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Re: Progress bar will not update.

Am 28.11.2007 um 02:34 schrieb Julie Porter:
void RegisterForEvents(WindowRef myWindow)
{
EventTypeSpec cmdEvent; cmdEvent.eventClass = kEventClassCommand;
cmdEvent.eventKind = kEventProcessCommand;
EventHandlerUPP handlerUPP;
handlerUPP = NewEventHandlerUPP(CommandEventHandler);

  EventTargetRef target;
      target = GetWindowEventTarget(myWindow);

  void * userdata = NULL;
  InstallEventHandler(target, handlerUPP, 1,  & cmdEvent,
      userdata,NULL);
}


A UPP is a structure that wraps a function pointer. As such, you only need it once for every function. What people generally do is define a UPP as static to a function, and then they can allocate it once, re-use it, and it gets disposed with the rest of the application on shutdown.

That said, many of the UPP calls compile down to no-ops on OS X, because they were mainly invented for calling 680x0 function on PowerPC Macs, and thus in many cases you can just pass a straight ProcPtr into UPP-expecting APIs.

Cheers,
-- M. Uli Kusterer
"The Witnesses of TeachText are everywhere..."


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References: 
 >Progress bar will not update. (From: Julie Porter <email@hidden>)
 >Re: Progress bar will not update. (From: Eric Schlegel <email@hidden>)
 >Re: Progress bar will not update. (From: Julie Porter <email@hidden>)
 >Re: Progress bar will not update. (From: Eric Schlegel <email@hidden>)
 >Re: Progress bar will not update. (From: Julie Porter <email@hidden>)



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