Qt异步测试http/https网络链接

使用QNetworkRequest（需要在Qt项目中增加Network配置）来进行http/https的网络链接，
使用QFutureWatcher来监听异步测试结果，并在绑定的结果函数中处理用户功能。
不需要在监听结果中处理用户功能，可使用c++异步std::async处理。

#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QtNetwork/QNetworkAccessManager>
#include <QtConcurrent/QtConcurrent>
#include <QtCore/QFutureWatcher>
#include <QtCore/QUrlQuery>
#include <QtCore/QTimer>
#include <QtWidgets/QApplication>
#include <future>
#include <iostream>

QFutureWatcher<bool> futureWatcher;
void DoDeleteLater(QNetworkReply* pReply)
{
    if (Q_NULLPTR == pReply)
    {
        return;
    }

    if (pReply->isRunning())
    {
        pReply->abort();
    }

    pReply->deleteLater();
}

bool TestUrlLinks(const QString& strUrl, int nTimeOutmSec)
{
    QUrl url = QUrl(strUrl);
    if (!url.isValid())
    {
        return false;
    }
    QNetworkRequest request(url);
    request.setRawHeader("Content-Type", "charset='utf-8'");
    request.setRawHeader("Content-Type", "application/json");

    if (0 == strUrl.indexOf("https://", 0, Qt::CaseInsensitive))
    {
        QSslConfiguration conf = request.sslConfiguration();
        conf.setPeerVerifyMode(QSslSocket::VerifyNone);
        conf.setProtocol(QSsl::TlsV1SslV3);
        request.setSslConfiguration(conf);
    }

    auto pNetworkManager = QSharedPointer<QNetworkAccessManager>(new QNetworkAccessManager);
    QEventLoop eventLoop;
    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, &eventLoop, &QEventLoop::quit);
    timer.setSingleShot(true);
    timer.start(nTimeOutmSec);

    auto pReply = QSharedPointer<QNetworkReply>(pNetworkManager->get(request), DoDeleteLater);
    QObject::connect(pReply.data(), &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);
    eventLoop.exec(QEventLoop::ExcludeUserInputEvents);

    if (!timer.isActive())
    {
        return false;
    }

    timer.stop();

    if (QNetworkReply::NoError != pReply->error())
    {
        return false;
    }

    QVariant var = pReply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
    if (!var.isValid())
    {
        return false;
    }

    int nHttpCode = var.toInt();
    return nHttpCode == 200; // 200表示请求成功
}

void HandleWatcherFinished()
{
    if (futureWatcher.result())
    {
        // 链接成功
        qDebug() << "success";
    }
    else
    {
        qDebug() << "fail";
    }
}

void Test(const QString& strUrl, int nTimeOutmSec)
{
    //使用c++异步函数处理测试结果
    //std::async(std::launch::async, [&strUrl]() { 
    //bool bRet = TestUrlLinks(strUrl, 3000); 
    //std::cout << (bRet ? "success" : "fail") << std::endl;});

    //使用QFutureWatcher监听测试结果
    QObject::connect(&futureWatcher, &QFutureWatcher<bool>::finished, &HandleWatcherFinished);
    QFuture<bool> future = QtConcurrent::run<bool>(&TestUrlLinks, strUrl, nTimeOutmSec);
    futureWatcher.setFuture(future);
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Test("http://www.baidu.com", 3000);
    return a.exec();
}

https连接测试失败处理

Qt5.12以前的版本：下载libeay32.dll 和 ssleay32.dll两个库文件，将这两个库文件拷贝到程序生成目录下
Qt5.12.5以后的版本: 下载libssl-1_1.dll 和 libcrypto-1_1.dll两个库文件，将这两个库文件拷贝到程序生成目录下