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Re: Event Handler UPP question

On Aug 26, 2003, at 3:44 PM, Bryan Pietrzak wrote:
On Tuesday, August 26, 2003, at 05:22 PM, Bob Sabiston wrote:
Do the calls to NewEventHandlerUPP() reserve memory that I should be freeing? When should I free it? If the function that installs the handlers gets called many times, do I have a memory leak?

Yes you probably have a leak.

Leaks pre-MacOSX. No leak on MacOSX. Compare the values of handlerUPP and MyHandler in your sample running on X.

You only need one UPP for any callback. I use a static variable and do this:

{
static EventHandlerUPP handlerUPP = NewEventHandlerUPP(MyHandler);

verify_noerr(InstallApplicationEventHandler(handlerUPP, GetEventTypeCount(events), events, (void *) this, NULL));
}

There's a macro for this in CarbonEvents.h:

/*
You can use the following macro in your code to allow you to set up an
event handler lazily. You pass the name of your event handler in. You should
use this with caution on Mac OS 9 systems since it could cause heap fragmentation.
*/
#define DEFINE_ONE_SHOT_HANDLER_GETTER( x ) \
EventHandlerUPP Get ## x ## UPP() \
{ \
static EventHandlerUPP sHandler = NULL; \
\
if ( sHandler == NULL ) \
sHandler = NewEventHandlerUPP( x ); \
\
return sHandler; \
}
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 >Re: Event Handler UPP question (From: Bryan Pietrzak <email@hidden>)



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