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From: ba0k+@andrew.cmu.edu (Brian Patrick Arnold)
Newsgroups: comp.sys.mac.programmer,comp.sys.mac.hypercard
Subject: BlessedFolder() XFCN?
Message-ID: <8Z_X3Om00UzxM1T0lV@andrew.cmu.edu>
Date: 4 Oct 89 16:33:30 GMT
Organization: Mechanical Engineering, Carnegie Mellon, Pittsburgh, PA
Lines: 32


Hello there,

    does anybody know about an XFCN that will return the path name of
the blessed system folder?  I am writing a file-based interapplication
communications (IAC) between an application "Demos" and a HyperCard
stack.  The IAC is presently achieved from the working directory, but
I'd like for it to be able to deal with shared, locked volumes, e.g.,
eventually run via an AppleShare server.  So I want to work through the
blessed folder.  The application "Demos" has already been modified to
use the MacApp gConfiguration.sysVRefNum which was obtained through
SysEnvirons.  What I now need is for my HyperCard stack to do a similar
thing so they can "talk" again.

    Pieces to the solution of this simple puzzle must include
SysEnvirons() for the blessed folder vRefNum and File manager calls to
milk the vRefNum into a file path name, which HyperCard enjoys better
than vRefNums (snarl).  Has anyone already done this?  If I try it, I
want to ask 3 things: (1) does my approach sound correct, (2) I've never
milked vRefNums before so can anybody give me tips, and (3) is anyone
else interested in such an XFCN if I do it right?

BTW: Whenever I use the blessed folder in "Demos" to create and destory
temporary files, I seem to need to also use the following for it to
work: 

GetVol(saveVol)/SetVol(sysVol)/...(my_stuff).../SetVol(saveVol)

for file writing or deletion to work.  Am I doing something wrong or do
I really need to call these?

- Brian