'How to discard command+shift+Q command in mac OS X objective c code?

I'm trying to implement a screensaver simulator on Mac OS X , I managed to disable the effect of pressing command+Q that was causing the application to exit, so now if it's in the full screen mode, it will not respond to the quit keyboard shortcut.

But, my problem is in handling the shortcut of ( Command+ Shift+Q) that pops up the confirmation dialog of Max OS X that warns exiting all the apps and logging of the system.

Can anyone help me in preventing the effect of command+shift+q shortcut while being in full screen mode ?

thanks

objective-cmacoskeyboard-shortcutsnseventkey-events


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