[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 = 8707;
        /// <summary>
        /// 客户端侦听端口
        /// </summary>
        private const int _clientPort = 8708;
        /// <summary>
        /// 缓存大小
        /// </summary>
        private const int _bufferSize = 1024;
        /// <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 > 0)
                {
                    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 - 1;
                while (true)
                {
                    if (buffer[lastNullIndex] != '\0')
                        break;
                    lastNullIndex--;
                }
                string msg = Encoding.UTF8.GetString(buffer, 0, lastNullIndex + 1);
                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(1, 2);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(282, 188);
            this.richTextBox1.TabIndex = 3;
            this.richTextBox1.Text = "";
            this.richTextBox1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.textBox_KeyUp);
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(3, 196);
            this.textBox1.Multiline = true;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(277, 65);
            this.textBox1.TabIndex = 2;
            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(284, 262);
            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);
        }
    }
}

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 = 8707;
        /// <summary>
        /// 客户端侦听端口
        /// </summary>
        private const int _clientPort = 8708;
        /// <summary>
        /// 缓存大小
        /// </summary>
        private const int _bufferSize = 1024;
        /// <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 - 1; i >= 0; 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(0, s.IndexOf(":"));

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

                byte[] buffer = new byte[_bufferSize];
                socket.Receive(buffer);
                int lastNullIndex = _bufferSize - 1;

                while (true)
                {
                    if (buffer[lastNullIndex] != '\0')
                        break;
                    lastNullIndex--;
                }
                string msg = Encoding.UTF8.GetString(buffer, 0, lastNullIndex + 1);
                SendMessage(ipstr,msg);
                Console.WriteLine(msg);//服务模式下关闭
            }
        }

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

        protected override void OnStop()
        {

        }
    }
}

 

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