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Re: One instance of app running

If you duplicate the app, that duped copy is a separate file which can make a separate instance of the app. That's by design.

File associations are not bound to a path. The app can be found by the OS no matter where it lives. (I believe Launch Services maintains an alias to the app, but that is just a guess... anyway, it doesn't matter, that part "just works.")


On Jan 12, 2007, at 2:00 PM, Daniel Birns wrote:



John,

You're right. Using XCode this happened all the time.
Also, it appears to happen if you have copied the app to 2 different locations, and click on both the different locations.

Which brings up a related issue: currently we're planning to distribute with a .DMG file that contains the app and perhaps a readme file with the expectation that the user will know to copy this to a convenient place: perhaps the desktop, perhaps the Applications folder. Is this a reasonable assumption? And if so, what happens if they move it later? In particular, the file associations seem to be to a particular path to the app, and if that path changes, what happens to the file associations?

--Daniel



---------------------------------------- 
CC: email@hidden
From: email@hidden
Subject: Re: One instance of app running
Date: Fri, 12 Jan 2007 13:35:54 -0800
To: email@hidden

Perhaps your application bundle is set up wrong?
Without going to extreme measures it's usually not possible to make a
Mac app which can launch multiple instances.


On Jan 12, 2007, at 1:26 PM, Daniel Birns wrote:


All,

I need to ensure that there's only one instance of my app running.
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.

--Daniel
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References: 
 >RE: One instance of app running (From: Daniel Birns <email@hidden>)



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