PHP socket message null

Question

I open a socket in php and i send a message. When I try to read the message in Java in this socket the connection is established but the message is null?

Any help? Cannot read response from Java socket server using PHP client this is the same problem i have but i do put \n in the message.

  // variables
        $host = gethostbyname('localhost');
        $port = 4444;   
        $message = $host." list\n\0";

        // create socket
        if (!($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) {
            $errorcode = socket_last_error();
            $errormsg = socket_strerror($errorcode);
            die("Couldn't create socket: [$errorcode] $errormsg \n");
        }
        echo "Socket created!\n";

        // connect
        if (!socket_connect($sock, $host, $port)) {
            $errorcode = socket_last_error();
            $errormsg = socket_strerror($errorcode);
            die("Couldn't connect: [$errorcode] $errormsg \n");
        }
        echo "Connection established!\n";
        echo $message;
        $length = strlen($message);
        // get room info - send message
        while(true){
            $sent=sock_write($sock, $message, 1024);
            if ($sent===false) {
                $errorcode = socket_last_error();
                $errormsg = socket_strerror($errorcode);
                die("Couldn't send data: [$errorcode] $errormsg \n");
            }
            // Check if the entire message has been sented
                if ($sent < $length) {

                // If not sent the entire message.
                // Get the part of the message that has not yet been sented as message
               $st = substr($msg, $sent);
               $message= $st;

                // Get the length of the not sented part
                $length -= $sent;

            } else {

                break;
            }


        }           

        echo "Message sent!\n";

and the java side

 while (true) { 

        try {

            socket = new ServerSocket(4444);


        } catch (UnknownHostException e) {
            System.err.println("Dont know about host: localhost.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to localhost");
            System.exit(1);
        }

        try {

            clientSocket = socket.accept();
            System.out.printf("Connected!\n");

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

        try {

            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);    //object to send data
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); //object to read data
            String inputLine, outputLine;
            inputLine = in.readLine();  //read data

            System.out.println(inputLine);

The Java code operates like a gateway to the server.

Could you give some more detail? The sending and receiving parts of the code would be very helpful. — Kosi2801
– Kosi2801, Commented Oct 29, 2012 at 20:46
You gonna need to provide the server and the client classes code you are using. Otherwise we won't be able to help you — Bruno Vieira
– Bruno Vieira, Commented Oct 29, 2012 at 20:49

user207421 · Accepted Answer · 2012-10-29 22:09:58Z

0

$sent=sock_write($sock, $message, 1024);

This should be

$sent=sock_write($sock, $message, $length);

Or even $length-1 as Java isn't interested in the trailing null.

answered Oct 29, 2012 at 22:09

user207421

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