[Program C#] 서버-클라이언트 1:N 통신

프로그램 설명

1:1 통신에 이어서 1:N 통신을 다루는 프로그램입니다.

각 클라이언트 소켓마다 쓰레드를 만들어서 통신하는 방법입니다.

실행 후

메신지 전송 후

프로그램 작성 순서

1. 서버 사이드 소켓 핸들 (handleClient.cs)

    class handleClient
    {
        TcpClient clientSocket;
        int clientNo;

        public void startClient(TcpClient ClientSocket, int clientNo)
        {
            this.clientSocket = ClientSocket;
            this.clientNo = clientNo;

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

        public delegate void MessageDisplayHandler(string text);
        public event MessageDisplayHandler OnReceived;

        public delegate void CalculateClientCounter();
        public event CalculateClientCounter OnCalculated;

        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("$"));
                    msg = "Data Received : " + msg;

                    if (OnReceived != null)
                        OnReceived(msg);

                    msg = "Server to client(" + clientNo.ToString() + ") " + MessageCount.ToString();
                    if (OnReceived != null)
                        OnReceived(msg);

                    byte[] sbuffer = Encoding.Unicode.GetBytes(msg);
                    stream.Write(sbuffer, 0, sbuffer.Length);
                    stream.Flush();

                    msg = " >> " + msg;
                    if (OnReceived != null) { 
                        OnReceived(msg);
                        OnReceived("");
                    }
                }
            }
            catch(SocketException se)
            {
                Trace.WriteLine(string.Format("doChat - SocketException : {0}", se.Message));

                if (clientSocket != null)
                {
                    clientSocket.Close();
                    stream.Close();
                }

                if (OnCalculated != null)
                    OnCalculated();
            }
            catch (Exception ex)
            {
                Trace.WriteLine(string.Format("doChat - Exception : {0}", ex.Message));

                if (clientSocket != null)
                {
                    clientSocket.Close();
                    stream.Close();
                }

                if (OnCalculated != null)
                    OnCalculated();
            }
        }
    }

2. 서버 프로그램

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

        public MainForm()
        {
            InitializeComponent();

            // socket start
            Thread t = new Thread(InitSocket);
            t.IsBackground = true;
            t.Start();
        }
        
        private void InitSocket()
        {
            server = new TcpListener(IPAddress.Any, 9999);
            client = default(TcpClient);
            server.Start();
            DisplayText(">> Server Started");

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

                    handleClient h_client = new handleClient();
                    h_client.OnReceived += new handleClient.MessageDisplayHandler(DisplayText);
                    h_client.OnCalculated += new handleClient.CalculateClientCounter(CalculateCounter);
                    h_client.startClient(client, counter);
                }
                catch (SocketException se)
                {
                    Trace.WriteLine(string.Format("InitSocket - SocketException : {0}", se.Message));
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(string.Format("InitSocket - Exception : {0}", ex.Message));
                }
            }        
        }

        private void CalculateCounter()
        {
            counter--;
        }

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

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (client != null)
            {
                client.Close();
                client = null;
            }

            if (server != null)
            {
                server.Stop();
                server = null;
            }
        }
    }

3. 클라이언트 프로그램

    public partial class MainForm : Form
    {
        TcpClient clientSocket = new TcpClient();

        public MainForm()
        {
            InitializeComponent();

            new Thread(delegate()
                {
                    InitSocket();
                }).Start();            
        }

        private void InitSocket()
        {
            try
            {
                clientSocket.Connect("192.168.0.12", 9999);
                DisplayText("Client Started");
                labelStatus.Text = "Client Socket Program - Server Connected ...";
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message, "Error");                
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error");
            }
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            NetworkStream stream = clientSocket.GetStream();
            byte[] sbuffer = Encoding.Unicode.GetBytes(richTextBox2.Text + "$");
            stream.Write(sbuffer, 0, sbuffer.Length);
            stream.Flush();

            byte[] rbuffer = new byte[1024];
            stream.Read(rbuffer, 0, rbuffer.Length);
            string msg = Encoding.Unicode.GetString(rbuffer);
            msg = "Data from Server : " + msg;
            DisplayText(msg);

            richTextBox2.Text = "";
            richTextBox2.Focus();
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (clientSocket != null)
                clientSocket.Close();
        }

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