qt5.6使用winhttp库post https方法

如果您想直接使用WinHttp库发送HTTP POST请求，可以使用以下代码：

#include <QtCore/QCoreApplication>
#include <Windows.h>
#include <Winhttp.h>
#include <QDebug>

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

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    HINTERNET 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();
        return 1;
    }

    HINTERNET hConnect = WinHttpConnect(hSession, L"example.com", INTERNET_DEFAULT_HTTPS_PORT, 0);
    if(!hConnect) {
        qDebug() << "WinHttpConnect failed:" << GetLastError();
        WinHttpCloseHandle(hSession);
        return 1;
    }

    HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"POST", L"/", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
    if(!hRequest) {
        qDebug() << "WinHttpOpenRequest failed:" << GetLastError();
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    LPCWSTR headers = L"Content-Type: application/x-www-form-urlencoded\r\n";
    LPCWSTR data = L"key1=value1&key2=value2";
    DWORD dataLength = wcslen(data) * sizeof(WCHAR);

    BOOL bResult = WinHttpSendRequest(hRequest, headers, wcslen(headers), (LPVOID)data, dataLength, dataLength, 0);
    if(!bResult) {
        qDebug() << "WinHttpSendRequest failed:" << GetLastError();
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    bResult = WinHttpReceiveResponse(hRequest, NULL);
    if(!bResult) {
        qDebug() << "WinHttpReceiveResponse failed:" << GetLastError();
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    DWORD statusCode = 0;
    DWORD statusCodeSize = sizeof(DWORD);
    bResult = WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER, NULL, &statusCode, &statusCodeSize, NULL);
    if(!bResult) {
        qDebug() << "WinHttpQueryHeaders failed:" << GetLastError();
    } else {
        qDebug() << "Status code:" << statusCode;
    }

    QByteArray responseData;
    DWORD bytesRead = 0;
    DWORD bufferSize = 4096;
    LPBYTE buffer = new BYTE[bufferSize];