Newsgroups: comp.os.os2.programmer
Path: utzoo!utgpu!watserv1!watmath!mks.com!dale
From: dale@mks.com (Dale Gass)
Subject: Dectection of HPFS File system?
Organization: Mortice Kern Systems Inc., Waterloo, Ontario, CANADA
Date: Thu, 15 Nov 90 17:49:07 GMT
Message-ID: <1990Nov15.174907.19980@mks.com>

I require a portable and efficient method of determining whether a given
drive uses the HPFS file system.

OS/2 1.2 provides such a call, DosQFSAttach, which returns the relevant
information about a drive.

However, this call is not supported under OS/2 1.1 (and I want the
program to remain 1.1 compatible).  Since HPFS was non-existent under
OS/2 1.1, I can easily avoid making this DosQFSAttach call after
checking the version number and finding it to be less than 1.2.
However, since the DOS calls are dynamically linked, the mere external
reference to DosQFAttach in the executable causes the program execution
to fail at load time.

What I require, is a portable way (i.e.  works on OS/2 1.1, 1.2) to
determine whether a drive is a HPFS file system, without using calls
that are unsupported in version 1.1.

One potential solution would be to create a dynamically linked library
(.DLL) to be included if the user is using OS/2 1.1.  This DLL would
contain a stub for DosQFSAttach which would always return values
indicating FAT file systems.  This is not the cleanest solution, as it
requires an extra auxilliary support file.  A less externally visible
solution would be preferred.

Any comments, suggestions, insights, would be greatly appreciated.

-dale

dale@mks.com    uunet!watmath!mks!dale