Qpainter: Begin: paint device returned engine = 0, type: 1

By default, qpainter can only be called in paintevent,:

Draw a form in other events with the following prompt:
Qpainter: Begin: paint device returned engine = 0, type: 1

The painting operation should be completed in paintevent.

There is a property value. You can set it in the constructor to draw out of paintevent:

This-> setattribute (QT: wa_paintoutsidepaintevent );

But only X11 is supported. For Windows, Mac OS X or embedded Linux .... Not Supported

Void XX: paintevent (qpaintevent * P)

{

Painter. Begin (this );

Painter. drawimage (image );

Painter. End ();

}

By default, qpainter can only be called in paintevent,:

Draw a form in other events with the following prompt:
Qpainter: Begin: paint device returned engine = 0, type: 1

The painting operation should be completed in paintevent.

There is a property value. You can set it in the constructor to draw out of paintevent:

This-> setattribute (QT: wa_paintoutsidepaintevent );

But only X11 is supported. For Windows, Mac OS X or embedded Linux .... Not Supported

Void XX: paintevent (qpaintevent * P)

{

Painter. Begin (this );

Painter. drawimage (image );

Painter. End ();

}