VC++实现全屏功能演示代码，在全屏时，可以设置是否显示主菜单、是否出现滚动条，全屏时候是按比例来的，并不会拉伸图像-VC++ code to achieve full-screen feature shows, in full screen, you can set whether to display the main menu, scroll bars are there, full-screen time is proportional to and will not stretch t