Hi, Use SendInput or mouse_event function to emulate mouse actions. Regards

sunyw_2006 wrote: I need to start/stop screensaver in my program, Please give me some hints how to do. Thanks. For Starting ScreenSaver you can post this message:- ::PostMessage(HWND_BROADCAST,WM_SYSCOMMAND,SC_SCREENSAVE,0); For Stoping it manually, Simulate Mouse Click at 0,0 position:- mouse_event(MOUSEEVENTF_LEFTDOWN,0,0,0,0);;     mouse_event(MOUSEEVENTF_LEFTUP,0,0,0,0);; "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow cheers, Alok Gupta VC Forum Q&A :- I/ IV Support CRY- Child Relief and You

sunyw_2006 wrote: Please help me how to send a custom message to a window service? Nishant Sivakumar has written a nice article on Windows Service. Apart from that take a look at ControlService and SERVICE_USER_DEFINED_CONTROL. Nibu thomas A Developer Programming tips[^]  My site[^]

Even if you can, don't. Where it displays will be indeterminate. The whole point of a service is that you don't need a UI. If you need a UI, you're not writing a service. Your best bet is to write a separate application for getting your messages, and pass messages to your service as necessary. Either that, or you can log to disk.

sunyw_2006 wrote: 1.During logged off, can the window service call the exe? 2.Can the window service receive "log off" message? 1. Nope. A service can of course not send messages to a terminated app. 2. Check out WM_ENDSESSION. MSDN: [^]

Is this the same question as above? - It's easier to make than to correct a mistake.