Question

我刚刚开始学习WinSock。我开始阅读这篇文章： https://msdn.microsoft.com/en-us/library/windows/desktop/bb530750(v=vs.85).aspx 我做了我写的事情。

但我无法连接，每次运行此程序时我都会遇到同样的错误：

连接超时。连接尝试失败，因为连接方在一段时间后未正确响应，或者由于连接的主机未能响应而建立的连接失败。

你告诉我，我错了什么？如何修复我的代码？

PS。 IP地址是google.pl

PS2。负责连接的实际代码：

iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
while (iResult == SOCKET_ERROR){
    cout << "Blad ustanowienia polaczenia:\t" << WSAGetLastError() << endl;
    ptr = ptr->ai_next;
    iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);

}

Answer 1

在致电getaddrinfo()之前，您应致电connect()解析地址：

    SOCKET ConnectSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL,
                    *ptr = NULL,
                    hints;

    ZeroMemory( &hints, sizeof(hints) );
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    // Resolve the server address and port
    iResult = getaddrinfo(addr, nPort, &hints, &result);
    if ( iResult != 0 ) 
    {
        printf("getaddrinfo failed with error: %d\n", iResult);
        WSACleanup();
        return 1;
    }

    // Attempt to connect to an address until one succeeds
    for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) 
    {

        // Create a SOCKET for connecting to server
        ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, 
            ptr->ai_protocol);
        if (ConnectSocket == INVALID_SOCKET) 
        {
            printf("socket failed with error: %ld\n", WSAGetLastError());
            WSACleanup();
            return 1;
        }

        // Connect to server.
        iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
        if (iResult == SOCKET_ERROR) 
        {
            closesocket(ConnectSocket);
            ConnectSocket = INVALID_SOCKET;
            continue;
        }
        break;
    }

    freeaddrinfo(result);

Answer 2

我已将地址更改为＆＃34; google.com＆＃34;和＃34; 80＆＃34;它的工作原理。非常感谢！

WinSock无法连接

2 个答案: