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POTesting file existence using NSURL
 

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    <p>Snow Leopard introduced many new methods to use NSURL objects to refer to files, not pathnames or Core Services' FSRefs.</p> <p>However, there's one task I can't find a URL-based method for: Testing whether a file exists. I'm looking for a URL-based version of <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html#//apple_ref/occ/instm/NSFileManager/fileExistsAtPath:" rel="noreferrer">-[NSFileManager <code>fileExistsAtPath:</code>]</a>. Like that method, it should return <code>YES</code> if the URL describes anything, whether it's a regular file, a directory, or anything else.</p> <p>I could attempt to look up various <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSURL_Class/Reference/Reference.html#//apple_ref/occ/instm/NSURL/resourceValuesForKeys:error:" rel="noreferrer">resource values</a>, but none of them are explicitly guaranteed to not exist if the file doesn't, and some of them (e.g., <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSURL_Class/Reference/Reference.html#//apple_ref/doc/c_ref/NSURLEffectiveIconKey" rel="noreferrer">NSURLEffectiveIconKey</a>) could be costly if it does.</p> <p>I could just use NSFileManager's <code>fileExistsAtPath:</code>, but if there's a more modern method, I'd prefer to use that.</p> <p>Is there a simple method or function in Cocoa, CF, or Core Services that's guaranteed/documented to tell me whether a given file (or file-reference) URL refers to a file-system object that exists?</p>
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