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The best way to determine if my app is already running
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The best way to determine if my app is already running


  • Subject: The best way to determine if my app is already running
  • From: John Stiles <email@hidden>
  • Date: Fri, 4 Jun 2004 15:36:05 -0700

I have an app where its personality is largely data-driven--it can be totally different to the end user based on data within the bundle. But the code is all the same. Several copies of this app can be running simultaneously.
I want to be able to detect if a certain personality of the app is active, and then switch to it if it is. I can't base it on something like bundle identifier or application signature, since like I was saying, the code is always identical.
So what's the easiest way to register some global system property that would allow me to connect an identifier (i.e., a product name specified in my data) with a running app? So I could say "Is there a personality Foo active?" and it could say, "Yes, and here is its ProcessSerialNumber." I am open to either Carbon or Cocoa concepts (my app is mostly Cocoa based, but I come from a long Carbon background).
I thought about registering an NSPasteboard with a custom name, but that might stick around if my app is forcibly quit, and then I'd have stale information. That might be OK (I can check if the ProcessSerialNumber is no good).
In OS 9, I could have made a global Gestalt entry, but that's history.
Any ideas? Thanks :)
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