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Re: CGDisplayReconfigurationCallBack

Subject: Re: CGDisplayReconfigurationCallBack
From: Jean-Daniel Dupas <email@hidden>
Date: Sun, 30 Mar 2008 16:05:24 +0200
Delivered-to: email@hidden
Delivered-to: email@hidden

It does not say to not use longjmp, it sais to not use longjmp to jump outside this function.

Just encapsulate your code in a @try / @catch() block to ensure that even if an exception occurs (@throw use longjmp in the 32 bits runtime), it will jump in your catch block and not outside your callback. In the same way, if you are using C++ call in the call back, you have to use a try/catch block to avoid that an exception trigger a non- local return.

Le 30 mars 08 à 15:31, Trygve Inda a écrit :

void MyDisplayReconfigurationCallBack (
  CGDirectDisplayID display,
  CGDisplayChangeSummaryFlags flags,
  void *userInfo
);
Your callback function should avoid attempting to change display configurations, and should not raise exceptions or perform a non- local return such as calling longjmp.


Does this mean I should stuff display and flags into a dict and use
something like

- (void)performSelector:(SEL)aSelector withObject:(id)anArgument
afterDelay:(NSTimeInterval)delay

How can I ensure a longjmp is not used here?

Thanks,

Trygve


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References:
	>CGDisplayReconfigurationCallBack (From: Trygve Inda <email@hidden>)

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