用Winhttp写一个POST https://sellercentral.amazon.com.au/ap/signin 的自定义函数，参数有请求头和请求数据，return响应头和响应内容

好的，我可以帮你编写一个Winhttp的POST请求函数。以下是示例代码：

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

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

std::string postRequest(std::string url, std::string headers, std::string postData)
{
    HINTERNET hSession = NULL, hConnect = NULL, hRequest = NULL;
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer = NULL;
    std::string response;

    // Initialize WinHTTP.
    hSession = WinHttpOpen(L"WinHTTP Example/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
    if (!hSession)
    {
        goto cleanup;
    }

    // Specify an HTTP server.
    hConnect = WinHttpConnect(hSession, L"sellercentral.amazon.com.au", INTERNET_DEFAULT_HTTPS_PORT, 0);
    if (!hConnect)
    {
        goto cleanup;
    }

    // Create an HTTP request handle.
    hRequest = WinHttpOpenRequest(hConnect, L"POST", L"/ap/signin", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
    if (!hRequest)
    {
        goto cleanup;
    }

    // Add request headers.
    if (!WinHttpAddRequestHeaders(hRequest, headers.c_str(), headers.length(), WINHTTP_ADDREQ_FLAG_ADD))
    {
        goto cleanup;
    }

    // Send a request.
    if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, (LPVOID)postData.c_str(), postData.length(), postData.length(), 0))
    {
        goto cleanup;
    }

    // End the request.
    if (!WinHttpReceiveResponse(hRequest, NULL))
    {
        goto cleanup;
    }

    // Query headers size.
    if (!WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, NULL, &dwSize, WINHTTP_NO_HEADER_INDEX))
    {
        goto cleanup;
    }
    else
    {
        // Allocate memory for the buffer.
        pszOutBuffer = new char[dwSize];
        if (!pszOutBuffer)
        {
            goto cleanup;
        }

        // Read the headers.
        if (!WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, WINHTTP_HEADER_NAME_BY_INDEX, pszOutBuffer, &dwSize, WINHTTP_NO_HEADER_INDEX))
        {
            goto cleanup;
        }
        else
        {
            response.append(pszOutBuffer);
            response.append("\r\n");
        }
    }

    // Read the response.
    do
    {
        dwSize = 0;
        if (!WinHttpQueryDataAvailable(hRequest, &dwSize))
        {
            goto cleanup;
        }

        if (dwSize == 0)
        {
            break;
        }

        // Allocate space for the buffer.
        pszOutBuffer = new char[dwSize + 1];
        if (!pszOutBuffer)
        {
            goto cleanup;
        }

        // Read the data.
        ZeroMemory(pszOutBuffer, dwSize + 1);
        if (!WinHttpReadData(hRequest, (LPVOID)pszOutBuffer, dwSize, &dwDownloaded))
        {
            goto cleanup;
        }

        // Append the response to the buffer.
        response.append(pszOutBuffer);

        // Free the memory allocated to the buffer.
        delete[] pszOutBuffer;

    } while (dwSize > 0);

cleanup:
    // Clean up the resources.
    if (hRequest) WinHttpCloseHandle(hRequest);
    if (hConnect) WinHttpCloseHandle(hConnect);
    if (hSession) WinHttpCloseHandle(hSession);
    if (pszOutBuffer) delete[] pszOutBuffer;

    return response;
}

这个函数接受三个参数：

- `url`：请求的URL地址，这里是`https://sellercentral.amazon.com.au/ap/signin`。
- `headers`：请求头，可以自行构造需要的请求头。
- `postData`：请求数据，可以自行构造需要POST的数据。

函数返回的是一个字符串，其中包含了响应头和响应内容。你可以使用这个函数来向指定URL发送POST请求，并获取响应。