Prevent Shutdown/Sleep on Macs

I need to be able to implement methods to prevent these from happening:

• Shutdown
• Restart
• Logoff
• Sleep

On a Mac, I am using Xcode but can't seem to figure out the code to perform these actions.

开发者_如何学运维Can anyone help me out here?

I found this : http://developer.apple.com/library/mac/#qa/qa1134/_index.html

but I can't seem to understand how to block the system events when they are triggered.

Thanks

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In Carbon's Application Manager, there's the SetSystemUIMode API which lets you control (disable) things like force-quit, the power-key window etc. It's intended for kiosk style applications and described in this tech note.

Disabling sleep, screen-saver, etc. is done by periodically calling UpdateSystemActivity. See this tech Q&A.

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The simple and most effective way to prevent Apple OSX to sleep is the Terminal command:

   $ pmset noidle
   Preventing idle sleep (^C to exit)...

The only annoying thing maybe the user self has to end this manually by issuing a 'Control-C'.