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Re: CGDisplayReconfigurationCallBack
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Re: CGDisplayReconfigurationCallBack


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


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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