TCP Client Socket - Receive incoming traffic

Kubax · by **Kubax** » Wed May 20, 2009 9:37 pm

Hi,

I'm just trying to write my first application in java.

The Application connects to my VDR (Media Center) and send's SVDR Commands like "CHAN +" so seitch channel up.
Now i'm trying to set the Volume, or get the EPG Date, but for this i need to get incoming traffic from the Server.
When i send "VOLU" to the Server, it responses with the Volume set atm.

The application works great at the Moment (Channel up, Channel down and 0 to 9 implemented right now)

could you help me how to get the answeres from the server?

here's my code from the client.java:

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package com.e2esp.socket.test;
 
import android.content.SharedPreferences;
 
import java.io.BufferedReader;
 
import java.io.BufferedWriter;
 
import java.io.OutputStreamWriter;
 
import java.io.InputStreamReader;
 
import java.io.PrintWriter;
 
import java.net.InetAddress;
 
import java.net.ServerSocket;
 
import java.net.Socket;
 
import android.preference.PreferenceManager;
 
import android.util.Log;
 
public class TCPClient implements Runnable {
 
    public static final String DEFAULT_SERVERIP = "192.168.178.22";
 
    public static final int SERVERPORT = 2001;
 
    public static String message = "";
 
        public SharedPreferences prefs; 
 
        public static final String PREFS_NAME = "MyPrefsFile";
 
    public void run() {
 
         try {
 
                 /*SharedPreferences settings = this.
 
                 public String server = settings.getString("SERVERIP","DEFAULT_SERVERIP");
 
                 settings.*/
 
           InetAddress serverAddr = InetAddress.getByName(DEFAULT_SERVERIP);
 
                 //InetAddress serverAddr = InetAddress.getByName();
 
           Log.d("TCP", "C: Connecting...");
 
           Socket socket = new Socket(serverAddr, TCPClient.SERVERPORT);
 
           //String message = "CHAN +\n";
 
               try {
 
                Log.d("TCP", "C: Sending: '" + message + "'");
 
                PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
 
                BufferedReader in = new BufferedReader(socket.getInputStream());
 
                out.println(message);
 
                Log.d("TCP", "C: Sent.");
 
                  Log.d("TCP", "C: Done.");
 
             } catch(Exception e) {
 
                 Log.e("TCP", "S: Error", e);
 
                } finally {
 
                  socket.close();
 
                }
 
         } catch (Exception e) {
 
              Log.e("TCP", "C: Error", e);
 
         }
 
    } 
 
    } 
 
Parsed in 0.038 seconds,  using GeSHi 1.0.8.4

Couillette · by **Couillette** » Fri May 22, 2009 12:35 pm

Hello.

2 ways :
- If the server only send data after the reception of a command, you can use a BufferedReader and the method readLine or a BufferedInputStream. Like you already done here.

You would have a thing like that under the println line out.println(message);

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String message = in.readLine();
 
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

If it doesn"t work, use a BufferedInputStream, if the server doesn't put a new line after the message, the readLine will not pass.

- If the server send state messages or thing like that, you must use a thread to read on the socket.

Bye

TCP Client Socket - Receive incoming traffic

TCP Client Socket - Receive incoming traffic

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