[JAVA] [API Javax Comm] Lire Port COM

je presque le meme problème je veux envoyer des commandes AT vers mon prtable samsung connecté via usb le prog affiche deux com 4 et 5 plus que 3 qui est (com3 c'est le com de mon modem pc)
lorsque j'envois ces commandes rien ne se passe (pas de résultat)
mais lorsque je ferme ou je j'ouvre le clavier des caractéres bizaares et des carreaux s'affiches et mot locked ou un locked détirées. je croix que mon portable ne recoit pas ces commandes .
si vous avez recontre ce prob contacte moi sur msn [supprimé par la modération] j e vraiment besoin de ton aide,je suis mnt de réaliser ce truc com mon pfe et il y on ad'autres proble......

voici ce code et j'attends vos idées sur mon hotmail :


/*Most projects that deal with hardware and devices, needs to communicate with them using the COM port of the PC or Server. For example if there is a modem that is connected to a server via its COM port and the Java program has to read the output of the modem then the Java program has to read the COM port for any incoming data.

This sample Java program can be used to Read from a COM port for incoming data and process it. Note that you will need to change the Port number to COM1 or COM2 or any other ports as required.

Also if you are using unix based machines then you will have to uncomment the /dev/term/a instead of COM.*/

import java.io.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.*;
import javax.comm.*;
import com.sun.comm.Win32Driver;

public class SimpleRead implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;

    static InputStream inputStream;
    static SerialPort serialPort;
    static Thread readThread;
    static OutputStream outputStream;
    static SerialPortEvent event;
    private static BufferedReader in;
    
    public SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("Envoi", 20000);
            }
        catch (PortInUseException e) {System.out.println(e);}

  /*  try {
            serialPort.addEventListener(this);
        }
       catch (TooManyListenersException e) {System.out.println(e);}*/

              serialPort.notifyOnDataAvailable(true);

        try {
                serialPort.setSerialPortParams(9600,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
            }
        catch (UnsupportedCommOperationException e) {System.out.println(e);}

        readThread = new Thread(this);
        readThread.start();
    }

    public static void EcritureSurRS232(String data ) {
      try
      {
        outputStream = serialPort.getOutputStream();
        outputStream.write(data.getBytes());
      }
      catch (IOException e)
      {
       System.out.println("erreur dans l'écriture sur le port série\n" +
                                        e.getMessage());
      }
    }

    public static void lecturePortRS232() throws IOException{
        //byte[] readBuffer = new byte[2];
   char[] charbuffer=new char[100];
             //inputStream= serialPort.getInputStream();

               try {
                    //while (inputStream.available() > 0) {
                    //int numBytes = inputStream.read(readBuffer);
                   //}
                    //System.out.print(new String(readBuffer));
                          in=new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
                         String codeBarre = new String();
                        try {
                               //lecture du buffer et affichage
                               codeBarre = (String) in.readLine();
                             System.out.println(codeBarre);
                            } catch (IOException e) {}
                  //in.close();
               }
               catch (IOException ex)
                   {
                   System.out.println("erreur dans la lecture du port\n"+ex.getMessage());
                   }

    }

    public void run() {
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {System.out.println(e);}
    }

 public void serialEvent(SerialPortEvent event) {
      switch(event.getEventType()) {
        case SerialPortEvent.BI:
        case SerialPortEvent.OE:
        case SerialPortEvent.FE:
        case SerialPortEvent.PE:
        case SerialPortEvent.CD:
        case SerialPortEvent.CTS:
        case SerialPortEvent.DSR:
        case SerialPortEvent.RI:
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;
        case SerialPortEvent.DATA_AVAILABLE:
          byte[] readBuffer = new byte[20];

            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                }
                System.out.print(new String(readBuffer));
            } catch (IOException e) {System.out.println(e);}
            break;
        }
    }
        public static void main(String[] args) throws IOException {
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM4")) 
                 {
                    SimpleRead reader = new SimpleRead();
                    System.out.println("saisir la commande :") ;
                    BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in));
                    String data=stdin.readLine();
                    EcritureSurRS232(data);
                    lecturePortRS232();
                }
            }
        }
    }
}