Re: UTI Example
Re: UTI Example
- Subject: Re: UTI Example
- From: Jonathan Dann <email@hidden>
- Date: Sat, 23 Aug 2008 11:52:56 +0100
Reposted due to 25KB size limit. Sorry.
On 23 Aug 2008, at 06:42, Adam Thorsen wrote:
Are there any examples of using the UTI API to determine the UTI
given a path to a file?
Thanks,
-Adam
In my app I have a singleton UTI controller class that has an NSArray
property of UTIs supported by my application. There's also a
dictionary that maps the Core Data entities that I use to represent
each file type at runtime. Here are the methods of my UTI controller,
hope they help. I've replaced most of the string constants with
external declarations already but a couple are still constant
strings. They show how to use -[NSWorkspace type:conformsToType:] and
-[NSWorkspace typeOfFile:error:]
As for your info.plist file, and exported and imported declarations,
there's a good article here:
http://developer.apple.com/documentation/Carbon/Conceptual/understanding_utis/understand_utis_conc/chapter_2_section_4.html
- (id)init;
{
if (![super init])
return nil;
self.supportedUTIs = [NSArray arrayWithObjects:(NSString
*)kUTTypePlainText
,kUTTypeTex,kUTTypeTeXShopTex,kUTTypeBib,kUTTypeBibDeskBib,(NSString
*)kUTTypePDF,(NSString *)kUTTypeImage,kUTTypeEPS,nil];
self.utiEntityNameMap = [NSDictionary dictionaryWithObjects:[NSArray
arrayWithObjects:ESTexFileEntityName
,ESTexFileEntityName
,ESTexFileEntityName
,@"BibTexFile
",@"BibTexFile
",ESPDFFileEntityName,ESImageFileEntityName,@"EPSFile",nil]
forKeys:self.supportedUTIs];
return self;
}
- (NSString *)isSupportedUTI:(NSString *)uti error:(NSError
**)errorPointer;
{
for (NSString *supportedUTI in self.supportedUTIs)
if ([[NSWorkspace sharedWorkspace] type:uti
conformsToType:supportedUTI])
return supportedUTI;
if (errorPointer != NULL)
*errorPointer = [NSError errorWithDomain:ESScribblerErrorDomain
code:ESUnsupportedUTIErrorCode userInfo:[NSDictionary
dictionaryWithObjectsAndKeys:NSLocalizedString
(@"",@""),NSLocalizedDescriptionKey
,NSLocalizedString
(@"",@""),NSLocalizedRecoverySuggestionErrorKey
,uti,ESUnsupportedUTIErrorKey,nil]];
return nil;
}
- (NSString *)isSupportedFile:(NSString *)filepath error:(NSError
**)errorPointer;
{
NSString *uti = [[NSWorkspace sharedWorkspace] typeOfFile:filepath
error:errorPointer];
if (!uti)
return nil;
return [self isSupportedUTI:uti error:errorPointer];
}
- (NSString *)entityNameForFile:(NSString *)filepath error:(NSError
**)errorPointer;
{
NSString *supportedUTI = [self isSupportedFile:filepath
error:errorPointer];
if (!supportedUTI)
return nil;
return [self.utiEntityNameMap valueForKey:supportedUTI]; // leave
this error as nil, if we've got this far then we can determine the UTI
}
/*
Maps the UTIs for the files and create a dictionary of entity name
values and filepath keys. All errros are put into an NSDictionary. It
is guaranteed to return a dictionary, so clients must inspect both the
errors dictionary and the count of the returned dictionary.
This method can't reasonably return nil as the presence of errors
does not preclude the presence of supported files. To return nil if
there are errors is too simplistic.
*/
- (NSDictionary *)entityMapForFiles:(NSArray *)filepaths errors:
(NSDictionary **)dictionaryPtr;
{
NSMutableDictionary *mutableErrorsDictionary = [NSMutableDictionary
dictionary];
NSMutableDictionary *mutableEntityMap = [NSMutableDictionary
dictionary];
for (NSString *filepath in filepaths) {
NSError *entityError = nil;
NSString *entityName = [self entityNameForFile:filepath
error:&entityError];
if (!entityName)
[mutableErrorsDictionary setObject:entityError forKey:filepath];
else
[mutableEntityMap setObject:entityName forKey:filepath];
}
if ([mutableErrorsDictionary count] != 0 && dictionaryPtr != NULL)
*dictionaryPtr = [[mutableErrorsDictionary copy] autorelease];
return [[mutableEntityMap copy] autorelease];
}
Jonathan
http://espresso-served-here.com
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| References: | |
| | >UTI Example (From: Adam Thorsen <email@hidden>) |