Winsock连接失败，错误10049

Question

我有一个c＃gui，当点击一个按钮时调用引用的C++ dll。在C++ DLL我有以下代码

SOCKADDR_IN server; 

    server.sin_port=htons (54321); 
    server.sin_family = AF_INET; 

    server.sin_addr.s_addr = INADDR_ANY; 

    // Connect to server. 
    int iResult = connect(Socket, (SOCKADDR *) & server, sizeof (server)); 
    if (iResult == SOCKET_ERROR) { 

      long iError = WSAGetLastError(); 
      if (iError == WSAEWOULDBLOCK) 
       printf("recv failed with error: WSAEWOULDBLOCK\n"); 
      else 
       printf("recv failed with error: %ld\n", iError); 

     wprintf(L"connect function failed with error: %ld\n", WSAGetLastError()); 
     iResult = closesocket(Socket); 
     if (iResult == SOCKET_ERROR) 
     wprintf(L"closesocket function failed with error: %ld\n", WSAGetLastError()); 
     WSACleanup(); 
     return 1; 
    } 

在C＃调用程序的DLL调用和连接通过Winsock2的在DLL中做之前，我有

再经过

IPAddress localAddr = IPAddress.Parse("127.0.0.1"); 
TcpListener serverSocket = new TcpListener(localAddr,54321); 
int requestCount = 0; 
TcpClient clientSocket = default(TcpClient); 
serverSocket.Start(); 

的dll是叫我做

//调用DLL运行连接代码

clientSocket = serverSocket.AcceptTcpClient();//hangs up here because dll can't Connect. 

在C当我一步++ DLL在连接我得到错误10049，这是 WSAEADDRNOTAVAIL。

msdn winsock error codes

什么我在连接做错了电话？在msdn示例之后，我选择了54321作为端口。 谢谢！

Answer 1

从我所看到的情况来看，除非您没有在此提供代码，否则您没有正确设置SOCKADDR_IN结构的sin_addr字段。它期望以网络字节顺序的IP地址。

你需要做的是这样的：

inet_pton(AF_INET, "127.0.0.1", &server.sin_addr); 

来源：

http://msdn.microsoft.com/en-us/library/windows/desktop/cc805844(v=vs.85).aspx