using System;
using System.Net;
//引入支持socket的命名空間
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace TCPIP通信 {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }
    //聲明socket需要支持的對象
    public Socket ServerSocket;//監(jiān)聽
    public Socket SocketAccept;//綁定客戶端
    public Socket socket;//和客戶端通信

    #region 開啟監(jiān)聽
    Thread t1;//監(jiān)聽
    Thread t2;//接收

    //開啟監(jiān)聽(監(jiān)聽的是客戶端的鏈接)
    private void button1_Click(object sender, EventArgs e) {
      //實例化socket對象
      //參1：綁定一個ip地址，參2：數據流的格式，參3：協(xié)議
      ServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      //準備ip對象綁定ip地址
      IPAddress ip = IPAddress.Parse(textBox1.Text);
      //創(chuàng)建端口號
      int port = Convert.ToInt32(textBox2.Text);
      //把輸入的ip和端口傳入到連接中，嘗試鏈接
      IPEndPoint iPEndPoint = new IPEndPoint(ip, port);
      try {
        //開啟服務器的時候很容易報錯，所有做異常處理
        ServerSocket.Bind(iPEndPoint);
        //開啟監(jiān)聽(參數是監(jiān)聽的數量)
        ServerSocket.Listen(5);
        //禁用按鈕，避免重復監(jiān)聽
        button1.Enabled = false;
        //監(jiān)聽是持續(xù)的，所以要在分線程中進行
        t1 = new Thread(Listen);
        //設置成后臺線程
        t1.IsBackground = true;
        //分線程中開始對socket監(jiān)聽
        t1.Start(ServerSocket);
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }

    private void Listen(object o) {
      SocketAccept = o as Socket;
      try {
        //因為要持續(xù)監(jiān)聽，所以用了while循環(huán)
        while (true) {
          //阻塞線程，直到有客戶端進來的時候才會往下執(zhí)行
          socket = SocketAccept.Accept();
          //表示有客戶端進來了，需要顯示到textBox上面
          AddMsg(DateTime.Now.ToString("yyyy-mmddHHMMSS") + ":" + socket.RemoteEndPoint + "鏈接成功");
          //換行操作
          AddMsg("\r\n");
          //開啟第二個線程，用來檢測客戶端傳遞過來的消息
          t2 = new Thread(Receive);
          t2.IsBackground = true;
          t2.Start(socket);
        }
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }

    //接收消息的方法
    private void Receive(object obj) {
      socket = obj as Socket;
      try {
        while (true) {
          //定義字節(jié)，接收數據
          byte[] buffer = new byte[1024 * 1024 * 2];
          int r = socket.Receive(buffer);
          if (r == 0) {
            break;
          }
          string msg = Encoding.Default.GetString(buffer);
          AddMsg("他說：" + msg);
          AddMsg("\r\n");
        }
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }

    private void AddMsg(string msg) {
      //異步處理，否則沒辦法刷新ui
      richText.BeginInvoke(new Action<string>(str => {
        richText.Text += msg;
      }), msg);
    }
    #endregion

    //發(fā)送消息
    private void sendBtn_Click(object sender, EventArgs e) {
      //首先獲取要發(fā)送的消息
      string str = sendText.Text;
      byte[] buffer = Encoding.Default.GetBytes(str);
      try {
        socket.Send(buffer);
        AddMsg("我說：" + str);
        AddMsg("\r\n");
        sendText.Clear();
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }

    //關閉客戶端
    private void button2_Click(object sender, EventArgs e) {
      if (socket != null) {
        //禁掉socket的接收和發(fā)送
        socket.Shutdown(SocketShutdown.Both);
        socket.Close();
        t2.Abort();
      }
      ServerSocket.Close();
      SocketAccept.Close();
      t1.Abort();
      //打開監(jiān)聽的按鈕
      button1.Enabled = true;
    }
  }
}

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace _5_TCP客戶端 {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }

    //描述套字節(jié)對象
    public Socket clientSoket;
    public Socket socket;//和客戶端通信
    //創(chuàng)建一個線程。
    Thread t1;//接收消息

    //服務器鏈接
    private void conecBtn_Click(object sender, EventArgs e) {
      //初始化socket對象
      clientSoket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      //綁定IP
      IPAddress ip = IPAddress.Parse(ipTxt.Text);
      int port = Convert.ToInt32(portTxt.Text);
      //形成連接點
      IPEndPoint iPEndPoint = new IPEndPoint(ip, port);
      //嘗試與遠程主機鏈接
      try {
        clientSoket.Connect(iPEndPoint);
        AddMsg(DateTime.Now.ToString("HHmmss:") + "鏈接服務器");
        AddMsg("\r\n");
        conecBtn.Enabled = false;

        //開啟監(jiān)聽
        t1 = new Thread(Receive);
        t1.IsBackground = true;
        t1.Start(clientSoket);
      } catch (Exception ex) {
        MessageBox.Show("錯誤消息：" + ex.Message);
      }
    }

    //封裝一個顯示數據的方法
    private void AddMsg(string msg) {
      textBox4.BeginInvoke(new Action<string>(str => {
        textBox4.Text += str;
      }), msg);
    }

    //封裝一個接收消息的方法
    private void Receive(object o) {
      //當前聊天的對象
      Socket clientSocket = o as Socket;
      while (true) {
        try {
          //把字節(jié)轉成string
          byte[] buffer = new byte[1024 * 1024 * 2];
          int r = clientSocket.Receive(buffer);
          if (r == 0) {
            break;
          }
          string msg = Encoding.Default.GetString(buffer);
          AddMsg("接收到的消息：" + msg);
          AddMsg("\r\n");
        } catch (Exception ex) {
          MessageBox.Show(ex.Message);
        }
      }
    }

    //發(fā)送消息
    private void sendMsg_Click(object sender, EventArgs e) {
      byte[] buffer = new byte[1024 * 1024 * 2];
      string str = textBox3.Text;
      //轉碼
      buffer = Encoding.Default.GetBytes(str);
      //發(fā)
      try {
        clientSoket.Send(buffer);
        AddMsg(str);
        AddMsg("\r\n");
        textBox3.Clear();
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }

    //斷開連接
    private void button2_Click(object sender, EventArgs e) {
      if (clientSoket != null) {
        //禁掉socket的接收和發(fā)送
        clientSoket.Shutdown(SocketShutdown.Both);
        clientSoket.Close();
        t1.Abort();
      }
      t1.Abort();
      //打開監(jiān)聽的按鈕
      conecBtn.Enabled = true;
    }
  }
}