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From: jtn@ADS.COM (John T. Nelson)
Newsgroups: comp.sys.mac.programmer
Subject: Problems with PBGetCat and other related things (LONG)
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Date: 3 Mar 91 19:35:49 GMT
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Organization: Advanced Decision Systems, Mtn. View, CA (415) 960-7300
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Grak!  I'm having problems with PBGetCat and PBGetFInfo.  I suspect
the problem is because I am not positioned in the correct directory
but it's difficult to tell where the problem is.  I have a subroutine
called directoryP() which tries to test for a directory in the current
working directory which I previously set using SetVol() in my function
GoToDirectory().

Here's the problem.  A call to PBGetFInfo ALWAYS returns -43 which is
fnfErr in Mac error results lore.  The folder/file I test for is
located by SFPGetFile although it is in the same directory that the
program is run from.  I also have an identical folder located at the
root-most directory (because I suspected my working directory wasn't
really where I thought it was) and yet it still fails.

I set my directories by getting the (long) directory ID of the
directory in which to search and then using PBopenWD to get a refNum I
can then use with SetVol.  Now the funny thing here is that I'm
emulating the code that is used in the Unshar utility recently
distributed on the net. This utility passes a (long) into SetVol which
I think is wrong.  SetVol takes an int... not a long.

The long dirID passed into GoToDirectory() is derived from the global
CurDirSave after doing an SFPGetFile.  Here's the code fragment that
does that:

	if (reply.good) {
		dirVRefNum = reply.vRefNum;
		if (useCurDir) {
			dirDirID = CurDirStore;
		}
		else {
			dirDirID = (long)(reply.fType);
		}
	}
	return(dirDirID);

GoToDirectory(long dirID)
{
long	dID;
/* short dID; */
/* int dID */
	
	wdpb.ioCompletion = NIL;
	wdpb.ioNamePtr = NIL;
	wdpb.ioVRefNum = dirVRefNum;
	wdpb.ioWDDirID = dirID;
	if (PBOpenWD(&wdpb, FALSE) != noErr) {
		return;
	}
	
	dID = dirVRefNum = wdpb.ioVRefNum;
	(void)SetVol(NIL, dID);
}

Boolean directoryP(Str255 file) {
Str255			vName;
int			vRefNum;
CInfoPBRec		cBlock;
OSErr			err;

cBlock.dirInfo.ioCompletion = NIL;
cBlock.dirInfo.ioNamePtr = file;

GetVol(&vName, &vRefNum);

/*cBlock.dirInfo.ioVRefNum = - ( *(short *) SFSaveDisk );*/
cBlock.dirInfo.ioVRefNum = vRefNum;
cBlock.dirInfo.ioFDirIndex = 0;

err = PBGetFInfo(&cBlock, SYNCHRONOUS);
if ( err == fnfErr )
	return FALSE;

if ( cBlock.dirInfo.ioFlAttrib & 0x010 )
	return TRUE;
else
	return FALSE;
}


Any ideas on what I'm doing wrong?



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