CocoaDev

My Cocoa application should be able to open any plain text document, even without an extension. I have for example a file created with MacSOUP which has TEXT for OSType but I can not manage to make it selectable in my openPanel without enabling other files like pdf, tiff, etc. The file is listed in the finder as a plain text document so I really can not understand why I can not select it in my openPanel from my NSDocument based cocoa application. I tried various entries in my info.plist file but none of them work. This is my current version. Any ideas of what I’m doing wrong?

<key>CFBundleDocumentTypes</key>
<array>
	<dict>
		<key>CFBundleTypeExtensions</key>
		<array>
			<string>txt</string>
		</array>
		<key>CFBundleTypeMIMETypes</key>
		<array>
			<string>text/plain</string>
		</array>
		<key>CFBundleTypeName</key>
		<string>SceneDocument</string>
		<key> CFBundleTypeOSTypes</key>
		<array>
			<string>TEXT</string>
			<string>TXT </string>
		</array>
		<key>CFBundleTypeRole</key>
		<string>Editor</string>
		<key>NSDocumentClass</key>
		<string>SceneDocument</string>
	</dict>
</array>

You should specify a UTI (UniformTypeIdentifier). These should (and probably will) be more commonly used on Mac OS X in the future than OSTypes, although they haven’t been given much publicity. Tiger has full support for UTIs.

In your case, use public.plain-text. That should get things working correctly, at least on 10.4.

– DustinMacDonald

Yes, thanks. This is working when I start a new project but it won’t work in my existing project. I’ll have to investigate what is wrong. In any case, this is what I was looking for.