How to lock the screen in Windows?

Usually I develop in Java but now I need to write an app that will block the whole computer's screen every X minutes for Y minutes. It needs to make a break (I want to have a similar app in Windows like in Linux).

So I suggest I need to use C++ and User32.dll to achieve it? Am i right? (I don't want to develop an application in C#). Coul开发者_如何转开发d anybody give me an idea which methods to use to lock the screen, I'm a newby in WinAPI developing.

Thank you!

Just link your application to user32.dll and call the LockWorkStation() function directly.