APDU connections- APDUMIDLET

APDUMIDLET

package com.nokia.midp.examples.satsa.apdu;

import java.lang.*;
import java.io.*; 
import javax.microedition.io.Connector; 
import javax.microedition.apdu.APDUConnection; 
import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 

/**
 * APDUMIDlet illustrates the implementation of the SATSA APDU optional package.
 * This midlet establish a connection to the smartcard, sends a sample APDU and 
 * shows the result values on screen.
 */
 
public class APDUMIDlet extends MIDlet implements CommandListener, Runnable 
{ 
  private final String CardSlot0 = "apdu:0;target=a0.00.00.00.62.03.01.0c.02.01"; 
   
  private APDUConnection cardConnection0;
  private Display display; 
  private Form mainForm; 
  private Command exitCommand, demoCommand, backCommand;
  private Form progressForm; 

/** Constructor for the APDUMIDlet. Creates required commands and the form. */
 
  public APDUMIDlet() { 
    exitCommand = new Command("Exit", Command.EXIT, 0); 
    demoCommand = new Command("Demo", Command.SCREEN, 0);
    backCommand = new Command("Back", Command.BACK, 0); 
 
    mainForm = new Form("APDU API Example"); 
    mainForm.append(" Press Demo to open smartcard connection.");
    mainForm.addCommand(exitCommand); 
    mainForm.addCommand(demoCommand); 
    mainForm.setCommandListener(this); 
  } 
   
  public void startApp() { 
    display = Display.getDisplay(this); 
         display.setCurrent(mainForm); 
  } 
   
  public void pauseApp() {} 
     public void destroyApp(boolean unconditional) {} 
   
  public void commandAction(Command c, Displayable s) { 
    if (c == exitCommand) { 
      notifyDestroyed(); 
    } 
    else if (c == demoCommand) { 
      progressForm = new Form("Opening connection ..."); 
      display.setCurrent(progressForm); 
       
      Thread t = new Thread(this); 
      t.start(); 
    } 
    else if (c == backCommand) { 
      display.setCurrent(mainForm); 
    } 
  } 
   
  public void run() { 
    try { 
      setProgress("Opening card at slot 0"); 
      cardConnection0 = (APDUConnection)Connector.open(CardSlot0); 

      setProgress("Exchanging APDUs with card slot 0"); 

      byte[] response = cardConnection0.exchangeAPDU(kCardAPDU); 

      progressForm.setTitle("Closing connection..."); 
      
      cardConnection0.close(); 
      
      progressForm.setTitle("Done.");

/** Converts bytes to string format. */

      String s="";
      for ( int j=0; j < response.length; j++){
        int tmp = response[j];
        if( tmp < 0 ) tmp += 256;
        String tmps = Integer.toHexString( tmp );
        if( tmps.length() == 1 ) tmps = "0" + tmps;
       	s += tmps + " ";
      }

      Form g = new Form("Response APDU:"); 
      g.append(s); 
      g.addCommand(backCommand); 
      g.setCommandListener(this); 
      display.setCurrent(g); 
    } 
    catch (Exception e) { 
      try { cardConnection0.close(); } catch (Throwable t) {} 
            
      Form f = new Form("Exception"); 
      f.append(e.toString()); 
      f.addCommand(backCommand); 
      f.setCommandListener(this); 
      display.setCurrent(f); 
    } 
  } 
   
  private void setProgress(String s) { 
    StringItem si = new StringItem(null, s); 
    si.setLayout(Item.LAYOUT_2 | Item.LAYOUT_NEWLINE_AFTER); 
    progressForm.append(si); 
  } 
 
/** A sample APDU. */

  private final byte[] kCardAPDU = 
    // Select File EF_ID
    {(byte)0x00, (byte)0xA4, (byte)0x08, (byte)0x00,
     (byte)0x02, (byte)0x00, (byte)0x03 };
    // should return 01 90 00
}