QT通过url下载图片到本地

/*
strUrl:下载图片时需要的url
strFilePath:下载图片的位置（/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)
{
    //循环拼接
    QString baseUrl =url;
    //构造请求
    QNetworkRequest request;
    request.setUrl(QUrl(baseUrl));
    QNetworkAccessManager *manager = new QNetworkAccessManager();
    // 发送请求
    QNetworkReply *pReplay = manager->get(request);
    //开启一个局部的事件循环，等待响应结束，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();
    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服务器的相应码，reply->error()是Qt定义的错误码，可以参考QT的文档
        qWarning()<<QString("request %1 found error ....code: %2 %3").arg(obj).arg(statusCodeV.toInt()).arg((int)pReplay->error());
        qWarning(qPrintable(pReplay->errorString()));
    }
    //获取响应信息
    QByteArray bytes = pReplay->readAll();
    return bytes;
}