QPainter::begin: Paint device returned engine == 0, type:
2
QPainter::setCompositionMode: Painter not active
QPainter::end: Painter
not active, aborted
一般是由于QPainter操作的绘图对象为空，将绘图对象初始化即可。
QPainter::begin: Paint device returned engine == 0, type: 2,布布扣,bubuko.com
QPainter::begin: Paint device returned engine == 0, type: 2
原文：http://www.cnblogs.com/niebing/p/3724940.html