c# - How can I intercept all key events, including ctrl+alt+del and ctrl+tab?

Question

I'm writing a screen saver type app that needs to stop the user from accessing the system without typing a password. I want to catch/supress the various methods a user might try to exit the application, but all research I do seems to point me to "you can't".

Anything in C# or C++ would be great. I've thought of disabling the keyboard, but then I would have other issues.

Answer 1

You can't. The whole point of Ctrl+Alt+Del is that only the system gets to handle it, 'cause that way the system can always handle it.

Fortunately, Windows has built-in support for password-protected screensavers (available as the "On resume, password protect" option in Display Properties, or via group policy). Just use that.