QPixmap QImage 相互转化

QPainter p(this);
QPixmap pixmap;
pixmap.load("E:\参考文件\image\1.jpg");

//QPixmap->QImage
QImage tempImage = pixmap.toImage();
p.drawImage(0,0,tempImage);

QImage image;
image.load("E:\参考文件\image\1.jpg");

//QImage->QPixmap
QPixmap tempPixmap = QPixmap::fromImage(image);
p.drawPixmap(450,0,tempPixmap);