Winsock連接失敗，錯誤10049

Question

我有一個c＃gui，當點擊一個按鈕時調用引用的C++ dll。在C++ DLL我有以下代碼

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＃調用程序的DLL調用和連接通過Winsock2的在DLL中做之前，我有

再經過

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

//調用DLL運行連接代碼

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

在C當我一步++ DLL在連接我得到錯誤10049，這是 WSAEADDRNOTAVAIL。

msdn winsock error codes

什麼我在連接做錯了電話？在msdn示例之後，我選擇了54321作爲端口。 謝謝！

Answer 1

從我所看到的情況來看，除非您沒有在此提供代碼，否則您沒有正確設置SOCKADDR_IN結構的sin_addr字段。它期望以網絡字節順序的IP地址。

你需要做的是這樣的：

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

來源：

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