Re: File UTI on 10.6.8
Re: File UTI on 10.6.8
- Subject: Re: File UTI on 10.6.8
- From: Martin Hewitson <email@hidden>
- Date: Tue, 03 Jan 2012 11:04:55 +0100
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@hidden
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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