通过设置系统钩子，拦截关机消息，设置回调函数对注册表进行修改，实现程序下次开机自启动（开机启动后可以将注册表信息删除，这项可以自行实现，很简单）(By setting up the system hook, intercepting the shutdown message, setting the callback function to modify the registry, the program will start automatically next time. (After the boot is activated, the registry information can be deleted, which can be realized by itself, very simply.))