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Tell if an OS feature exists?

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Tell if an OS feature exists?

Subject: Tell if an OS feature exists?
From: "Mike O'Connor" <email@hidden>
Date: Sun, 10 Apr 2005 23:45:33 -0400

My Cocoa app works fine in the latest system, but it uses a feature that is not in earlier systems. How can I tell at runtime if it is there or not?

Should I check the system version? This seems crude.

I use NS... classes that are not in older systems. Can I test to see if the NSSomething (AppKit) class exists, if so how?

I use stuff in a system framework that isn't there in older versions. How do I test to see if it exists?

TIA!

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