Qt把当前窗口的内容保存为一张图片

1、怎么把QWidget的窗口内容保存成图片?

QPixmap::grabWidget(QWidget);

2、怎样把QGraphicsView窗口的内容保存成图片?

QSize mysize(m_pScene->width(), m_pScene->height()); //获取 QGraphicsScene.size

QImage image(mysize, QImage::Format_RGB32);

QPainter painter(&image);

m_pScene->render(&painter);

image.save(pathname, "PNG", -1);