Transfer of a QByteArray to main.cpp

[dolin93]

Thanks for Your answers!
Also with the suggested changes

FileDownloader *demo = new FileDownloader(histUrl);
    mainWidget w;
    QObject::connect(demo,SIGNAL(DataA(const QByteArray&)),&w,
                     SLOT(Receiver(const QByteArray &)));    
    demo->start();
    w.show();

FileDownloader *demo = new FileDownloader(histUrl);
    mainWidget w;
    QObject::connect(demo,SIGNAL(DataA(const QByteArray&)),&w,
                     SLOT(Receiver(const QByteArray &)));    
    demo->start();
    w.show();

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the QByteArray is not available in mainwidget.cpp.