On 09.08.2008, at 22:53, Jacob Bandes-Storch wrote:
I want to implement a custom URL scheme (such that myscheme:whatever
will open my app and somehow pass the URL as a parameter). I've been
looking around for information on how to do that, and I'm getting
mixed messages.
I'm not a specialist, but I'll provide what I think is correct:
The Info.plist documentation is very clear, and I've got the keys
all set up the right way such that my app opens when a URL of my
custom scheme is opened. However, I'm not sure how to find out what
URL was opened.
I see some implementations use -[NSAppleEventManager
setEventHandler:andSelector:forEventClass:andEventID:]; with
kInternetEventClass and kAEGetURL, and they implement a method
(passed into the selector): - (void)handleURLEvent:
(NSAppleEventDescriptor *)event withReplyEvent:
(NSAppleEventDescriptor *)replyEvent.
(...)
Another thing I've seen is adding a script suite and using
performDefaultImplementation and [self directParameter] to get the
URL.
When a URL is opened, an Apple Event of kInternetEventClass/
kAEGetURL is sent, containing the URL. If you want to handle the URL,
you'll need to catch this somehow.
Cocoa AppleScript support is fairly new (I think 10.2 or 10.3 or
thereabouts). So, depending on what system version your app has as its
minimal requirement, you'll either use NSAppleEventManager (which is
the older class, AFAIK) or the script suite. Instead of
performDefaultImplementation, I think you could also just create an
NSScriptCommand or whatever the class was called. Whatever feels
cleaner to you.
In other places, I see LSSetDefaultHandlerForURLScheme, and other
LS* stuff.
You'll want to use the default handler thing if your scheme is
likely to be shared with other apps. Like Safari, which lets you
specify the application to use for handling RSS feeds, either itself
or other apps, like NetNewsWire. These APIs let you explicitly set who
handles a scheme. Specifying it in the Info.plist means the system
decides who gets the URL, if there are several handlers. So, if this
is a scheme only your app will use (i.e. x-myapp-license: or x-myapp-
triggersoftwareupdate: or whatever), the Info.plist approach should be
enough. Again, the different approaches may have different system
requirements.
So, I need to know what the "right" way to do this is. I don't see
any specific information about this in Apple's documentation.
Hope this helps a bit. If anyone knows better, please correct me. I
haven't had to do that yet, that's just stuff I remember having read
in places.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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