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프로그램 설명

msdn 에 있는 예제를 가지고 만든 버전입니다.

TcpListener 클래스 

http://msdn.microsoft.com/ko-kr/library/system.net.sockets.tcplistener(v=vs.110).aspx

TcpClient 클래스

http://msdn.microsoft.com/ko-kr/library/system.net.sockets.tcpclient(v=vs.110).aspx

클라이언트 버전은 사용자 입력을 반복적으로 입력받을 수 있게 수정했습니다.

클라이언트의 메시지를 서버가 받아서 대문자로 변경해 주는 작업만 처리합니다.

실행 후

메시지 전송 후

프로그램 작성 순서

1. 소켓/쓰레드과 관련한 네임스페이스를 서버/클라이언트 모두에 포함 시킵니다.

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Diagnostics;

2. 서버 프로그램

        TcpListener server = null;
 
        public MainForm()
        {
            InitializeComponent();
            FormClosing += new FormClosingEventHandler(Form_Closing);
        }

        private void Form_Closing(object sender, FormClosingEventArgs e)
        {
            if (server != null)
                server = null;

            Application.Exit();
        }
        
        private void btnListen_Click(object sender, EventArgs e)
        {
            new Thread(delegate()
                {
                    try
                    {
                        // Set the TcpListener on port 14000.
                        Int32 port = 14000;
                        IPAddress localAddr = IPAddress.Parse("127.0.0.1");

                        // TcpListener server = new TcpListener(port);
                        server = new TcpListener(localAddr, port);
                        server.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

                        // Start listening for client requests.
                        server.Start();

                        // Buffer for reading data
                        Byte[] bytes = new Byte[256];
                        String data = null;
                        
                        // Enter the listening loop.
                        while (true)
                        {
                            Invoke((MethodInvoker)delegate
                            {
                                listBox1.Items.Add("Waiting for a connection... ");
                            });

                            // Perform a blocking call to accept requests.
                            // You could also user server.AcceptSocket() here.
                            TcpClient client = server.AcceptTcpClient();
                            Invoke((MethodInvoker)delegate
                            {
                                listBox1.Items.Add("Connected!");
                            });

                            data = null;

                            // Get a stream object for reading and writing
                            NetworkStream stream = client.GetStream();

                            int i;

                            // Loop to receive all the data sent by the client.
                            while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
                            {
                                // Translate data bytes to a ASCII string.
                                data = System.Text.Encoding.UTF8.GetString(bytes, 0, i);
                                Invoke((MethodInvoker)delegate
                                {
                                    listBox1.Items.Add(string.Format("Received: {0}", data));
                                });

                                // Process the data sent by the client.
                                data = data.ToUpper();

                                byte[] msg = System.Text.Encoding.UTF8.GetBytes(data);

                                // Send back a response.
                                stream.Write(msg, 0, msg.Length);
                                Invoke((MethodInvoker)delegate
                                {
                                    listBox1.Items.Add(string.Format("Sent: {0}", data));
                                    listBox1.Items.Add("");
                                });
                            }

                            // Shutdown and end connection
                            client.Close();
                        }  // end of outer while                    
                    }
                    catch (SocketException se)
                    {
                        MessageBox.Show(string.Format("SocketException: {0}", se.Message.ToString()));
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(string.Format("Exception: {0}", ex.Message.ToString()));
                    }
                    finally
                    {
                        // Stop listening for new clients.
                        server.Stop();
                    }
            }).Start();
        }

2. 클라이언트 프로그램

        private void btnSend_Click(object sender, EventArgs e)
        {
            string serverIP = textServerIP.Text;
            string sendData = textMessage.Text;

            SendMessage(serverIP, sendData);
        }

        private void SendMessage(string server, string message)
        {
            try
            {
                // Create a TcpClient.
                // Note, for this client to work you need to have a TcpServer 
                // connected to the same address as specified by the server, port
                // combination.
                Int32 port = 14000;
                TcpClient client = new TcpClient(server, port);

                // Translate the passed message into ASCII and store it as a Byte array.
                Byte[] data = System.Text.Encoding.UTF8.GetBytes(message);

                // Get a client stream for reading and writing.
                //  Stream stream = client.GetStream();

                NetworkStream stream = client.GetStream();

                // Send the message to the connected TcpServer. 
                stream.Write(data, 0, data.Length);

                Invoke((MethodInvoker)delegate
                {
                    listBox1.Items.Add(string.Format("Sent: {0}", message));
                });

                // Receive the TcpServer.response.

                // Buffer to store the response bytes.
                data = new Byte[256];

                // String to store the response ASCII representation.
                String responseData = String.Empty;

                // Read the first batch of the TcpServer response bytes.
                Int32 bytes = stream.Read(data, 0, data.Length);
                responseData = System.Text.Encoding.UTF8.GetString(data, 0, bytes);
                Invoke((MethodInvoker)delegate
                {
                    listBox1.Items.Add(string.Format("Received: {0}", responseData));
                    listBox1.Items.Add("");
                });

                // Close everything.
                stream.Close();
                client.Close();
            }
            catch (ArgumentNullException e)
            {
                MessageBox.Show(string.Format("ArgumentNullException: {0}", e.Message.ToString()));
            }
            catch (SocketException e)
            {
                MessageBox.Show(string.Format("SocketException: {0}", e.Message.ToString()));
            }
        }