Am 13.01.2007 um 21:00 schrieb Daniel Birns <email@hidden>:
All,
I need to ensure that there's only one instance of my app running.
Worldwide? In a LAN? On the machine? In one user context?
It makes a difference because you can have multiple users log in to
the machine at the same time and each one of them can normally launch
the same apps.
So what is the reason you only want a single instance of your app?
Depending on your answers you could try to use some sort of lock
which the first running instance of your app sets on launch and
deletes on quit. But this is tricky because you need to clear the
lock even if the app crashes or if it gets terminated by a kill -9
signal.
Or you could search for other running copies of your app using the
bundle id or creator code. This will likely only work within one
users session. For a mchine wide search you probably need to use some
sort of notification system or a network based solution. Bonjour
might help to find the other instances for example.
Some of this seems to happen automatically -- for example, if I
click on my doc-type, it starts up the app if it's not running, or
sends an open doc event to it if it is running. But if I click on
the app it starts another instance, and this is what I don't want
to have happen. Instead, I'd like it to turn into a reopen apple
event to the existing instance.
Others have already commented on these points.
HTH
Mike
--
Mike Fischer Softwareentwicklung, EDV-Beratung
Schulung, Vertrieb
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