On Dec 20, 2006, at 10:12 PM, Brian Stevens wrote:
>

> The text in the reference manual for Def ChangedResource is  
> somewhat illuminating (USR ReplaceResource calls this). USR  
> ReplaceResource copies the handle.  Also, (just skimming) the USR  
> code does not call CloseResFile or UpdateResFile (CloseResFile  
> calls update first, so it is unnecessary in that case)  but just  
> marks it as changed with the DEF ChangedResource calls.  The  
> CloseResFile call releases the memory for the resource handles, so  
> maybe the app accumulates too many and finally crashes. Doing 250  
> CloseResFiles is not my recommendation  but strategically placed  
> might improve matters.   The old resource manager calls  probably  
> haven't changed from OS X 10.3 to 10.4, so the difference from one  
> machine to another is probably related to more or less memory being  
> available and not the OS version per se. 250 USR ReplaceResource  
> calls sounds excessive to me. I'd find a way to reduce this  
> regardless because your users will probably manipulate images  
> larger than those used in testing and the crash will come earlier.
>
> Only seeing one line of your code this is the best I can do.
>
> Brian S.

Thanks Brian,

I think I will try closing and reopening the resource file  
periodically and see if that helps. I could change my slider control  
so it does not update dynamically. Then the number of times the  
resource would be replaced would become small, but I would hate to  
give that up. It is nice the way the colors in the preview change as  
the sliders are moved back and forth. I wish I had asked this  
question two days ago. I am off for Christmas so I don't have access  
to my work computer until next week.


On Dec 21, 2006, at 12:54 AM, Robert Purves wrote:
>

> In OS X 10.4, a resource tends to become corrupted if more than 16  
> MB of changes are made without a call to UpdateResFile. I don't  
> know if this limit is different in 10.3, or how it relates to your  
> 250 calls (16 MB/250 ≈ 64 K).
>
> Immediately after your call
>    pictHndl& = USR ReplaceResource( pictHndl&, _"PICT",  
> _prevIconTemp, "tempIcon", gExternalGradientResource)
> add this line
>    UpdateResFile( gExternalGradientResource )
> to see if it repairs the problem.
>
> Robert P.

I think I did try calling UpdateResFile and it did not help. Maybe  
CloseResFile will do the trick.

-Joe