explicit mynetworkmanager(int filetype,QString url,QString data, QString filename,const QObject *sender,const char* func,QNetworkReply* repcur,const char* func2="");
...
 repcur=manager->get(req);
 connect(repcur,SIGNAL(downloadProgress(qint64,qint64)),sender,func2);

QFile *file=new QFile(tasks[0]->updatefilename);
    QByteArray ss;
    if(file->open(QFile::Append)){
        qDebug()<<("file opened to write data");
        if(bytesReceived>0){
            ss=_pCurrentReply->readAll();
            file->write(ss);
        }
        file->flush();
        file->close();    }