Get the QPixmap from a QLabel

Question

I have a QLabel called Picture which Pixmap has been set to a QImage.
I now want to modify the image in another funct

Answer 1

I think you shall check the return value of the pixmap() function.

const QPixmap* pixmap = ui.Picture->pixmap();
if ( pixmap )
{
    QImage image( pixmap->toImage() );
}

Maybe you just called the function when the image was not set and that caused the exception.