Hello….
I have a Mac app that is launched via a URL handler that is installed. The
launch services / configuration setup of the URL handler is fine, app launches
just as expected. However, I am seeing an intermittent problem where the URL
handling method:
- (void)handleGetURLEvent:(NSAppleEventDescriptor *)event
withReplyEvent:(NSAppleEventDescriptor *)replyEvent;
is invoked after the app delegate method:
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification;
Normally, handleGetURLEvent is invoked first, which is important, because the
implementation of that method is usually needing to capture the URL used to
launch it, for later processing. That is exactly my case, and when the
applicationDidFinishLaunching method is invoked first, the app fails, because
it doesn't have the launch URL which has information needed to run the app.
So far, this problem seems isolated to Snow Leopard, I have not seen it on Lion
or Mountain Lion. Also, the problem is intermittent -- it works just fine most
of the time, even on the same machine where the problem occasionally occurs. My
questions:
1. Is there any guaranteed invocation order of these methods, or is it
completely random? I cannot think of any scenario where you'd want to process
the URL launching event *after* the callback which signifies app launch
completion. That just seems wrong.
2. Assuming that the answer to 1 is that there IS an expected invocation order,
then what could possibly cause this problem? This smells an awful lot like
something to do with unexpected results of thread scheduling in the OS (not in
the app, I'm creating no threads at all).
If anyone has any thoughts or ideas, I'd greatly appreciate it. Even if any of
you have a similar use-case of an app with a URL handler that has to grab that
URL before doing anything in your app, sharing your experience might help.
Thanks,
Brad
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