C#使用SOCKET编程实现服务器+客户端的聊天程序示例(转)

1 C#使用SOCKET编程实现服务器+客户端的聊天程序示例
[日期：2009-12-28] 来源：     作者： [字体：大 中 小]


本文使用SOCKET编程实现聊天程序，不基于P2P技术。

首先，本文主要是针对那些刚接触SOCKET编程的朋友，将介绍的是一个服务器端+客户端的聊天系统，比较简单，入门级别的，先来看下效果界面.
上面是服务器端运行界面；下面把客户端界面贴给大家看下：

功能看起来是比较简单。服务器的端口号可以在“系统菜单”里面的参数配置进行修改的。

下面开始讲下如何实现上面聊天的功能吧。直接上代码：

服务端代码如下：


C# Code [http://www.oeedu.com]


1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Text;
  7 using System.Windows.Forms;
  8
  9 using System.Net;
10 using System.Net.Sockets;
11 using System.Threading;
12 using System.Xml;
13
14 namespace Server
15 {
16     public partial class ServerMain : Form
17     {
18         public ServerMain()
19         {
20             InitializeComponent();
21         }
22
23         private void ServerMain_Load(object sender, EventArgs e)
24         {
25             this.CmdStar.Enabled = true;
26             this.CmdStop.Enabled = false;
27         }
28
29         private void 配置参数ToolStripMenuItem_Click(object sender, EventArgs e)
30         {
31             Set TSet = new Set();
32             TSet.ShowDialog();
33         }
34
35         private void 关于ToolStripMenuItem_Click(object sender, EventArgs e)
36         {
37             About TAbout = new About();
38             TAbout.Show();
39         }
40         /// <summary>
41         /// 获得XML文件中的端口号
42         /// </summary>
43         /// <returns></returns>
44         private int GetPort()
45         {
46             try
47             {
48                 XmlDocument TDoc = new XmlDocument();
49                 TDoc.Load("Settings.xml");
50                 string TPort = TDoc.GetElementsByTagName("ServerPort")[0].InnerXml;
51                 return Convert.ToInt32(TPort);
52
53             }
54             catch { return 6600; }//默认是6600
55         }
56
57         //声明将要用到的类
58         private IPEndPoint ServerInfo;//存放服务器的IP和端口信息
59         private Socket ServerSocket;//服务端运行的SOCKET
60         private Thread ServerThread;//服务端运行的线程
61         private Socket[] ClientSocket;//为客户端建立的SOCKET连接
62         private int ClientNumb;//存放客户端数量
63         private byte[] MsgBuffer;//存放消息数据
64
65         private void CmdStar_Click(object sender, EventArgs e)
66         {
67             ServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
68             ServerInfo=new IPEndPoint(IPAddress.Any,this.GetPort());
69             ServerSocket.Bind(ServerInfo);//将SOCKET接口和IP端口绑定
70             ServerSocket.Listen(10);//开始监听，并且挂起数为10
71
72             ClientSocket = new Socket[65535];//为客户端提供连接个数
73             MsgBuffer = new byte[65535];//消息数据大小
74             ClientNumb = 0;//数量从0开始统计
75
76             ServerThread = new Thread(RecieveAccept);//将接受客户端连接的方法委托给线程
77             ServerThread.Start();//线程开始运行
78
79             CheckForIllegalCrossThreadCalls = false;//不捕获对错误线程的调用
80
81             this.CmdStar.Enabled = false;
82             this.CmdStop.Enabled = true;
83             this.StateMsg.Text = "服务正在运行" "  运行端口：" this.GetPort().ToString();
84             this.ClientList.Items.Add("服务于 "   DateTime.Now.ToString()   " 开始运行.");
85         }
86        
87         //接受客户端连接的方法
88         private void RecieveAccept()
89         {
90             while (true)
91             {
92                 ClientSocket[ClientNumb] = ServerSocket.Accept();
93                 ClientSocket[ClientNumb].BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(RecieveCallBack),ClientSocket[ClientNumb]);
94                 this.ClientList.Items.Add(ClientSocket[ClientNumb].RemoteEndPoint.ToString() " 成功连接服务器.");
95                 ClientNumb  ;
96             }
97         }
98
99         //回发数据给客户端
100         private void RecieveCallBack(IAsyncResult AR)
101         {
102             try
103             {
104                 Socket RSocket = (Socket)AR.AsyncState;
105                 int REnd = RSocket.EndReceive(AR);
106                 for (int i = 0; i < ClientNumb; i  )
107                 {
108                     if (ClientSocket[i].Connected)
109                     {
110                         ClientSocket[i].Send(MsgBuffer, 0, REnd,0);
111                     }
112                     RSocket.BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(RecieveCallBack), RSocket);
113
114                 }
115             }
116             catch { }
117
118         }
119
120         private void CmdStop_Click(object sender, EventArgs e)
121         {
122             ServerThread.Abort();//线程终止
123             ServerSocket.Close();//关闭SOCKET
124
125             this.CmdStar.Enabled = true;
126             this.CmdStop.Enabled = false;
127             this.StateMsg.Text = "等待运行";
128             this.ClientList.Items.Add("服务于 "   DateTime.Now.ToString()   " 停止运行.");
129         }
130
131
132
133     }
134 }



好，看完服务端代码，接下我们来看下客户端的代码又是如何实现的？



客户端代码：


C# Code [http://www.oeedu.com]


1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Text;
  7 using System.Windows.Forms;
  8
  9 using System.Net;
10 using System.Net.Sockets;
11
12 namespace Client
13 {
14     public partial class ClientMain : Form
15     {
16         public ClientMain()
17         {
18             InitializeComponent();
19         }
20
21         private IPEndPoint ServerInfo;
22         private Socket ClientSocket;
23         private Byte[] MsgBuffer;
24         private Byte[] MsgSend;
25
26         private void ClientMain_Load(object sender, EventArgs e)
27         {
28             this.CmdSend.Enabled = false;
29             this.CmdExit.Enabled = false;
30
31             ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
32             MsgBuffer = new Byte[65535];
33             MsgSend = new Byte[65535];
34             CheckForIllegalCrossThreadCalls = false;
35
36             Random TRand=new Random();
37             this.UserName.Text = "用户"   TRand.Next(10000).ToString();
38         }
39
40         private void CmdEnter_Click(object sender, EventArgs e)
41         {
42             ServerInfo = new IPEndPoint(IPAddress.Parse(this.ServerIP.Text), Convert.ToInt32(this.ServerPort.Text));
43
44             try
45             {
46                 ClientSocket.Connect(ServerInfo);
47
48                 ClientSocket.Send(Encoding.Unicode.GetBytes("用户： "   this.UserName.Text   " 进入系统！\n"));
49
50                 ClientSocket.BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(ReceiveCallBack), null);
51
52                 this.SysMsg.Text  = "登录服务器成功！\n";
53                 this.CmdSend.Enabled = true;
54                 this.CmdEnter.Enabled = false;
55                 this.CmdExit.Enabled = true;
56             }
57             catch
58             {
59                 MessageBox.Show("登录服务器失败，请确认服务器是否正常工作！");
60             }
61         }
62
63         private void ReceiveCallBack(IAsyncResult AR)
64         {
65             try
66             {
67                 int REnd = ClientSocket.EndReceive(AR);
68                 this.RecieveMsg.AppendText(Encoding.Unicode.GetString(MsgBuffer, 0, REnd));
69                 ClientSocket.BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(ReceiveCallBack), null);
70
71             }
72             catch
73             {
74                 MessageBox.Show("已经与服务器断开连接！");
75                 this.Close();
76             }
77
78         }
79
80         private void CmdSend_Click(object sender, EventArgs e)
81         {
82             MsgSend = Encoding.Unicode.GetBytes(this.UserName.Text   "说：\n"   this.SendMsg.Text   "\n");
83             if (ClientSocket.Connected)
84             {
85                 ClientSocket.Send(MsgSend);
86                 this.SendMsg.Text = "";
87             }
88             else
89             {
90                 MessageBox.Show("当前与服务器断开连接，无法发送信息！");
91             }
92         }
93
94         private void CmdExit_Click(object sender, EventArgs e)
95         {
96             if (ClientSocket.Connected)
97             {
98                 ClientSocket.Send(Encoding.Unicode.GetBytes(this.UserName.Text   "离开了房间！\n"));
99                 ClientSocket.Shutdown(SocketShutdown.Both);
100                 ClientSocket.Disconnect(false);
101             }
102             ClientSocket.Close();
103
104             this.CmdSend.Enabled = false;
105             this.CmdEnter.Enabled = true;
106             this.CmdExit.Enabled = false;
107         }
108
109         private void RecieveMsg_TextChanged(object sender, EventArgs e)
110         {
111             this.RecieveMsg.ScrollToCaret();
112         }
113
114         private void SendMsg_KeyDown(object sender, KeyEventArgs e)
115         {
116             if (e.Control && e.KeyValue == 13)
117             {
118                 e.Handled = true;
119                 this.CmdSend_Click(this, null);
120             }
121         }
122
123
124
125
126     }
127 }



我只对服务器端的代码做了注释，客户端就没有写注释了，因为代码是差不多的。区别在于客户端不需要监听，也不需要启用线程进行委托。
关于 ServerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这句代码，我想给初学者解释一下，这里“AddressFamily.InterNetwork”表示的是使用IPV4地址，“SocketType.Stream”表示使用的是流格式（另外还有数据包格式和原始套接字格式），“ProtocolType.Tcp”表示使用TCP协议（另外还有很多其它协议，例如大家常看到的UDP协议）。
另外关于SOCKET类中的BeginReceive方法，请大家参考MSDN，里面有详细说明。

下面是Settings.xml内容


XML Code [http://www.oeedu.com]


<?xml version="1.0" encoding="utf-8" ?>
<Server>
  <ServerPort>6600</ServerPort>
</Server>



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