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From: wysocki@husc9.harvard.edu (Christopher Wysocki)
Newsgroups: comp.sys.mac.programmer
Subject: Re: refNum from WD DirID?
Message-ID: <1991May16.225533.1017@husc3.harvard.edu>
Date: 17 May 91 02:55:31 GMT
References: <1991May15.125921.15058@linus.mitre.org> <1991May15.160944.19184@linus.mitre.org>
Organization: Harvard University, Cambridge, MA
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Nntp-Posting-Host: husc9.harvard.edu

In article <1991May15.160944.19184@linus.mitre.org> laf@mitre.org (Lee Fyock)
writes:

>I have a working directory dir ID and a refNum for an open file.  I'm
>trying to find out if the given file is in the given directory.  I've tried
>various incantations of PBGetWDInfo, but haven't found anything that will
>give me a way to find the directory of the open file.
>
>Any suggestions?

How about calling PBGetFCBInfo to get the directory ID, then comparing this
directory ID to that returned by PBGetWDInfo?  Something like:

Boolean FileInWorkingDirectory(short refNum, short wdRefNum)

{
    FCBPBRec    fcbpb;
    OSErr       err;
    Str63       fileName;
    WDPBRec     wdpb;

    fcbpb.ioNamePtr = (unsigned char *) fileName;
    fcbpb.ioVRefNum = 0;
    fcbpb.ioRefNum = refNum;
    fcbpb.ioFCBIndx = 0;
    err = PBGetFCBInfo(&fcbpb, FALSE);

    wdpb.ioVRefNum = wdRefNum;
    wdpb.ioWDIndex = 0;
    wdpb.ioWDProcID = 0;
    wdpb.ioWDVRefNum = 0;
    err = PBGetWDInfo(&wdpb, FALSE);

    return (fcbpb.ioFCBParID == wdpb.ioWDDirID);
}

This is off the top of my head, but I think it should work.

Chris Wysocki
wysocki@husc9.harvard.edu