When I did a little work in this area a few weeks ago, I found that
just adding a UTI to a document type caused -[NSDocumentController
defaultType] to return nil. I posted on this list but no one knew the
answer. It might be relevant to your issue...
http://www.cocoabuilder.com/archive/message/cocoa/2009/3/30/233397
Also, I found myself hopelessly confused because it seemed to me that
the documentation and method signatures use the same word "type"
indiscriminately to mean three different things:
* Name
* UTI
* filename extension
(Now, just so I don't commit the same sin, I define these as the
attributes you see in Xcode's Target Inspector > Properties tab, the
first three columns, respectively.)
I ended up writing my own little method to get the opposite conversion
of what you want. Maybe this will help you write a similar method to
for your purposes...
/*!
@brief Returns the first file extension listed in Info.plist for
a given
document-type.Name of the current application, or nil if this does
not exist.
@details In this context, document-type.Name refers to the
attribute shown
as the "Name" column in Xcode's Target inspector > Properties, and
is also
what is returned by, for example,
[[NSDocumentController sharedDocumentController] defaultType].
*/
+ (NSString*)fileExtensionForDocumentType:(NSString*)docType ;
+ (NSString*)fileExtensionForDocumentType:(NSString*)docType
{
NSArray* docTypeDics = [[NSBundle mainBundle]
objectForInfoDictionaryKey:@"CFBundleDocumentTypes"] ;
NSString* extension = nil ;
for (NSDictionary* docDic in docTypeDics) {
NSString* aDocType = [docDic
objectForKey:@"CFBundleTypeName"] ;
if ([aDocType isEqualToString:docType]) {
NSArray* extensions = [docDic
objectForKey:@"CFBundleTypeExtensions"] ;
if ([extensions count] > 0) {
extension = [extensions objectAtIndex:0] ;
}
break ;
}
}
return extension ;
}
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