You do not access your dictionary in a thread-safe way, which means that the listening thread, which may add items to the dictionary, can operate on the object at the same time that a client-serving thread is trying to examine the dictionary.However, inspection of the code reveals two significant problems: It is not clear from your question what problems specifically it is you are having. Int byte_count = ns.Read(receivedBytes, 0, receivedBytes.Length) Īrray.Copy(receivedBytes, formated, byte_count) Ĭonsole.WriteLine('disconnect from server!!')

IPAddress ip = IPAddress.Parse('127.0.0.1') īyte buffer = (s)

I created this box, so I can pass 2 args for the Thread.start().

Public static void broadcast(Dictionary conexoes, string data)īyte buffer = (data) handle the null characteres in the byte arrayĪrray.Copy(buffer, formated, byte_count) Int byte_count = stream.Read(buffer, 0, buffer.Length) NetworkStream stream = box.c.GetStream() Public static void handle_clients(object o) TcpClient client = ServerSocket.AcceptTcpClient() Ĭonsole.WriteLine('Someone connected!!') TcpListener ServerSocket = new TcpListener(IPAddress.Any, 5000) When there is 1 client connected, it works as expected, the problem is occurred when there is more than 1 client connected.ĭictionary list_clients = new Dictionary () So, I decided to make a TCP chat, the basic idea is that A client send data to the server, then the server broadcast it for all the clients online (in this case all the clients are in a dictionary). These codes work properly and I can multi-chat very clean.I'm learning c# socket programming. Public void broadcast(String serverMessage, UserThread excludeUser) UserThread newUser = new UserThread(socket, this) ServerSocket serverSocket = new ServerSocket(9999) But I wonder how to create and send a private message to a spesific user into the chat. I was following the tutorials and I can send messages that every user in the application can see. I am working on a multi-client chat application on Java. I am new at stackoverflow and I am sorry if this kind of a question is asked before but did a quick search and I could not find any title like mine.

Multi chat client