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++ to achieve full functional demo code, in full screen, you can set whether to display the main menu, if there are scroll bars, full-time is proportional to, and does not stretch the imag