回帖：zcshou:程序运行后，出现下面的提示，是哪里的原因啊
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setPen: Painter not active
....... (2014-03-03 19:48) 
看看paintEvent里面的代码，逐步调试，看QPainter是否有指定的绘制窗口