在 C++ 中，使用 WinHTTP 庫處理 HTTP 響應頭的方法如下：

1. 首先，確保已經包含了必要的頭文件并鏈接到了 winhttp.lib 庫。

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

2. 使用 WinHttpOpen()、WinHttpConnect() 和 WinHttpOpenRequest() 函數初始化 HTTP 請求。

3. 使用 WinHttpSendRequest() 函數發送 HTTP 請求。

4. 使用 WinHttpReceiveResponse() 函數接收 HTTP 響應。

5. 使用 WinHttpQueryHeaders() 函數查詢和處理響應頭。

以下是一個完整的示例代碼：

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

int main() {
    // 初始化 HTTP 會話
    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;
    }

    // 連接到服務器
    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;
    }

    // 打開 HTTP 請求
    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;
    }

    // 發送 HTTP 請求
    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 響應
    bResult = WinHttpReceiveResponse(hRequest, NULL);
    if (!bResult) {
        std::cerr << "Error receiving response."<< std::endl;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return -1;
    }

    // 查詢和處理響應頭
    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;

    // 關閉句柄
    WinHttpCloseHandle(hRequest);
    WinHttpCloseHandle(hConnect);
    WinHttpCloseHandle(hSession);

    return 0;
}

這個示例代碼將連接到 example.com 服務器，發送一個 GET 請求，然后輸出響應頭。注意，你需要根據實際情況修改服務器地址和請求路徑。