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From: science@oasys.dt.navy.mil (Zimmermann)
Newsgroups: comp.sys.mac.hypercard
Subject: FSOpen() XFCN query
Message-ID: <8474@oasys.dt.navy.mil>
Date: 16 Jun 91 20:19:15 GMT
Sender: news@oasys.dt.navy.mil
Organization: David Taylor Research Center, Bethesda, Md.
Lines: 34


  Help!  I need to open a named file from within a HyperCard XFCN
(written by me in Think C, running under System 7.0 in HyperCard 2.1),
WITHOUT going through a Standard Files Dialog ... can somebody show me
an example of a Think C code fragment to do so?  Maybe this is trivial
(I hope so!), but I can't get it to work without calling SFGetFile()
first to get a vRefNum and file name (unless the named file is in the
same directory as HyperCard itself -- see below).  What am I doing
wrong?
  Specifically, I seem to be having trouble with getting the vRefNum
to work right ... I had thought (naively?) that I could use 0 for a
vRefNum and provide a file name, and the file would be opened if it
was in the same directory as the current HC stack (which I assumed
would be the default volume) ... that clearly doesn't work.  I tried
calling GetVol() with NULL for volName, and that gives me back a
vRefNum which seems to correspond to the directory in which HyperCard
itself lives (which makes sense, since HC is running the stack which
my XFCN is executing from).  So, I can open my named file with
FSOpen() when it is in the same directory as HyperCard, not a good
solution.  My attempts to provide a colon-delimited path as part of
the fileName given to FSOpen() also have failed.
  So, any advice?  My ultimate goal is to simply find out the vRefNum
for the directory in which my stack is stored, and to open a named
file in that very directory.  Would it work to ask HyperCard to
provide me with "the long name of this stack" and then to edit that
into shape?  But what about the vRefNum that I need to provide
FSOpen()??
  Tnx for any advice or pointers to relevant info or sample code! ...
^z (Mark Zimmermann, "science@oasys.dt.navy.mil", "zimmermann" on
AppleLink)

P.S.  I am still looking for examples/advice re interapplication
communication between HC2.1 stacks and UNIX-like Think C programs ...
has anybody actually *done* this yet?  tnx -- ^z^z