QT通過url下載圖片到本地

/*
strUrl:下載圖片時需要的url
strFilePath:下載圖片的位置（/home/XXX/YYY.png）
*/
void ThorPromote::downloadFileFromUrl(QString strUrl, QString strFilePath)
{
    qDebug() << strUrl << "    " << strFilePath;
    QFile file;
    file.setFileName(strFilePath);
    if(file.open(QIODevice::WriteOnly))
    {
        QByteArray byte = webhelper::InitGetRequest(strUrl, "downImgFromUrl");
        file.write(byte);
        file.close();
    }
}


//get
QByteArray webhelper::InitGetRequest(QString url, QString obj)
{
    //循環拼接
    QString baseUrl =url;
    //構造請求
    QNetworkRequest request;
    request.setUrl(QUrl(baseUrl));
    QNetworkAccessManager *manager = new QNetworkAccessManager();
    // 發送請求
    QNetworkReply *pReplay = manager->get(request);
    //開啟一個局部的事件循環，等待響應結束，退出
    QEventLoop eventLoop;
    QObject::connect(pReplay,SIGNAL(finished()), &eventLoop, SLOT(quit()));

    //add timeout deal
    QTimer *tmpTimer = new QTimer();
    connect(tmpTimer,SIGNAL(timeout()),&eventLoop, SLOT(quit()));
    tmpTimer->setSingleShot(true);
    tmpTimer->start(5000);
    eventLoop.exec();
    tmpTimer->stop();

    if (pReplay->error() == QNetworkReply::NoError)
    {
        qInfo() << QString("request %1 NoError").arg(obj);
    }
    else
    {
        qWarning()<<QString("request %1 handle errors here").arg(obj);
        QVariant statusCodeV = pReplay->attribute(QNetworkRequest::HttpStatusCodeAttribute);
        //statusCodeV是HTTP服務器的相應碼，reply->error()是Qt定義的錯誤碼，可以參考QT的文檔
        qWarning()<<QString("request %1 found error ....code: %2 %3").arg(obj).arg(statusCodeV.toInt()).arg((int)pReplay->error());
        qWarning(qPrintable(pReplay->errorString()));
    }
    //獲取響應信息
    QByteArray bytes = pReplay->readAll();
    return bytes;
}