Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!usc!apple!stevec
From: stevec@Apple.COM (Steve Christensen)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Is this file open?
Keywords: File Manager SFGetFile HELP
Message-ID: <9902@goofy.Apple.COM>
Date: 23 Aug 90 15:50:24 GMT
References: <1627@uvm-gen.UUCP>
Distribution: usa
Organization: Apple Computer Inc., Cupertino, CA
Lines: 29

In article <1627@uvm-gen.UUCP> root@griffin.uvm.edu (Charles Root) writes:

>Is there a way to tell if a file returned from SFGetFile is already open?

Yes, call either PBGetFInfo or PBHGetFInfo and then check out the ioFlAttrib
field.  The relevant bits in this byte are as follows:

	bit	meaning
	 2	set if the resource fork is open
	 3	set if the data fork is open
	 7	set if either fork is open

This is described in detail in Inside Mac volume 4, File Manager chapter.
If you don't want to deal with open files at all, you can do this check
in a file filter (that you pass a pointer to SFGetFile).  That way, open
files won't even show up in the list...

steve

-- 
____________________________________________________________________

  Steve Christensen             Internet:   stevec@goofy.apple.com
  Apple Computer, Inc.          AppleLink:  STEVEC
  20525 Mariani Ave, MS 81-CS   CompuServe: 76174,1712
  Cupertino, CA  95014

  "You just contradicted me."  "No I didn't."
____________________________________________________________________