QT 下使用winhttp库 使用https SSL post数据 例子

以下是使用winhttp库在QT下使用https SSL post数据的示例代码：

#include <Windows.h>
#include <Winhttp.h>

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

void postData()
{
    HINTERNET hSession = NULL;
    HINTERNET hConnect = NULL;
    HINTERNET hRequest = NULL;
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer;
    BOOL bResults = FALSE;

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

    // Specify an HTTPS server
    hConnect = WinHttpConnect(hSession, L"www.example.com", INTERNET_DEFAULT_HTTPS_PORT, 0);
    if (!hConnect)
    {
        qDebug() << "WinHttpConnect failed!" << GetLastError();
        goto cleanup;
    }

    // Create an HTTPS request
    hRequest = WinHttpOpenRequest(hConnect, L"POST", L"/post", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
    if (!hRequest)
    {
        qDebug() << "WinHttpOpenRequest failed!" << GetLastError();
        goto cleanup;
    }

    // Set request headers
    LPCWSTR pszHeaders = L"Content-Type: application/x-www-form-urlencoded\r\n";
    bResults = WinHttpAddRequestHeaders(hRequest, pszHeaders, (DWORD)-1L, WINHTTP_ADDREQ_FLAG_ADD);
    if (!bResults)
    {
        qDebug() << "WinHttpAddRequestHeaders failed!" << GetLastError();
        goto cleanup;
    }

    // Send the POST request
    LPCWSTR pszData = L"key1=value1&key2=value2";
    bResults = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, (LPVOID)pszData, wcslen(pszData), wcslen(pszData), 0);
    if (!bResults)
    {
        qDebug() << "WinHttpSendRequest failed!" << GetLastError();
        goto cleanup;
    }

    // Receive response from the server
    bResults = WinHttpReceiveResponse(hRequest, NULL);
    if (!bResults)
    {
        qDebug() << "WinHttpReceiveResponse failed!" << GetLastError();
        goto cleanup;
    }

    // Read the server's response
    do
    {
        // Check for available data
        dwSize = 0;
        if (!WinHttpQueryDataAvailable(hRequest, &dwSize))
        {
            qDebug() << "WinHttpQueryDataAvailable failed!" << GetLastError();
            goto cleanup;
        }

        // Allocate space for the buffer
        pszOutBuffer = new char[dwSize + 1];
        if (!pszOutBuffer)
        {
            qDebug() << "Out of memory!";
            goto cleanup;
        }

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

        // Print the response to the console
        qDebug() << QString::fromLocal8Bit(pszOutBuffer);

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

    } while (dwSize > 0);

cleanup:
    // Close any open handles
    if (hRequest) WinHttpCloseHandle(hRequest);
    if (hConnect) WinHttpCloseHandle(hConnect);
    if (hSession) WinHttpCloseHandle(hSession);
}

以上代码中，我们首先使用WinHttpOpen函数创建一个WinHTTP会话，然后使用WinHttpConnect函数连接到指定的HTTPS服务器。接着，我们使用WinHttpOpenRequest函数创建一个HTTPS请求，并使用WinHttpAddRequestHeaders函数设置请求头。然后，我们使用WinHttpSendRequest函数发送POST请求，并使用WinHttpReceiveResponse函数接收服务器的响应。最后，我们使用WinHttpQueryDataAvailable函数查询是否有可用的数据，使用WinHttpReadData函数读取服务器的响应，并使用qDebug打印到控制台上。注意，我们使用了QString::fromLocal8Bit函数将服务器的响应从char *转换为QString。最后，我们使用WinHttpCloseHandle函数关闭所有打开的句柄。