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Re: Gracefully failing on unsupported OS version
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Re: Gracefully failing on unsupported OS version


  • Subject: Re: Gracefully failing on unsupported OS version
  • From: Ali Ozer <email@hidden>
  • Date: Mon, 18 Apr 2005 11:13:37 -0700

In addition to setting the LSMinimumSystemVersion key as others have described, you can do one of several things, such as check AppKit version number:

  if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_3) {
    /* On a 10.3.x or earlier system, put up alert */
  }

or check for the Tiger class in question:

  if (!NSClassFromString(@"NStigeronlyclass")) {
    /* On a 10.3.x or earlier system, put up alert */
  }

If you use Tiger symbols or function calls (not methods or classes) which are not appropriately weakly linked (they aren't declared as AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER), your app might refuse to launch at all. From what you describe below this doesn't seem to be the problem though.

Ali






Begin forwarded message:

From: John Brownlow <email@hidden>
Date: April 18, 2005 10:43:56 PDT
To: Cocoa List <email@hidden>
Subject: Gracefully failing on unsupported OS version


My app is targeted at 10.4 and better. I know that whatever I do, people are going to download it and try to use it on earlier versions. I don't want to use an installer, just the drag-to- Applications thing. However, as currently configured, on pre-10.4 systems the app just fails to launch without a word of explanation. The syslog shows that the cause of the crash is "failed objc_getClass(NS**tigerOnlyClass**)"


What's the nicest way of catching this problem without using an installer? If the app won't launch in, say, 10.3, how can I tell the user very politely that they need to upgrade if they want to use my app?


-- John Brownlow Deep Fried Films, Inc

http://www.johnbrownlow.com
http://www.pinkheadedbug.com

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 >Gracefully failing on unsupported OS version (From: John Brownlow <email@hidden>)

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