问题
I want my screensaver appears in the screensaver preview box?
回答1:
When you make a screen saver you need to support a command line argument (/p [HWND]) that will tell you in which windows to show your screen saver. The command line will be pass to you thru the screen saver control panel. here is a link to the full spec.
回答2:
You can start the screen saver, get it's window handle then change it's parent to your forms handle or panel's handle or wherever you want it.
来源：https://stackoverflow.com/questions/903180/how-to-make-a-screen-saver-preview-in-delphi