Martin,
Instead of inspecting the value of error, you should be inspecting the
return value of writeToURL:atomically:encoding:error:. Only if that returns NO
should you be inspecting the value of error which, as you’ve seen, may be
non-nil on success. You can see an example here:
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Strings/Articles/readingFiles.html#//apple_ref/doc/uid/TP40003459-SW5
Jeff Kelley
On Jun 23, 2012, at 1:50 PM, Martin Hewitson wrote:
> Dear list,
>
> I have an interesting bug report from a user of an app of mine. The app
> manages files and allows the user to edit them. When they save the project
> each file is saved to disk (if necessary). They are experiencing what appears
> to be a false positive of writeToURL:atomically:encoding:error:. The file
> actually does save, but the error comes back non-nil and when presented says:
>
> "You don’t have permission to save the file “XXX” in the folder “YYY”.
>
> The piece of code I use is
>
> NSError *error = nil;
> [content writeToURL:aURL atomically:YES encoding:encoding error:&error];
> if (error) {
> [NSApp presentError:error];
> return NO;
> }
>
> By giving the user a debug version of the app with lots of NSLog statements,
> we narrowed it down to the above code. So even though the file is saved,
> 'error' comes back non-nil.
>
> Has anyone seen such behaviour before, or does anyone have any idea how to
> further investigate this?
>
> Best wishes,
>
> Martin
>
>
>
>
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