Typically, as soon as I posted my question I figured out the answer. So, to
answer my own question, the difference between NSFileWrapper's -deprecated
-initSymbolicLinkWithDestination: method and its new
-initSymbolicLinkWithDestinationURL: method is that the older method
automatically sets the preferredFilename and the newer method does not (and the
preferredFilename is necessary for the image to be automatically set for the
attachment cell). So, whereas on 10.5 and earlier you would write:
NSFileWrapper *fileWrapper = [[NSFileWrapper alloc]
initSymbolicLinkWithDestination:myPath];
on 10.6 you need to write:
NSFileWrapper *fileWrapper = [[NSFileWrapper alloc]
initSymbolicLinkWithDestinationURL:[NSURL fileURLWithPath:myPath]];
[fileWrapper setPreferredFilename:[myPath lastPathComponent]];
Apologies if that was obvious to the rest of the world and his dog, but it had
me stumped for a little while there.
All the best,
Keith
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