C# Socket thread

The original version is like this: click to open the link. But it has never been adjusted properly, so I consulted my colleague Xiang Ge and finally got it right!

Client code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
using System.Net;
using System.Diagnostics;

namespace SocketClient
{
    public partial class Client : Form
    {    
        Socket vsServerSocket;
        Thread vsClientThread;
        string strIP = "127.0.0.1";
        public delegate void PassString(string strMsg);
        int nPort = 9001;
        public Client()
        {
            InitializeComponent();
        }
        public void SetSendData(string strMsg)
        {
            if (tBoxClientSend.InvokeRequired == true)
            {
                PassString d = new PassString(SetSendData);
                this.Invoke(d, new object[] { strMsg });
            }
            else
            {
                tBoxClientSend.Text = strMsg;
            }
        }
        public void SetRecvData(string strMsg)
        {
            if (tBoxClientReceive.InvokeRequired == true)
            {
                PassString d = new PassString(SetRecvData);
                this.Invoke(d, new object[] { strMsg });
            }
            else
            {
                tBoxClientReceive.Text = strMsg;
            }
        }
        private void ClientHandle()
        {
            string strRecv = string.Empty;
            //IPEndPoint其实就是一个IP地址和端口的绑定，可以代表一个服务，用来Socket通讯。
            //IPAddress类中有一个 Parse()方法，可以把点分的十进制IP表示转化成IPAddress类
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(strIP), nPort);
            //创建套接字实例
            //这里创建的时候用ProtocolType.Tcp，表示建立一个面向连接(TCP)的Socket
            vsServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                //将所创建的套接字与IPEndPoint绑定
                vsServerSocket.Bind(ipep);
            }
            catch (SocketException ex)
            {
                MessageBox.Show("Connect Error: " + ex.Message);
                return;
            }
            Byte[] buffer = new Byte[1024];
            //设置套接字为收听模式
            vsServerSocket.Listen(10);
            //循环监听   
            while (true)
            {
                //接收服务器信息
                int bufLen = 0;               
                try
                {
                    Socket vsClientSocket = vsServerSocket.Accept();
                    bufLen=vsClientSocket.Receive(buffer);
                    vsClientSocket.Send(Encoding.ASCII.GetBytes("aaaaa"), 5, SocketFlags.None);
                  
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Receive Error:" + ex.Message);                   
                }
                strRecv = Encoding.ASCII.GetString(buffer, 0, bufLen);
                SetRecvData(strRecv);                
                //vsClientSocket.Shutdown(SocketShutdown.Both);
                //vsClientSocket.Close();
            }
        }

        //发送数据
        private void btnSend_Click(object sender, EventArgs e)
        {
            byte[] data = new byte[1024];
            string ss = tBoxClientSend.Text;
            Socket centerClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint GsServer = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9002);
            centerClient.Connect(GsServer);
            centerClient.Send(Encoding.ASCII.GetBytes(ss));
            centerClient.Close();
        }

        private void Client_Load(object sender, EventArgs e)
        {
            //连接服务器
            //通过ThreadStart委托告诉子线程讲执行什么方法
            vsClientThread = new Thread(new ThreadStart(ClientHandle));
            vsClientThread.Start();
        }
        //窗体关闭时杀死客户端进程
        private void Client_FormClosing(object sender, FormClosingEventArgs e)
        {
            KillProcess();
        }
        //杀死客户端进程
        private void KillProcess()
        {
            Process[] processes = Process.GetProcessesByName("SocketClient");
            foreach (Process process in processes)
            {
                process.Kill();
                break;
            }
        }
    }
}

Server code:

# #

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.Sockets;
using System.Net;
using System.Diagnostics;
namespace SocketServer
{
    public partial class Server : Form
    {
        Thread vsServerThread;
        Socket vsServerSocket;      
        string strIP = "127.0.0.1";
        public delegate void PassString(string strMsg);     
        int nPort = 9002;
        public Server()
        {
            InitializeComponent();
        }
        private void SeverSendData(string strMsg)
        {
            //Control.InvokeRequired 属性,命名空间：  System.Windows.Forms
            //获取一个值，该值指示调用方在对控件进行方法调用时是否必须调用 Invoke 方法，因为调用方位于创建控件所在的线程以外的线程中。
            if (tBoxServerSend.InvokeRequired == true)
            {
                //Control.Invoke 方法 (Delegate)
                //在拥有此控件的基础窗口句柄的线程上执行指定的委托。
                PassString d = new PassString(SeverSendData);
                this.Invoke(d, new object[] { strMsg });
            }
            else
            {
                tBoxServerSend.Text = strMsg;
            }
        }
        private void SeverRecvData(string strMsg)
        {
            if (tBoxServerReceive.InvokeRequired == true)
            {
                PassString d = new PassString(SeverRecvData);
                this.Invoke(d, new object[] { strMsg });
            }
            else
            {
                tBoxServerReceive.Text = strMsg;
            }
        }       
        private void ServerStart()
        {
            string strRecv = string.Empty;
            //创建IPEndPoint实例
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(strIP), nPort);
            //创建一个套接字
            vsServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //将所创建的套接字与IPEndPoint绑定
            try
            {
                vsServerSocket.Bind(ipep);
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.ToString());
                return;
            }
            //设置套接字为收听模式
            vsServerSocket.Listen(10);
            int bufLen = 0;
            //循环监听  
            while (true)
            {
                //在套接字上接收接入的连接
                Socket vsClientSocket = vsServerSocket.Accept();     
                try
                {                                  
                    Byte[] buffer = new Byte[1024];
                    //在套接字上接收客户端发送的信息
                    bufLen = vsClientSocket.Receive(buffer);
                    vsClientSocket.Send(Encoding.ASCII.GetBytes("aaaaa"), 5, SocketFlags.None);
                    if (bufLen == 0)
                        continue;   
                    //将指定字节数组中的一个字节序列解码为一个字符串。
                    strRecv = Encoding.ASCII.GetString(buffer, 0, bufLen);
                    SeverRecvData(strRecv.ToString());
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Listening Error: " + ex.Message);
                    vsClientSocket.Close();
                    vsServerSocket.Close();
                }
            }
        }
        private void btnSend_Click(object sender, EventArgs e)
        {
            byte[] data = new byte[1024];
            string ss = tBoxServerSend.Text;
            Socket centerClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint GsServer = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9001);
            centerClient.Connect(GsServer);
            centerClient.Send(Encoding.ASCII.GetBytes(ss));
            centerClient.Send(Encoding.ASCII.GetBytes(ss));
            //Thread.Sleep(100);
            //centerClient.Close();
        }
        private void Server_Load(object sender, EventArgs e)
        {
            vsServerThread = new Thread(new ThreadStart(ServerStart));
            vsServerThread.Start();
        }
        //窗体关闭时杀死客户端进程
        private void Server_FormClosing(object sender, FormClosingEventArgs e)
        {
            KillProcess();
        }
        //杀死客户端进程
        private void KillProcess()
        {
            Process[] processes = Process.GetProcessesByName("Server");
            foreach (Process process in processes)
            {
                process.Kill();
                break;
            }
        }
    }
}

The effect is as follows:

The client can send messages to the server, and the server can also send messages to the client.

Disadvantages:

Now the server can only connect to one client

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