用Winhttp写一个POST https://sellercentral.amazon.com.au/ap/signin 的函数 并且返回响应头和响应内容

好的，以下是使用Winhttp写一个POST请求的函数，并返回响应头和响应内容的代码示例：

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

int main()
{
    // 初始化WinHttp
    HINTERNET hSession = WinHttpOpen(L"WinHTTP Example/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);

    if (!hSession)
    {
        printf("WinHttpOpen failed, error %u\n", GetLastError());
        return 1;
    }

    // 创建连接
    HINTERNET hConnect = WinHttpConnect(hSession, L"sellercentral.amazon.com.au", INTERNET_DEFAULT_HTTPS_PORT, 0);

    if (!hConnect)
    {
        printf("WinHttpConnect failed, error %u\n", GetLastError());
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 创建请求
    HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"POST", L"/ap/signin", NULL, WINHTTP_NO_REFERER, NULL, WINHTTP_FLAG_SECURE);

    if (!hRequest)
    {
        printf("WinHttpOpenRequest failed, error %u\n", GetLastError());
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 设置请求头
    LPCWSTR szHeaders = L"Content-Type: application/x-www-form-urlencoded\r\n";
    if (!WinHttpAddRequestHeaders(hRequest, szHeaders, (ULONG)-1L, WINHTTP_ADDREQ_FLAG_REPLACE | WINHTTP_ADDREQ_FLAG_ADD))
    {
        printf("WinHttpAddRequestHeaders failed, error %u\n", GetLastError());
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 设置请求数据
    LPCWSTR szData = L"username=myusername&password=mypassword";
    if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, (LPVOID)szData, (DWORD)wcslen(szData) * 2, (DWORD)wcslen(szData) * 2, 0))
    {
        printf("WinHttpSendRequest failed, error %u\n", GetLastError());
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 发送请求
    if (!WinHttpReceiveResponse(hRequest, NULL))
    {
        printf("WinHttpReceiveResponse failed, error %u\n", GetLastError());
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 获取响应头
    DWORD dwSize = 0;
    if (!WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, NULL, &dwSize, WINHTTP_NO_HEADER_INDEX))
    {
        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        {
            printf("WinHttpQueryHeaders failed, error %u\n", GetLastError());
            WinHttpCloseHandle(hRequest);
            WinHttpCloseHandle(hConnect);
            WinHttpCloseHandle(hSession);
            return 1;
        }
    }

    LPWSTR szHeadersBuffer = new WCHAR[dwSize / 2];
    if (!WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, szHeadersBuffer, &dwSize, WINHTTP_NO_HEADER_INDEX))
    {
        printf("WinHttpQueryHeaders failed, error %u\n", GetLastError());
        delete[] szHeadersBuffer;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 获取响应内容
    DWORD dwContentLength = 0;
    if (!WinHttpQueryDataAvailable(hRequest, &dwContentLength))
    {
        printf("WinHttpQueryDataAvailable failed, error %u\n", GetLastError());
        delete[] szHeadersBuffer;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    LPWSTR szContentBuffer = new WCHAR[dwContentLength / 2 + 1];
    ZeroMemory(szContentBuffer, dwContentLength / 2 + 1);

    if (!WinHttpReadData(hRequest, szContentBuffer, dwContentLength, NULL))
    {
        printf("WinHttpReadData failed, error %u\n", GetLastError());
        delete[] szHeadersBuffer;
        delete[] szContentBuffer;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 打印响应头和响应内容
    wprintf(L"Headers:\n%s\n\n", szHeadersBuffer);
    wprintf(L"Content:\n%s\n", szContentBuffer);

    // 释放资源
    delete[] szHeadersBuffer;
    delete[] szContentBuffer;
    WinHttpCloseHandle(hRequest);
    WinHttpCloseHandle(hConnect);
    WinHttpCloseHandle(hSession);
    return 0;
}

需要注意的是，请求数据需要按照要求进行编码，这里使用的是`application/x-www-form-urlencoded`编码方式，可以根据实际情况进行修改。另外，代码中的用户名和密码需要根据实际情况进行修改。