On 3, Jan, 2012, at 09:42 AM, Quincey Morris wrote:
> On Jan 2, 2012, at 23:57 , Martin Hewitson wrote:
>
>> I want to check if a file extension is registered as a text file. So I made
>> a little category method on NSString like this:
>>
>> - (BOOL)isText
>> {
>> BOOL fileIsText = NO;
>>
>> CFStringRef fileExtension = (CFStringRef) self;
>> CFStringRef fileUTI =
>> UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,
>> fileExtension, NULL);
>> if (UTTypeConformsTo(fileUTI, kUTTypeText)) {
>> fileIsText = YES;
>> }
>> CFRelease(fileUTI);
>>
>> return fileIsText;
>> }
>>
>> This works fine on 10.7. On 10.6.8 when
>>
>> self = @"tex"
>>
>> this returns NO and fileUTI is dyn.age81k3p2.
>>
>> Anybody got an idea what this dyn.* means?
>
> Well, you don't need to ask *us* when the answer in the the documentation for
> the 'UTTypeCreatePreferredIdentifierForTag' function:
>
>> "If no result is found, this function creates a dynamic type beginning with
>> the dyn prefix. This allows you to pass the UTI around and convert it back
>> to the original tag."
Oops. Completely missed that. Even after reading your post it took me a while
to see it. Probably time for another coffee.
>
> OTOH, I doubt that you really want to *create* a UTI just to test
> conformance, especially since you immediately discard the created UTI. What's
> wrong with using one of the NSWorkspace methods, such as
> 'filenameExtension:isValidForType:'?
Thanks! I didn't know about this NSWorkspace method. I think a google search
got me to the solution I was using.
Anyway, thanks, I'll try the NSWorkspace method.
Cheers,
Martin
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: [email protected]
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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