Actually, this should be quite possible by using document-scoped bookmarks. If 
Apple's documentation doesn't help you, you could have a look at the sample 
project linked here: 
http://stackoverflow.com/questions/10259692/app-sandbox-document-scoped-bookmark-not-resolving-not-returning-any-error/10964764#10964764

Cheers,

Tim

Am 13.06.2012 um 21:14 schrieb douglas welton:

> Hi All,
> 
> My application allows the user to navigate to a directory and read a 
> collection of image files. Once read, the user can arbitrarily keep any 
> subset of the acquired images.
> 
> Currently (un-sandboxed), I use NSFileManager to get the URLs for the files 
> in the directory. I store the returned URLs in my document data. When I 
> sandbox this app, using the stored URLs can be a no-op (unless they are in an 
> entitlement-friendly location: e.g., the Pictures folder).
> 
> I have tried creating security-scoped bookmarks before storing the individual 
> URLs.  However,  when I do this, I get a nil bookmark and the message "XPC 
> couldn't look up the Mach service for scoped bookmarks agent" is posted to 
> the console.
> 
> In order to play in the sandbox, I need a persistent security-scoped solution 
> for URLs derived from a user-selected URL.
> 
> From what I read in the App Sandbox Design guide, this is not possible.  Am I 
> correct?  Can anyone else who's run into this situation give me a 
> pointer/hint/suggestion about a work around?
> 
> curiously,
> 
> douglas
> 
> 
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