Xref: utzoo comp.sys.mac.hypercard:1561 comp.sys.mac:27120
Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!cornell!biar!trebor
From: trebor@biar.UUCP (Robert J Woodhead)
Newsgroups: comp.sys.mac.hypercard,comp.sys.mac
Subject: Re: Launching applications from HyperCard
Keywords: Floppy only
Message-ID: <142@biar.UUCP>
Date: 22 Feb 89 05:06:52 GMT
References: <1600@ucqais.uc.edu>
Reply-To: trebor@biar.UUCP (Robert J Woodhead)
Followup-To: comp.sys.mac.hypercard
Organization: Biar Games, Inc.
Lines: 18

In article <1600@ucqais.uc.edu> rainwatr@ucqais.uc.edu (Donald J. Rainwater) writes:
>	After all this introductory information, my question is this.  Is
>there a way to limit the capabilities of the file dialog box?

You will have to use an XCMD that lets you put up a custom SFGetFile dialog.
In it you will define a custom fileFilter proceedure (see IM I-517 for
info on the standard file package).  This procedure will vote "yea" or "nay"
on any particular file.  The filefilter is pased a pointer to a parameter
block that contains the contents of a GetFileInfo call on the file.  Call
this pointer Info.  Info^.ioVRefnum contains the volume reference number
of this file.  Use that to call PBHGetVolInfo.  the ioVDRefNum field contains
the driver number of the volume (see IM IV-123,124).  If this is -5, it is
the ".SONY" floppy disk driver [WARNING:I don't know if the new high density
floppies use the same driver].  So you return TRUE if ioVDRefNum=-5, and
FALSE otherwise.

This means your user can click the drive button all he wants, but will never
see any applications on non-floppy drives!