C server not receiving java/android client message

Question

I am still new with sockets, and am having a little problem with creating an android client ac server.

The c server is runs well, and android client connects also well to the c server. But the problem comes when communicating with the server. When I try to send a simple message, the server doesn't seem to receive it at all.

So here is the code of the server waiting for the message :

void readMsg(int client){
    char buffer[1024];
    int n = 0;

    memset(buffer, 0, sizeof(buffer));

    printf("waiting for message..\n");
    while(( n=recv(client, buffer, sizeof buffer - 1, 0)) > 0){
        printf("recv=%s\n", buffer);
    }

    printf("n=%d\n", n);
}

And nothing at all is displayed. It's blocked on waiting for message.. .

And concerning the java code to send the message, here it is :

OutputStreamWriter osw;
PrintWriter pw;
try {
    osw = new OutputStreamWriter(server.getOutputStream(), "UTF-8");
    pw = new PrintWriter(osw, true);
    pw.print(msg);
    pw.flush();

}catch(IOException ioe) {
    ioe.printStackTrace();
}

[EDIT]

Just to provide more information, the function readMsg() is called just after starting the server and once the client is connected.

For more information, here is the way I connect to the server :

try{
   //I am sure that the host and port are correct
   Socket server = new Socket(host, port);

}catch(IOException ioe){
    ioe.printStackTrace();
}

Okay, so I found out what went wrong, I was in fact connecting twice to the server. As a result it couldn't send the message through the right socket.

Sorry for everything and thank you for all your help

[/EDIT]

I've already tried several solutions by looking at several other posts on this site.

Thank you in advance for all help

Answer 1

use a println instead of print , also wrap the OutputStreamWriter inside a BufferedWriter

pw = new PrintWriter(new BufferedWriter(osw), true);
pw.println(msg);