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프로그램 설명

실행 후

Connect 버튼 클릭 후

메시지 전송 후

프로그램 작성

1. handleClient.cs (서버에서 사용하는 클래스)

    class handleClient
    {
        TcpClient clientSocket = null;
        public Dictionary<Tcpclient, string> clientList = null;

        public void startClient(TcpClient clientSocket, Dictionary<Tcpclient, string> clientList)
        {
            this.clientSocket = clientSocket;
            this.clientList = clientList;

            Thread t_hanlder = new Thread(doChat);
            t_hanlder.IsBackground = true;
            t_hanlder.Start();
        }

        public delegate void MessageDisplayHandler(string message, string user_name);
        public event MessageDisplayHandler OnReceived;

        public delegate void DisconnectedHandler(TcpClient clientSocket);
        public event DisconnectedHandler OnDisconnected;

        private void doChat()
        {
            NetworkStream stream = null;
            try
            {
                byte[] buffer = new byte[1024];
                string msg = string.Empty;
                int bytes = 0;
                int MessageCount = 0;

                while (true)
                {
                    MessageCount++;
                    stream = clientSocket.GetStream();
                    bytes = stream.Read(buffer, 0, buffer.Length);
                    msg = Encoding.Unicode.GetString(buffer, 0, bytes);
                    msg = msg.Substring(0, msg.IndexOf("$"));

                    if (OnReceived != null)
                        OnReceived(msg, clientList[clientSocket].ToString());
                }
            }
            catch (SocketException se)
            {
                Trace.WriteLine(string.Format("doChat - SocketException : {0}", se.Message));

                if (clientSocket != null)
                {
                    if (OnDisconnected != null)
                        OnDisconnected(clientSocket);

                    clientSocket.Close();
                    stream.Close();
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(string.Format("doChat - Exception : {0}", ex.Message));

                if (clientSocket != null)
                {
                    if (OnDisconnected != null)
                        OnDisconnected(clientSocket);

                    clientSocket.Close();
                    stream.Close();
                }
            }
        }

    }

2. 서버 프로그램

    public partial class MainForm : Form
    {
        TcpListener server = null;
        TcpClient clientSocket = null;
        static int counter = 0;

        public Dictionary<Tcpclient, string> clientList = new Dictionary<Tcpclient,string>();
 
        public MainForm()
        {
            InitializeComponent();

            // socket start
            Thread t = new Thread(InitSocket);
            t.IsBackground = true;
            t.Start();
        }

        private void InitSocket()
        {
            server = new TcpListener(IPAddress.Any, 9999);
            clientSocket = default(TcpClient);
            server.Start();
            DisplayText(">> Server Started");

            while(true)
            {
                try
                {
                    counter++;
                    clientSocket = server.AcceptTcpClient();
                    DisplayText(">> Accept connection from client");

                    NetworkStream stream = clientSocket.GetStream();
                    byte[] buffer = new byte[1024];
                    int bytes = stream.Read(buffer, 0, buffer.Length);
                    string user_name = Encoding.Unicode.GetString(buffer, 0, bytes);
                    user_name = user_name.Substring(0, user_name.IndexOf("$"));

                    clientList.Add(clientSocket, user_name);

                    // send message all user
                    SendMessageAll(user_name + " Joined ", "",  false);

                    handleClient h_client = new handleClient();
                    h_client.OnReceived += new handleClient.MessageDisplayHandler(OnReceived);
                    h_client.OnDisconnected += new handleClient.DisconnectedHandler(h_client_OnDisconnected);                    
                    h_client.startClient(clientSocket, clientList);
                }
                catch (SocketException se)
                {
                    Trace.WriteLine(string.Format("InitSocket - SocketException : {0}", se.Message));
                    break;
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(string.Format("InitSocket - Exception : {0}", ex.Message));
                    break;
                }
            }

            clientSocket.Close();
            server.Stop();
        }

        void h_client_OnDisconnected(TcpClient clientSocket)
        {
            if (clientList.ContainsKey(clientSocket))
                clientList.Remove(clientSocket);
        }

        private void OnReceived(string message, string user_name)
        {
            string displayMessage = "From client : " + user_name + " : " + message;
            DisplayText(displayMessage);
            SendMessageAll(message, user_name, true);
        }

        public void SendMessageAll(string message, string user_name, bool flag)
        {
            foreach(var pair in clientList)
            {
                Trace.WriteLine(string.Format("tcpclient : {0} user_name : {1}", pair.Key, pair.Value));

                TcpClient client = pair.Key as TcpClient;
                NetworkStream stream = client.GetStream();
                byte[] buffer = null;

                if(flag)
                {
                    buffer = Encoding.Unicode.GetBytes(user_name + " says : " + message);
                }
                else
                {
                    buffer = Encoding.Unicode.GetBytes(message);
                }
                
                stream.Write(buffer, 0, buffer.Length);
                stream.Flush();
            }
        }

        private void DisplayText(string text)
        {
            if (richTextBox1.InvokeRequired)
            {
                richTextBox1.BeginInvoke(new MethodInvoker(delegate
                {
                    richTextBox1.AppendText(text + Environment.NewLine);
                }));
            }
            else
                richTextBox1.AppendText(text + Environment.NewLine);
        }
    }

3. 클라이언트 프로그램

    public partial class MainForm : Form
    {
        TcpClient clientSocket = new TcpClient();
        NetworkStream stream = default(NetworkStream);
        string message = string.Empty;

        public MainForm()
        {
            InitializeComponent();
        }

        private void btnSendText_Click(object sender, EventArgs e)
        {
            byte[] buffer = Encoding.Unicode.GetBytes(this.textBoxMessage.Text + "$");
            stream.Write(buffer, 0, buffer.Length);
            stream.Flush();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            clientSocket.Connect("192.168.0.12", 9999);
            stream = clientSocket.GetStream();

            message = "Connected to Chat Server";
            DisplayText(message);

            byte[] buffer = Encoding.Unicode.GetBytes(this.textBoxNickName.Text + "$");
            stream.Write(buffer, 0, buffer.Length);
            stream.Flush();

            Thread t_handler = new Thread(GetMessage);
            t_handler.IsBackground = true;
            t_handler.Start();
        }

        private void GetMessage()
        {
            while(true)
            {
                stream = clientSocket.GetStream();
                int BUFFERSIZE = clientSocket.ReceiveBufferSize;
                byte[] buffer = new byte[BUFFERSIZE];
                int bytes = stream.Read(buffer, 0, buffer.Length);

                string message = Encoding.Unicode.GetString(buffer, 0, bytes);
                DisplayText(message);
            }
        }

        private void DisplayText(string text)
        {
            if (richTextBox1.InvokeRequired)
            {
                richTextBox1.BeginInvoke(new MethodInvoker(delegate
                {
                    richTextBox1.AppendText(text + Environment.NewLine);
                }));
            }
            else
                richTextBox1.AppendText(text + Environment.NewLine);
        }
    }