UDP服务器，数据报套接字，ReceiveFrom（）引发WSAENOTCONN异常; SendTo（）工作正常。 [英] UDP Server, Datagram Socket, ReceiveFrom() raises WSAENOTCONN exception; SendTo() works fine.

问题描述

我正在运行一个简单的应用程序，试图设置与远程UDP客户端通信的UDP服务器。  一切正常 - 在客户端发送，接收和SendTo，但是，ReceiveFrom导致SocketException错误代码  WSAENOTCONN 。

I'm running a simple app that attempts to setup a UDP Server communicating with a remote UDP Client.  Everything works - send, receive on the client side and SendTo on this side,  but ReceiveFrom causes a SocketException with error code WSAENOTCONN.

这是可疑的udp服务器代码：

Here is the suspect udp server code :

  ---  

 ---   

          localEndPoint = gcnew IPEndPoint（IPAddress :: Any，port）;

          socket = gcnew Socket（localEndPoint-> AddressFamily，

                  SocketType :: Dgram，

                  ProtocolType :: Udp）;



  &NBSP; &NBSP; &NBSP;   socket-> Bind（safe_cast< EndPoint ^>（localEndPoint））;

  &NBSP; &NBSP; &NBSP;   socket-> ReceiveTimeout = rcvTimeout;

  &NBSP; &NBSP; &NBSP;   socket-> SendTimeout    = sndTimeout;



  &NBSP; &NBSP; &NBSP;   remoteEndPoint = gcnew IPEndPoint（IPAddress :: Any，0）;

  &NBSP; &NBSP; &NBSP;   endPoint  &NBSP; &NBSP; = safe_cast< EndPoint ^>（remoteEndPoint）;

         localEndPoint = gcnew IPEndPoint(IPAddress::Any, port);
         socket = gcnew Socket(localEndPoint->AddressFamily,
                               SocketType::Dgram,
                               ProtocolType::Udp);

         socket->Bind(safe_cast<EndPoint^>(localEndPoint));
         socket->ReceiveTimeout = rcvTimeout;
         socket->SendTimeout    = sndTimeout;

         remoteEndPoint = gcnew IPEndPoint(IPAddress::Any, 0);
         endPoint       = safe_cast<EndPoint^>(remoteEndPoint);

...

    array< Byte> ^ data = Text :: Encoding :: ASCII-> GetBytes（msg）;

    socket-> SendTo（data，data-> Length，SocketFlags :: None，endPoint）;

   array<Byte>^data = Text::Encoding::ASCII->GetBytes(msg);
   socket->SendTo(data, data->Length, SocketFlags::None, endPoint);

...

   &NBSP; &NBSP; Int32字节;

  &NBSP; &NBSP; array< Byte> ^ data = gcnew array< Byte>（256）;

  &NBSP; &NBSP; bytes  = socket-> ReceiveFrom（data，SocketFlags :: None，endPoint）;

---

      bytes  = socket->ReceiveFrom(data, SocketFlags::None, endPoint);
---

有人能告诉我怎么了 ？ &NBSP;非常感谢。

Could someone tell me what is wrong ?   Much appreciated.

推荐答案

您好iGUB14，

Hi iGUB14,

欢迎来到MSDN论坛。

Welcome to MSDN forum.

此论坛正在讨论Visual Studio WPF / SL Designer，Visual Studio Guidance Automation Toolkit，开发人员文档和帮助系统，以及Visual Studio编辑器。 

您的问题与C ++开发有关，我将移动此线程到
Visual Studio Languages
 ，  Windows桌面开发
&NBSP;>&NBSP;
Visual C ++ 专业答案。

Your issue is related to C++ develop, I will move this thread to Visual Studio Languages  , Windows Desktop Development  >  Visual C++ for a professional answer.

祝你好运，

乔伊斯

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