TCP监听套接字错误

问题描述：

我有2个程序，客户端和服务器，客户端程序通过TCP协议发送特定端口的数据（EX：1370）。
我使用下面的代码来等待我的服务器程序中的客户端。TCP监听套接字错误

IPAddress IP = (my IP Address); 
IPEndPoint ipep = new IPEndPoint(IP, 1370); 

listenSocket = new Socket(AddressFamily.InterNetwork, 
          SocketType.Stream, 
          ProtocolType.Tcp); 
listenSocket.Bind((EndPoint) ipep); 
listenSocket.BeginReceive(clientData, 0, clientData.Length, 
          SocketFlags.None, new AsyncCallback(OnReceiveClient), null);

我在最后一行发生错误，socket无法接收TCP协议中的数据。这段代码在UDP协议中工作得很好。你能帮我吗？！（感谢）

“我有一个错误” 是很模糊的 - 你可以提供更多的细节？ – 2012-08-03 09:19:16

侦听套接字通常用于接受连接，而不是接收数据。 UDP的交互与TCP的交互不同。你可能想看看这样的东西：http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener.aspx – forsvarir 2012-08-03 09:27:58

乔恩，错误是：“一个请求发送或接收数据被禁止，因为套接字未连接，并且（当使用sendto调用在数据报套接字上发送时）没有提供地址“ – user1518295 2012-08-03 09:28:58

答

代码应该是这样的

IPAddress IP = (my IP Address); 
listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 

IPEndPoint ipep = new IPEndPoint(IP, 1370); 
listenSocket.Bind((EndPoint) ipep); 

listenSocket.Listen(4); 
// Create the call back for any client connections... 
listenSocket.BeginAccept(new AsyncCallback (OnClientConnect), null);

，一旦客户端连接

// This is the call back function, which will be invoked when a client is connected 
public void OnClientConnect(IAsyncResult asyn) 
{ 
    try 
    { 
     Socket workerSocket = m_mainSocket.EndAccept (asyn);   
     workerSocket.BeginReceive();      
     // Since the main Socket is now free, it can go back and wait for 
     // other clients who are attempting to connect 
     m_mainSocket.BeginAccept(new AsyncCallback (OnClientConnect),null); 
    } 
    catch(ObjectDisposedException) 
    { 
    } 
    catch(SocketException se) 
    { 
    } 

    }

非常感谢你......这段代码工作得很好。谢谢。 – user1518295 2012-08-03 09:49:19

答

长话短说，TCP/IP协议有连接建立阶段。所以服务器必须调用bind(),listen()和accept()，客户端必须调用connect()。连接建立后，服务器accept()返回一个新客户端服务器套接字。该套接字允许服务器与客户端进行通信（即服务于连接）。

我想向您推荐下面的例子：

Synchronous Server Socket Example。
Synchronous Client Socket Example。

答

试试这个代码

  public void Listen() 
      { 
      string portStr = "5656"; 
      int port = System.Convert.ToInt32(portStr); 
      // Create the listening socket... 
      m_mainSocket = new Socket(AddressFamily.InterNetwork,       SocketType.Stream,ProtocolType.Tcp); 
      IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, port); 
      // Bind to local IP Address... 
      m_mainSocket.Bind(ipLocal); 
      // Start listening... 
      m_mainSocket.Listen(4); 
      btn_start.Enabled = false; 
      lbl_connect.Visible = true; 
      // Create the call back for any client connections... 
      m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null); 
      } 



      public void OnClientConnect(IAsyncResult asyn) 
      { 
      m_workerSocket[m_clientCount] = m_mainSocket.EndAccept(asyn); 
      // Let the worker Socket do the further processing for the 
      // just connected client 
      WaitForData(m_workerSocket[m_clientCount]); 
      // Now increment the client count 
      ++m_clientCount; 
      // Display this client connection as a status message on the GUI  


      // Since the main Socket is now free, it can go back and wait for 
      // other clients who are attempting to connect 
      m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);

// **等待客户数据

  public void WaitForData(System.Net.Sockets.Socket soc) 
      { 
       try 
       { 
        if (pfnWorkerCallBack == null) 
        { 
         // Specify the call back function which is to be 
         // invoked when there is any write activity by the 
         // connected client 
         pfnWorkerCallBack = new AsyncCallback(OnDataReceived); 
        } 
        SocketPacket theSocPkt = new SocketPacket(); 
        theSocPkt.m_currentSocket = soc; 
        // Start receiving any data written by the connected client 
        // asynchronously 
        soc.BeginReceive(theSocPkt.dataBuffer, 0,              theSocPkt.dataBuffer.Length, 
           SocketFlags.None, 
           pfnWorkerCallBack, 
           theSocPkt); 
        } 
        catch (SocketException se) 
        { 
         MessageBox.Show(se.Message); 
        } 

       }

TCP监听套接字错误

相关推荐