可选倒计时和定时关机两种方式 MFC开发，没有采用提升应用程序权限，最后关机调用的是系统命令，所以最后生成的exe文件请不要和系统命令shutdown重名-Optional countdown and time off in two ways MFC development, the application did not enhance the authority, the final system shutdown command is called, so I finally gene