Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!dino!ux1.cso.uiuc.edu!tank!gft_robert@gsbacd.uchicago.edu
From: gft_robert@gsbacd.uchicago.edu
Newsgroups: comp.sys.mac.programmer
Subject: PBHGetVInfo returns noErr but volRefNum=-1
Message-ID: <9166@tank.uchicago.edu>
Date: 7 May 90 22:03:36 GMT
Sender: news@tank.uchicago.edu
Organization: University of Chicago Graduate School of Business
Lines: 30

Well, I have for the first time delved into the PB calls, and am having some
problems.  At one point in my program I'm trying to convert a volume name to a
vol ref num and I do the following:
        
    volName := concat(volName, ':');
    paramBlock := HParmBlkPtr(NewPtr(SIZEOF(HParamBlockRec)));
    if paramBlock <> nil then
     begin
      paramBlock^.ioCompletion := nil;
      paramBlock^.ioNamePtr := @volName;
      paramBlock^.ioVRefNum := 0;
      paramBlock^.ioVolIndex := -1;
      theOSErr := PBHGetVInfo(paramBLock, FALSE);

      etc.

I get noErr (0) for theOSErr, but ioVRefNum comes back as -1.  What am I doing
wrong?  

Any info much appreciated! (BTW, is there a clearer exposition of the PB calls
in general than in IM IV?  I've re-read it a couple of times, and though it's
well-written, it could be a bit more explicit at times.)

Robert

============================================================================
= gft_robert@gsbacd.uchicago.edu * generic disclaimer: * "It's more fun to =
=            		         * all my opinions are *  compute"         =
=                                * mine                *  -Kraftwerk       =
============================================================================