In general, it is not safe to assume that errors from Cocoa frameworks are
cleared when an operation succeeds (in fact, I believe that they they are
almost never cleared). The only way to determine if "writeToURL" succeeds is to
test the return value (not the error). If the return value is YES, the error is
garbage. If the return value is NO, the error will have meaning.
NSError *error = nil;
BOOL success = [content writeToURL:aURL atomically:YES encoding:encoding
error:&error];
if (!success)
{
[NSApp presentError:error];
return NO;
}
Aaron
On Jun 23, 2012, at 10:50 AM, 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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