HttpQueryInfo HTTP_QUERY_SET_COOKIE | HTTP_QUERY_FLAG_REQUEST_HEADERS 实例

HttpQueryInfo 函数可以用来获取 HTTP 请求的信息，其中 HTTP_QUERY_SET_COOKIE 和 HTTP_QUERY_FLAG_REQUEST_HEADERS 分别用来获取设置的 cookie 和请求头信息。

以下是一个示例代码，演示如何使用 HttpQueryInfo 获取请求头和设置 cookie：

#include <Windows.h>
#include <WinInet.h>
#include <iostream>

#pragma comment (lib, "wininet.lib")

int main()
{
    HINTERNET hInternet = InternetOpen(L"HttpQueryInfo Example", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (hInternet == NULL)
    {
        std::cout << "Failed to open internet handle: " << GetLastError() << std::endl;
        return 1;
    }

    HINTERNET hConnect = InternetConnect(hInternet, L"www.example.com", INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
    if (hConnect == NULL)
    {
        std::cout << "Failed to open internet connection: " << GetLastError() << std::endl;
        InternetCloseHandle(hInternet);
        return 1;
    }

    HINTERNET hRequest = HttpOpenRequest(hConnect, L"GET", L"/", NULL, NULL, NULL, 0, 0);
    if (hRequest == NULL)
    {
        std::cout << "Failed to open http request: " << GetLastError() << std::endl;
        InternetCloseHandle(hConnect);
        InternetCloseHandle(hInternet);
        return 1;
    }

    BOOL bSend = HttpSendRequest(hRequest, NULL, 0, NULL, 0);
    if (!bSend)
    {
        std::cout << "Failed to send http request: " << GetLastError() << std::endl;
        InternetCloseHandle(hRequest);
        InternetCloseHandle(hConnect);
        InternetCloseHandle(hInternet);
        return 1;
    }

    // 获取请求头信息
    DWORD dwSize = 0;
    HttpQueryInfo(hRequest, HTTP_QUERY_FLAG_REQUEST_HEADERS, NULL, &dwSize, NULL);
    std::wstring strHeaders(dwSize / sizeof(wchar_t), L'\0');
    HttpQueryInfo(hRequest, HTTP_QUERY_FLAG_REQUEST_HEADERS, &strHeaders[0], &dwSize, NULL);

    std::wcout << L"Request Headers: " << std::endl << strHeaders << std::endl;

    // 获取设置的 cookie
    dwSize = 0;
    HttpQueryInfo(hRequest, HTTP_QUERY_SET_COOKIE, NULL, &dwSize, NULL);
    std::wstring strCookie(dwSize / sizeof(wchar_t), L'\0');
    HttpQueryInfo(hRequest, HTTP_QUERY_SET_COOKIE, &strCookie[0], &dwSize, NULL);

    std::wcout << L"Set-Cookie: " << std::endl << strCookie << std::endl;

    InternetCloseHandle(hRequest);
    InternetCloseHandle(hConnect);
    InternetCloseHandle(hInternet);

    return 0;
}

在这个示例中，我们使用 HttpQueryInfo 获取了请求头和设置的 cookie，并打印在控制台上。注意，这个示例中只是演示如何使用 HttpQueryInfo 函数，实际的应用中，我们可能会根据自己的需求，选择不同的信息来获取。