Normally, if a URL-handling app is not running, and user visits a URL with that
app's scheme, Mac OS X launches the app. My app's URL handler only works when
my app is running. That's not so bad, but I have one user reporting that it
*never* works. I presume the issues are related and need to understand what's
going on.
If I "visit" a URL with my app's scheme in Safari, while my app is *not*
running, Safari displays a page saying "Safari can't open … because OS X
doesn't recognize internet addresses starting with <myUrlScheme>".
I understand that registered URL schemes are persisted in Launch Services plist
files. When I run this command…
defaults read com.apple.LaunchServices LSHandlers | grep LSHandlerURLScheme
I get about 20 URL schemes: http, https, mailto, github-mac, etc., including
some targeting apps that I haven't used in years. But my app's url scheme
*never* shows up in there. Why not?
Now, my app itself does not handle the URL directly. The URL handler is
actually installed in a faceless helper app which is in the main app's
Contents/Helpers/ directory. (This was done so I could control whether or not
my app is activated.) Here is the code:
NSAppleEventManager *appleEventManager = [NSAppleEventManager
sharedAppleEventManager] ;
[appleEventManager setEventHandler:self
andSelector:@selector(handleGetURLEvent:withReplyEvent:)
forEventClass:kInternetEventClass
andEventID:kAEGetURL] ;
Also, the trouble started with this particular user when he installed an update
in which I had changed the *name* of the helper. So I was wondering if maybe
Launch Services still had the old name, but that's when I found out that in
fact it had neither.
Why might my URL handler not be persistent?
Thanks,
Jerry Krinock
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