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From: llama@eleazar.dartmouth.edu (Joe Francis)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Volume Name + dirID == ?
Message-ID: <1991Jun12.180730.13647@dartvax.dartmouth.edu>
Date: 12 Jun 91 18:07:30 GMT
References: <1991Jun11.195057.20315@ima.isc.com>
Sender: news@dartvax.dartmouth.edu (The News Manager)
Distribution: usa
Organization: Dartmouth College, Hanover, NH
Lines: 46

janee@ima.isc.com (Jane Eisenstein) writes:


>I've been following the discussion on how to obtain permanent file
>references.  I now know how to obtain the file's volume name and
>and directory ID.  How do I use them to open the file?  In particular,
>how do I use them to open a file on an unmounted volume whose absolute
>pathname is > 255 characters long?

OK.  The following is shortened code to do that.  I'm skipping the
part about mounting volumes (hiden in the imaginary function
"MountViewerVolume", which also return the name of the mounted
volume).  If you are trying to mount AppleShare volumes, let me
know and I can post on that subject.  This is consensed code - no
error checking, let the buyer beware:

#include <Types.h>
#include <Files.h>

void OpenFile(StringPtr fileName, long dirID)

/*open file filename in directory dirID on whatever */
/*volume MountViewerVolume mystically mounts.       */

{
 short          vRefNum,sourceRefnum = 0;
 Str255         sourceName;
 short          wdRefNum;
 HParamBlockRec pb;

 MountViewerVolume((char*)(&sourceName));         /* mount volume */
 SetVol((StringPtr)(&sourceName),0);              /* make it current */
 GetVol((StringPtr)(&sourceName),&sourceRefnum);  /* get it's vol refnum */
 OpenWD(sourceRefnum,dirID,0,&wdRefNum);          /* make working dir */

 pb.fileParam.ioCompletion  = 0L;                 /* set up param block */
 pb.fileParam.ioVRefNum     = sourceRefnum;
 pb.fileParam.ioDirID       = dirID;
 pb.fileParam.ioNamePtr     = fileName;
 pb.fileParam.ioPermssn     = fsCurPerm;
 pb.fileParam.ioMisc        = 0L;
 PBOpen(&pb,false);                               /* open file  */
}

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