A lot of applications out there are not yet UTI based and still rely
on "old" application Info.plist contents (the type is defined at the
same time as the application's role for this type).
As defining a type should be independent of its application, the new
approach is:
1) define tags -> type mapping
2) define type -> role mapping
So, the Info.plist "new-style" should look like:
<!-- application defines what types it handles and how -->
<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeRole</key>
<string>Viewer</string>
<key>LSItemContentTypes</key>
<array>
<string>com.apple.ichat.transcript</string>
</array>
<key>NSDocumentClass</key>
<string>ChatDoc</string>
</dict>
</array>
<!-- application, or someone else, defines what
com.apple.ichat.transcript is -->
<key>UTExportedTypeDeclarations</key>
<array>
<dict>
<key>UTTypeIdentifier</key>
<string>com.apple.ichat.transcript</string>
<!-- what it is -->
<key>UTTypeConformsTo</key>
<array>
<string>public.message</string>
<string>public.data</string>
</array>
<key>UTTypeDescription</key>
<string>Chat transcript</string>
<key>UTTypeIconFile</key>
<string>savedChatFile.icns</string>
<!-- how it is recognized -->
<key>UTTypeTagSpecification</key>
<dict>
<key>public.filename-extension</key>
<array>
<string>ichat</string>
<string>chat</string>
</array>
<key>com.apple.ostype</key>
<array>
<string>chat</string>
</array>
</dict>
</dict>
</array>
For the new kind of bundles (e.g. Spotlight importer and Quick Look
generators), this approach is mandatory.
The fact that LS might be less "efficient" at mapping tags to types
than mapping tags to applications should be considered a bug (or a
feature).
--
Julien
On 16 févr. 08, at 02:59, Matt Hoffman wrote:
Yes, they have an HFS creator and type. I realize the finder is
using that to display the icon and decide
which application to launch. I guess my question is: Does the Finder
also use UTIs via LaunchServices
for this purpose? If so, it seems to have a more graceful way of
dealing with multiple UTIs with the same
extensions since it is looking at both the Type and UTI.
On Feb 15, 2008, at 4:35 PM, Sean McBride wrote:
On 2/15/08 3:11 PM, Matt Hoffman said:
I realize it is slightly off topic, but why doesn't the Finder have
this problem? It shows my icons properly and launches the correct
app
when I double-click on one of my .img files. Does the Finder not use
LaunchServices?
Do your files have an HFS creator? The creator does not influence
the
UTI, but does influence the icon the Finder uses, and the app it
launches with, I believe.
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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