[C#] Socket 通讯，一个简单的聊天窗口小程序

　　Socket，这玩意，当时不会的时候，抄别人的都用不好，简单的一句话形容就是“笨死了”；也是很多人写的太复杂，不容易理解造成的。最近在搞erlang和C的通讯，也想试试erlang是不是可以和C#简单通讯，就简单的做了些测试用例，比较简单，觉得新手也可以接受。

 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.Net;
 using System.Threading;

 namespace ChatClient
 {
     public partial class Form1 : Form
     {
         private System.Windows.Forms.RichTextBox richTextBox1;
         private System.Windows.Forms.TextBox textBox1;
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// 服务端侦听端口
         /// </summary>
         private const int _serverPort = ;
         /// <summary>
         /// 客户端侦听端口
         /// </summary>
         private const int _clientPort = ;
         /// <summary>
         /// 缓存大小
         /// </summary>
         private const int _bufferSize = ;
         /// <summary>
         /// 服务器IP
         /// </summary>
         private const string ServerIP = "172.17.47.199";  //手动修改为指定服务器ip

         private Thread thread;

         private void Form1_Load(object sender, EventArgs e)
         {
             thread = new Thread(new ThreadStart(delegate { Listenning(); }));
             thread.Start();
         }

         void textBox_KeyUp(object sender, KeyEventArgs e)
         {
             if (e.KeyCode == Keys.Enter)
             {
                 string msg;
                 if ((msg = textBox1.Text.Trim()).Length > )
                 {
                     SendMessage(msg);
                 }
                 textBox1.Clear();
             }
         }

         void SendMessage(string msg)
         {
             try
             {
                 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                 IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(ServerIP), _serverPort);
                 socket.Connect(endPoint);
                 byte[] buffer = System.Text.ASCIIEncoding.UTF8.GetBytes(msg);
                 socket.Send(buffer);
                 socket.Close();
             }
             catch
             { }
         }

         void Listenning()
         {
             TcpListener listener = new TcpListener(_clientPort);
             listener.Start();
             while (true)
             {
                 Socket socket = listener.AcceptSocket();
                 byte[] buffer = new byte[_bufferSize];
                 socket.Receive(buffer);
                 int lastNullIndex = _bufferSize - ;
                 while (true)
                 {
                     if (buffer[lastNullIndex] != '\0')
                         break;
                     lastNullIndex--;
                 }
                 string msg = Encoding.UTF8.GetString(buffer, , lastNullIndex + );
                 WriteLine(msg);
                 socket.Close();
             }
         }

         void WriteLine(string msg)
         {
             this.Invoke(new MethodInvoker(delegate
             {
                 this.richTextBox1.AppendText(msg + Environment.NewLine);
             }));
         }

         public Form1()
         {
             this.richTextBox1 = new System.Windows.Forms.RichTextBox();
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.SuspendLayout();
             //
             // richTextBox1
             //
             this.richTextBox1.Location = new System.Drawing.Point(, );
             this.richTextBox1.Name = "richTextBox1";
             this.richTextBox1.Size = new System.Drawing.Size(, );
             this.richTextBox1.TabIndex = ;
             this.richTextBox1.Text = "";
             this.richTextBox1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.textBox_KeyUp);
             //
             // textBox1
             //
             this.textBox1.Location = new System.Drawing.Point(, );
             this.textBox1.Multiline = true;
             this.textBox1.Name = "textBox1";
             this.textBox1.Size = new System.Drawing.Size(, );
             this.textBox1.TabIndex = ;
             this.textBox1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.textBox_KeyUp);
             //
             // Form1
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(, );
             this.Controls.Add(this.richTextBox1);
             this.Controls.Add(this.textBox1);
             this.Name = "Form1";
             this.Text = "Form1";
             this.Load += new System.EventHandler(this.Form1_Load);
             this.ResumeLayout(false);
             this.PerformLayout();
         }

         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }
     }
 }

Client端

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Diagnostics;
 using System.Linq;
 using System.ServiceProcess;
 using System.Text;
 using System.Net;
 using System.Net.Sockets;
 using System.Collections;

 namespace ChatService
 {
     public partial class Service1 : ServiceBase
     {
         /// <summary>
         /// 服务端侦听端口
         /// </summary>
         private const int _serverPort = ;
         /// <summary>
         /// 客户端侦听端口
         /// </summary>
         private const int _clientPort = ;
         /// <summary>
         /// 缓存大小
         /// </summary>
         private const int _bufferSize = ;
         /// <summary>
         /// 服务器IP
         /// </summary>
         private const string ServerIP = "172.17.47.199";  //手动修改为指定服务器ip
         /// <summary>
         /// 客户端IP
         /// </summary>
         //private Hashtable ServerIPs = new Hashtable();  //存放ip + port
         private List<string> ServerIPs = new List<string>();

         public Service1()
         {
             //InitializeComponent();   //从控制台改为服务，需要注释下面的一行，打开本行
             Listenning();
         }

         void SendMessage(string from, string msg)
         {

             for (int i = ServerIPs.Count - ; i >= ; i--)
             {
                 try
                 {
                     Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                     IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(ServerIPs[i]), _clientPort);
                     socket.Connect(endPoint);
                     byte[] buffer = System.Text.ASCIIEncoding.UTF8.GetBytes((from + " say: " + msg).Trim());
                     socket.Send(buffer);
                     socket.Close();
                 }
                 catch
                 {
                     ServerIPs.RemoveAt(i);
                 }
             }
         }

         void Listenning()
         {

             TcpListener listener = new TcpListener(_serverPort);
             listener.Start();
             while (true)
             {
                 Socket socket = listener.AcceptSocket();
                 var s = socket.RemoteEndPoint.ToString();
                 var ipstr = s.Substring(, s.IndexOf(":"));

                 if (!ServerIPs.Contains(ipstr))
                 {
                     ServerIPs.Add(ipstr);
                 }

                 byte[] buffer = new byte[_bufferSize];
                 socket.Receive(buffer);
                 int lastNullIndex = _bufferSize - ;

                 while (true)
                 {
                     if (buffer[lastNullIndex] != '\0')
                         break;
                     lastNullIndex--;
                 }
                 string msg = Encoding.UTF8.GetString(buffer, , lastNullIndex + );
                 SendMessage(ipstr,msg);
                 Console.WriteLine(msg);//服务模式下关闭
             }
         }

         protected override void OnStart(string[] args)
         {
             Listenning();
         }

         protected override void OnStop()
         {

         }
     }
 }

Server端

逻辑视图（比较简单）：

1.左上角的是一个远程客户端，右上角是本地客户端，右下角是本地服务端（暂时改为控制台程序）

2.这段程序只给不懂得如何用socket玩玩

3.这里面剔除了数据加密、异步获取等繁杂的过程，想要学习可以参照：http://yunpan.cn/cKT2ZHdKRMILz  访问密码 b610