveProtocol: " + scard.activeProtocol());
                }
            else {
                Log.i(TAG, scard.lastErrorText());
                Log.i(TAG, "CheckStatus failed.");
                }

            // Disconnect from this reader.
            success = scard.Disconnect("leave");
            }
        else {
            Log.i(TAG, scard.lastErrorText());
            Log.i(TAG, "Connect failed.");
            }

        Log.i(TAG, "---------------------------------------");
        i = i + 1;
        }

    // 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 = scard.ReleaseContext();
    if (success == false) {
        Log.i(TAG, scard.lastErrorText());
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}