It is a bit of a knotty problem. I've ended up with:
- (BOOL)ks_isEqualToURL:(NSURL *)otherURL;
{
BOOL result = [self isEqual:otherURL];
// For file: URLs the default check might have failed because they reference
the host differently. If so, fall back to checking paths
if (!result && [self isFileURL] && [otherURL isFileURL])
{
result = [[self path] isEqualToString:[otherURL path]];
}
return result;
}
From here:
https://github.com/karelia/KSFileUtilities/blob/master/KSURLUtilities.m
Part of the problem really is expressing what equality you actually want to
test. For example, it's perfectly legal for a file URL to have a query or
fragment. But the filesystem will ignore that, rendering it obsolete for a URL
comparison. Thus the only safe way to test equality as you want here is to
compare paths.
On 28 May 2011, at 00:13, Sean McBride wrote:
> Hi all,
>
> What is the correct way to test if two NSURLs refer to the same file
> system object?
>
> I've just learnt the hard way that one can have two URLs that refer to
> the same file system object but because they are subtly different,
> isEqual: returns NO:
>
> ex:
>
> <file://localhost/Volumes/Disk/Users>
> vs
> <file:///Volumes/Disk/Users>
>
> isEqual: returns NO. I guess this makes some sense, but it's not the
> kind of equality I'm looking for.
>
> What would best practice be? Convert to full path, and compare those?
> Note: I'm not concerned about resolving symlinks or aliases.
>
> (Aside: I was surprised to see that there is no isEqualToURL:, analogous
> to isEqualToString, isEqualToSet, etc. I wonder why...)
>
> Thanks,
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng s...@rogue-research.com
> Rogue Research www.rogue-research.com
> Mac Software Developer Montréal, Québec, Canada
>
>
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