写个WinHttp 访问https://www.amazon.com.au/ap/signin 并返回响应内容

下面是使用 WinHttp 访问 https://www.amazon.com.au/ap/signin 并返回响应内容的示例代码：

#include <windows.h>
#include <winhttp.h>
#include <iostream>
#include <string>

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

int main()
{
    HINTERNET hSession = NULL, hConnect = NULL, hRequest = NULL;

    // 初始化 WinHttp
    hSession = WinHttpOpen(L"WinHTTP Example/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
    if (!hSession)
    {
        std::cout << "Failed to open WinHttp session." << std::endl;
        return 1;
    }

    // 建立连接
    hConnect = WinHttpConnect(hSession, L"www.amazon.com.au", INTERNET_DEFAULT_HTTPS_PORT, 0);
    if (!hConnect)
    {
        std::cout << "Failed to connect to server." << std::endl;
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 创建请求
    hRequest = WinHttpOpenRequest(hConnect, L"GET", L"/ap/signin", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
    if (!hRequest)
    {
        std::cout << "Failed to create request." << std::endl;
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 发送请求
    if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0))
    {
        std::cout << "Failed to send request." << std::endl;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 等待响应
    if (!WinHttpReceiveResponse(hRequest, NULL))
    {
        std::cout << "Failed to receive response." << std::endl;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 读取响应内容
    std::string response;
    DWORD dwSize = 0, dwDownloaded = 0;
    LPSTR pszOutBuffer = NULL;

    do
    {
        // 确定缓冲区大小
        dwSize += 4096;
        pszOutBuffer = (LPSTR)realloc(pszOutBuffer, dwSize);
        if (!pszOutBuffer)
        {
            std::cout << "Out of memory." << std::endl;
            WinHttpCloseHandle(hRequest);
            WinHttpCloseHandle(hConnect);
            WinHttpCloseHandle(hSession);
            return 1;
        }

        // 读取响应内容
        ZeroMemory(pszOutBuffer + dwDownloaded, 4096);
        if (!WinHttpReadData(hRequest, pszOutBuffer + dwDownloaded, 4096, &dwDownloaded))
        {
            std::cout << "Failed to read data." << std::endl;
            WinHttpCloseHandle(hRequest);
            WinHttpCloseHandle(hConnect);
            WinHttpCloseHandle(hSession);
            return 1;
        }

        // 将读取到的内容添加到字符串中
        response.append(pszOutBuffer + dwDownloaded, dwDownloaded);
    } while (dwDownloaded > 0);

    // 输出响应内容
    std::cout << response << std::endl;

    // 释放资源
    free(pszOutBuffer);
    WinHttpCloseHandle(hRequest);
    WinHttpCloseHandle(hConnect);
    WinHttpCloseHandle(hSession);

    return 0;
}

这段代码与前面的代码类似，不同之处在于它将响应内容保存到一个 std::string 类型的变量中，并在读取响应内容时将每次读取到的内容添加到字符串中。最后输出字符串即可。