QT 큰 파일 다운로드할 때 화면 멈춤 현상

QT에서 큰 파일을 다운로드할 때 화면이 멈추는 현상이 발생했습니다.

 

이를 개선하기 위한 작업으로..

QNetworkAccessManager* mgr = new QNetworkAccessManager();
QNetworkReply* rpy = mgr->get(request);
 
QObject::connect(mgr, SIGNAL(finished(QNetworkReply*)), this, SLOT(downloadFinished(QNetworkReply*)));
QObject::connect(rpy, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(downloadProgress(qint64, qint64)));
QObject::connect(rpy, SIGNAL(QNetworkReply::errorOccurred(QNetworkReply::NetworkError*)), this, SLOT(downloadError(QNetworkReply::NetworkError)));

 

다운로드 완료시점(finished)에

void UpdateManager::downloadFinished(QNetworkReply* data)
{
    try
    {
        qDebug() << "downloadFinished!!";
 
        QString updatePath = QString("%1/update").arg(qApp->applicationDirPath());
        if (QDir(updatePath).exists() != true)
        {
            MakeFolder(updatePath.toStdWString().c_str());
        }
 
        _threadDownload = std::thread(&UpdateManager::downloadThread, this, data);
        _threadDownload.detach();
    }
    catch (std::exception& e)
    {
    }
}

 

 

 

스레드를 만들어서 실행하면 멈춤현상이 없어진다.

void UpdateManager::downloadThread(QNetworkReply* data)
{
    QString updatePath = QString("%1/update").arg(qApp->applicationDirPath());
    QFile localFile(updatePath + "/RAYFace_v" + _newVersion + "_setup.exe");
    if (!localFile.open(QIODevice::WriteOnly))
        return;
 
    QByteArray ba = data->readAll();
    localFile.write(ba);
    localFile.close();
 
    emit signalDownloadFinished(_newVersion);
}