C++ WinHttp如何处理响应头

在 C++ 中，使用 WinHTTP 库处理 HTTP 响应头的方法如下：

首先，确保已经包含了必要的头文件并链接到了 winhttp.lib 库。

#include<iostream>#include<windows.h>#include <winhttp.h>#pragma comment(lib, "winhttp.lib")

使用 WinHttpOpen()、WinHttpConnect() 和 WinHttpOpenRequest() 函数初始化 HTTP 请求。

使用 WinHttpSendRequest() 函数发送 HTTP 请求。

使用 WinHttpReceiveResponse() 函数接收 HTTP 响应。

使用 WinHttpQueryHeaders() 函数查询和处理响应头。

以下是一个完整的示例代码：

#include<iostream>#include<windows.h>#include <winhttp.h>#pragma comment(lib, "winhttp.lib")int main() {    // 初始化 HTTP 会话    HINTERNET hSession = WinHttpOpen(L"MyUserAgent", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);    if (!hSession) {        std::cerr << "Error opening HTTP session."<< std::endl;        return -1;    }    // 连接到服务器    HINTERNET hConnect = WinHttpConnect(hSession, L"example.com", INTERNET_DEFAULT_HTTPS_PORT, 0);    if (!hConnect) {        std::cerr << "Error connecting to server."<< std::endl;        WinHttpCloseHandle(hSession);        return -1;    }    // 打开 HTTP 请求    HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", L"/path", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);    if (!hRequest) {        std::cerr << "Error opening request."<< std::endl;        WinHttpCloseHandle(hConnect);        WinHttpCloseHandle(hSession);        return -1;    }    // 发送 HTTP 请求    BOOL bResult = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0);    if (!bResult) {        std::cerr << "Error sending request."<< std::endl;        WinHttpCloseHandle(hRequest);        WinHttpCloseHandle(hConnect);        WinHttpCloseHandle(hSession);        return -1;    }    // 接收 HTTP 响应    bResult = WinHttpReceiveResponse(hRequest, NULL);    if (!bResult) {        std::cerr << "Error receiving response."<< std::endl;        WinHttpCloseHandle(hRequest);        WinHttpCloseHandle(hConnect);        WinHttpCloseHandle(hSession);        return -1;    }    // 查询和处理响应头    DWORD dwSize = 0;    WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, NULL, &dwSize, WINHTTP_NO_HEADER_INDEX);    std::wstring headers(dwSize / sizeof(wchar_t), L'\0');    bResult = WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, &headers[0], &dwSize, WINHTTP_NO_HEADER_INDEX);    if (!bResult) {        std::cerr << "Error querying headers."<< std::endl;        WinHttpCloseHandle(hRequest);        WinHttpCloseHandle(hConnect);        WinHttpCloseHandle(hSession);        return -1;    }    std::wcout << L"Response headers:"<< std::endl<< headers<< std::endl;    // 关闭句柄    WinHttpCloseHandle(hRequest);    WinHttpCloseHandle(hConnect);    WinHttpCloseHandle(hSession);    return 0;}

这个示例代码将连接到 example.com 服务器，发送一个 GET 请求，然后输出响应头。注意，你需要根据实际情况修改服务器地址和请求路径。