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From: dank@calvin.usc.edu (Dan King)
Newsgroups: comp.sys.mac.programmer
Subject: 32-bit Cleanliness
Message-ID: <29193@usc>
Date: 7 Jan 91 22:07:56 GMT
Sender: news@usc
Organization: University of Southern California, Los Angeles, CA
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I've got a question on the Politically Correct way to dereference a
resource.

Example (using C-ish syntax):
I call GetResource(blah) to get a handle to the resource.  I then
Detach() it and HLock() it.  What should I do to dereference it?
Should I kill the upper 8 bits (I don't think so), should I
StripAddress it (TN212 says not, but who knows?), or should I just go
ahead and dereference it (Ptr x; x=*handle;)?  HELP!!!!

I've read the technote on being 32-bit clean and the technote on
StripAddress.  Neither really tells me (explicitly) what I need to do.
I believe that just dereferencing the handle without worrying about
the upper 8 bits will work, but doesn't the resource manager use those
for different states (like locked, purgeable, etc)?  Or do those go
away when you detach the handle?

Thanks for putting up with boring questions,
dank