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From: engber@ils.nwu.edu (Mike Engber)
Newsgroups: comp.sys.mac.programmer
Subject: Follow Up: on files not showing up in SFGetFile
Summary: seems version number related
Message-ID: <1488@anaxagoras.ils.nwu.edu>
Date: 24 Apr 91 23:35:16 GMT
Organization: The Institute for the Learning Sciences
Lines: 40

In my previous posting I described a problem involving creating files
that showed up in the Finder, but not in SFGetFile dialogs.
ephraim@Think.COM suggested that the problem could be non-zero version
numbers.

I was creating the files using PBHCreate. PBHCreate does not list
ioFVersNum as an input parameter so I was leaving it uninitialized in
the HParamBlock.  Furthermore, PBGetFInfo showed the version number of
the file to be zero.

So, it would seem that a non-zero version number is not the problem.
But, if I specify initialize ioFVersNum to zero in the HParamBlock I
pass to PBHCreate, the problem doesn't occur.

This raises questions:

- Does PBHCreate use the ioFVersNum field of the HParamBlock?
  i.e. is IM IV p. 146 missing -> ioFVersNum

- Why did PBGetFInfo return zero for version number - did it bother to
  read the info off disk or did it assume it to be zero since it was on
  an HFS volume?

- Is specifying 0 for ioFVersNum to PBHCreate a reliable way to
  get file with version numbers of zero or should I explicity set
  them to zero.

- To set the version number of a file to zero it seems like I'd need to
  use PBSetFInfo, the non-HFS call, since it lists ioVVerNum as an input
  parameter and PBHSetFInfo doesn't. Or perhaps PBHSetFInfo suffers from
  the same problem as PBHCreate and really uses ioFVersNum.

- If someone could just tell me of a reliable way to check version
  numbers of files I could empirically answer these questions.

Please respond via email if possible. I'll post another summary if I
get a handle on what's going on. (seems like there should be a relevant
tech note somewhere)

-ME