CODEWITHSUNDEEP
javac#socketstcp
nyconing
nyconing

Reputation: 1136

Java(client) and C#(Server) TCP Socket. and Server read infinite last data from client

Java(client) and C#(Server) TCP Socket. and Server read infinite last data from client(Java) I has been search for entire day already, its weird.

I created 2 client: Java(real), C#(for testing) like this:

Java(Real):

Socket socket = new Socket(SyncActivity.ip,SyncActivity.port);
DataOutputStream out;
out = new DataOutputStream(socket.getOutputStream());
String s = "Hello!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!$";
out.write(s.getBytes(),0,s.getBytes().length);
out.flush();
s = "Yes this another data$";
out.write(s.getBytes(),0,s.getBytes().length);
out.flush();
socket.shutdownInput();
socket.shutdownOutput();
socket.close();
Thread.currentThread().interrupt();

and C#(for testing)

System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();
clientSocket.Connect("192.168.0.138", 11838);
NetworkStream serverStream = clientSocket.GetStream();
byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textBox2.Text + "$");
serverStream.Write(outStream, 0, outStream.Length);
serverStream.Flush();

On C#(testing) side, sent one data to server, and server readed the data once and blocked to wait another data.(second data same as reading it once and blocked)I just want like this.

On Java(Real)side, sent two data to server and server reading 1st data once and read same 2nd data forever. Java side is verified sent only once.

It is full data I was received. Why? its weird.

result as:

on C#(testing)

Client request connection.

Server accept and created connection.

Server try Read (and Blocked)

Client send >> TextBox

Server received >> TextBox

Server try Read (and Blocked)

but on Java(Real):

Client request connection.

Server accept and created connection.

Server try Read (and Blocked)

Client send >> Hello!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Server received >> Hello!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Client send >> Yes this another data

Server try Read

Server received >> Yes this another data

Server try Read

Server received >> Yes this another data

Server try Read

Server received >> Yes this another data

Server try Read

Server received >> Yes this another data

Server try Read

Server received >> Yes this another data

Server try Read

Server received >> Yes this another data

(and forever and forever)

Server code:

    TcpListener serverSocket = new TcpListener(IPAddress.Any, Convert.ToInt16(Ini.IniReadValue("About", "ServerPort", "MVS_VAN.info")));
    TcpClient clientSocket = default(TcpClient);
    serverSocket.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
    serverSocket.Start();
    clientSocket = serverSocket.AcceptTcpClient();
    serverSocket.Stop();
    NetworkStream networkStream = clientSocket.GetStream();
    byte[] bytesFrom = new byte[128000];
    do
    {
                        Socket soc = clientSocket.Client;
                        soc.Receive(bytesFrom);
                        string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                        dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                        MessageBox.Show("", dataFromClient);
                        networkStream.Flush();

                    //networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                    //string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    //dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                    //tried ^ this 3 line also.

                    } while ((true));
    clientSocket.Close();
    serverSocket.Stop();

Upvotes: 2

Views: 590

Answers (2)

user207421
user207421

Reputation: 311023

The server is ignoring the count returned by Receive(). It is therefore (a) ignoring endi of stream and (b) processing invalid data in the buffer.

Upvotes: 0

nyconing
nyconing

Reputation: 1136

Im found what is the problem after a day investigate.

but its still weird:

on Java Client:

socket.close();//<--here causing a start of server read same last data infinitly

it was not closing it properly. maybe where protocol is still close_wait state to ensure all packets is arrived to server?

.

fake resolve:

Im write my own command packets send to server like "cmd_request_close_connection", and close the connection on server side when server receive packet like this.

Upvotes: -1

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