Keep a reference to a file after it has moved in objective-c?

Question

I have a Cocoa application that stores a reference to multimedia files (images, videos, etc) on the user\'s computer. I\'m wondering if there is a way to get a reference to

Answer 1

In OS X 10.6 (Snow Leopard), an NSURL can be converted to a file reference URL (using -[NSURL fileReferenceURL]) which references a file across moves while your application is running. If you want to persist this file reference, use +[NSURL writeBookmarkData:toURL:options:error:] passing the bookmark data generated with -[NSURL bookmarkDataWithOptions:includingResourceValuesForKeys:relativeToURL:error]. The bookmark can be resolved later with +[NSURL URLByResolvingBookmarkData:options:relativeToURL:bookmarkDataIsStale:error:] passing the bookmark data returned from +[NSURL bookmarkDataWithContentsOfURL:error:].

Prior to OS X 10.6, the same functionality (minus some network aware niceties) is available via the AliasManager, a Carbon-era interface to the OS X file alias system. There are a couple of Objective-C wrappers on top of the Alias Manager that make using it from Cocoa much nicer. My favorite is Wolf Rentzsch's additions to Chris Hanson's BDAlias (available on github).