我在实现黑屏时用到SendMessage(Application->Handle,WM_SYSCOMMAND,SC_MONITORPOWER, 0); 但是SC_MONITORPOWER只适用98以下系统,在NT/2000下怎么实现? Windows 95 only: Sets the state of the display. This command supports devices that have power-saving features, such as a battery-powered personal computer.