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From: andyp@gvgpvd.GVG.TEK.COM (Andy Peterman)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Is multifinder or finder running??
Message-ID: <1451@gvgpvd.GVG.TEK.COM>
Date: 12 Dec 89 05:28:11 GMT
Reply-To: andyp@gvgpvd.GVG.TEK.COM (Andy Peterman)
Organization: Grass Valley Group, Inc.; PVD
Lines: 20

ARGH!!!!   I can't stand it anymore.  Here's method of determining if
MultiFinder is running (in C):

        WindowPtr deskTop;      /* usable if mfActive is false */
        Boolean mfActive;       /* true if MultiFinder is running */

        GetWMgrPort (&deskTop);
        mfActive = (PtrZone ((Ptr)deskTop) == GetZone());

As long as the the call GetWMgrPort works (which Apple has said not to
use because "its going away") this will determine if MultiFinder is
active.  It uses the assumption that if the Window Manager's Port is in
your heap, then MultiFinder must not be running (since when it is
running, it has control of it).  This has worked for me since long
before MultiFinder was released and has not presented any problems yet.
It may even continue to work under System 7.0 (which is always
MultiFinder) if the GetWMgrPort continues to work. 

Andy Peterman
andyp@gvgpvd.gvg.tek.com