UDP send receive application

Hi all

I'm writing an application to send UDP packets. I had no problem with the send() call, but I would try to receive the message sent, perhaps on the same connection. (I use another connection to receive in the same thread, but the result is the same).

The application thus written, block in the first reception. Could someone help me?

package ProvaInvioRicezione;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.MainScreen;
import javax.microedition.io.Connector;
import javax.microedition.io.DatagramConnection;
import javax.microedition.io.Datagram;
import java.lang.String;

public class EsempioInvio extends UiApplication
{
public static void main(String[] args)
{
        EsempioInvio theApp = new EsempioInvio();
theApp.enterEventDispatcher();
}
public EsempioInvio()
{
pushScreen(new HelloWorldScreen());
}
}
final class HelloWorldScreen extends MainScreen
{
public HelloWorldScreen()
{
        super();
        LabelField title = new LabelField("Esempio di invio pacchetti",
                        LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
        setTitle(title);
        add(new RichTextField("Cambia stringa cazzo!"));
        //add(new RichTextField("Datagram packet was sent"));
        byte[] outBuff = "Soccia!".getBytes();
        byte[] buf = new byte[256];
    //byte[] buf = new byte[256];
    try {
        //creo socket per mandare il pkt

      DatagramConnection connection = (DatagramConnection)Connector.open("datagram://127.0.0.1:2000");
      Datagram outDatagram = connection.newDatagram(outBuff, outBuff.length);

      connection.send(outDatagram);

      DatagramConnection recConnection = (DatagramConnection)Connector.open("datagram://127.0.0.1:2000");
      Datagram inDatagram = recConnection.newDatagram(buf, buf.length);

      while(true){
          System.out.println("Ciao sono qua");
      recConnection.receive(inDatagram);

      String received = new String(inDatagram.getData());
      add(new RichTextField("Stringa ricevuta:"+received));
    }

    } catch (Exception e) {
        add(new RichTextField(e.getMessage()+":"));
        add(new RichTextField(e.getClass().getName()));
    }

}
public boolean onClose()
{
Dialog.alert("Bye bye n00b!");
System.exit(0);
return true;
}
}

Problem solved. I used another connection is listening on port even reeive data and udpdemo now work correctly. There was a funny bug tooc the sample application print a message from output og OK don't receive that if the payload of the packet is "RECEIVED"... the payload, not the status

Tags: BlackBerry Developers

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