在图像显示过程中可以有两种显示方法：一种是利用系统内部函数PaintDIB使整幅图像直接显示；另一种是利用打点方法逐点的显示出整幅图像。-In the image display process can be displayed in two ways: one is to use the system internal function PaintDIB to directly display the whole image　the other is to use dot-by-point method shows that the whole image.