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c# socket 通信问题

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悬赏园豆:5 [已关闭问题] 关闭于 2009-03-19 23:17

服务器端代码:

  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, 0new 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, 0new 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 }


客户端代码:

  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, 0new 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, 0new 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(thisnull);
120             }
121         }
122 
123 
124 
125 
126     }
127 }

这是园中的个例子,今天拿来调试发现个问题,就开启多个客户端进行通行没有问题,然后断开最开始的启动的客户端后,起他的客户端就不能发送信息了!我刚开始学网络通信,望高手多多指点!

清崽的主页 清崽 | 初学一级 | 园豆:121
提问于:2009-03-18 23:00
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所有回答(1)
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服务器端异常没有处理好?

波波塔 | 园豆:638 (小虾三级) | 2009-03-19 08:45
我觉得这个问题是 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.");这里是不是 用同一个缓冲区接受 不同的客户端发过来的消息,我感觉不靠谱啊,你试试用不同的缓冲区去接收不同客户端发过来的消息
支持(0) 反对(0) UC_web | 园豆:200 (初学一级) | 2011-07-16 10:48
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