Question Event when user is shutdown or logoff

It seems that the OnApplication won't get call when user is shutdown or logoff, it there a way to watch there event in unity, so we can ensure things get saved when the app is closed?

 

Do you have don't destroy on your object that uses it? It might get destroyed before the OnappExit gets called. We use this event in our game and don't have problems with it not being called.

 

Thanks for replay, but my problem is how to detect the user is shutting down the computer or logoff, it seems that unity won't deal with these system events.

 

Ah sorry, missed that.

https://stackoverflow.com/questions/6799955/how-to-detect-windows-shutdown-or-logoff

Edit: though if computer shuts down Onexit should be called since that exists the program

 

I tried that example too, but the SystemEvents.SessionEnding don't get fire on Unity, however when I create a WinForm solution, it works fine, so I am confused, wasn't standalone built by Unity a form?