My suggestion is that you simply don't load the compositions that
begin with "User Backdrops".
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Well, the plugins I'm trying to load don't begin with "User
Backdrops"; there are several in the /System/Library/Compositions
folder - e.g., Yosemite. I mean, that folder is intended to be
public, no? Anyway.. thanks for all of the help all of you have
provided.
Apple introduced the concept of system- and user-compositions in
Leopard. There is now a QCCompositionRepository class that should be
used to load these compositions. I never used it myself, but according
to the docs, it only loads .qtz files from /Library/Compositions and ~/
Library/Compositions, but not from /System/Library/Compositions.
When Apple gives you an API to do what you are trying to do yourself
right now, and they are specifically not including the compositions
in /System/Library/Compositions, I wouldn't take the chance and load
them just like that. If I were you, I'd do a [[QCCompositionRepository
sharedCompositionRepository] allCompositions] and then *maybe* load
specific .qtz files from /System/Library/Compositions (only those you
know are safe and you really want to use) with their names more or
less hard coded into your App, so you can be sure that a future OS
update won't interfere with your loading mechanisms.
Marco
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