获取套接字功能的连接超时。

我对网络很陌生,我正在尝试打开套接字并从服务器获取文件。 我收到连接超时错误100060。 我的代码是:-
#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>


// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, \"Ws2_32.lib\")
#pragma comment (lib, \"Mswsock.lib\")
#pragma comment (lib, \"AdvApi32.lib\")


#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT \"27015\"

int __cdecl main(int argc, char **argv) 
{
    WSADATA wsaData;
    SOCKET ConnectSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL,
                    *ptr = NULL,
                    hints;
    char *sendbuf = \"this is a test\";
    char recvbuf[DEFAULT_BUFLEN];
    int iResult;
    int recvbuflen = DEFAULT_BUFLEN;

    // Validate the parameters
    if (argc != 1) {
        printf(\"usage: %s server-name\\n\", argv[0]);
        return 1;
    }

    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf(\"WSAStartup failed with error: %d\\n\", iResult);
        return 1;
    }

    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(\"74.125.236.83\", DEFAULT_PORT, &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);
        printf(\"inside loop\\n\");
        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);
        printf(\"%d\\n\",ptr->ai_addrlen);
        if (iResult == SOCKET_ERROR) {
            printf(\"socket error\\n\");
            printf(\"shutdown failed with error: %d\\n\", WSAGetLastError());
            closesocket(ConnectSocket);
            ConnectSocket = INVALID_SOCKET;
            continue;
        }
        break;
    }

    freeaddrinfo(result);

    if (ConnectSocket == INVALID_SOCKET) {
        printf(\"Unable to connect to server!\\n\");
        WSACleanup();
        return 1;
    }

    // Send an initial buffer
    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf(\"send failed with error: %d\\n\", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    printf(\"Bytes Sent: %ld\\n\", iResult);

    // shutdown the connection since no more data will be sent
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf(\"shutdown failed with error: %d\\n\", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    // Receive until the peer closes the connection
    do {

        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 )
            printf(\"Bytes received: %d\\n\", iResult);
        else if ( iResult == 0 )
            printf(\"Connection closed\\n\");
        else
            printf(\"recv failed with error: %d\\n\", WSAGetLastError());

    } while( iResult > 0 );

    // cleanup
    closesocket(ConnectSocket);
    WSACleanup();

    return 0;
}
    
已邀请:
        您是否尝试过使用AF_INET而不是AF_UNSPEC? 也许您应该对结果中的值进行printf(),尤其是ptr-> ai_addr,以确保分辨率正常。 并且显然检查服务器是否在另一端正在监听和接受。您是否证明了这一点,例如:
telnet 74.125.236.83:27015
    
        在这一行:
 // Attempt to connect to an address until one succeeds
for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {
您正在将
ptr
初始化为
result
。但是ѭ4never永远不会设置为值!= NULL,因此循环立即退出。 从您的代码中,在我看来您的意思是:
 // Attempt to connect to an address until one succeeds
for(ptr=hints; ptr != NULL ;ptr=ptr->ai_next) {
    

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