VC++显示透明位图，在实际图像显示中常需要将图像某区域设置为透明色，该程序介绍前景位图中介绍如何设置椭圆和矩形区域为透明区域。-VC++ showed clear bitmap, in the actual image display in certain areas will need image set to transparent color, this program introduces prospects bitmap introduces how to set the ellip