Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!purdue!bu-cs!mirror!francis
From: francis@mirror.UUCP (Joe Francis)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Parameter blocks (yech!)
Message-ID: <32896@mirror.UUCP>
Date: 14 Nov 89 23:13:39 GMT
Organization: Mirror Systems.  Cambridge, Mass.
Lines: 23

In article <9730@zodiac.ADS.COM> jtn@zodiac.ADS.COM (John Nelson) writes:
(some stuff deleted)
>Specifically when I declare my parameter block pointer to be of type
>parmBlkPtr, the LSC compiler complains that ioCompletion is not a
>valid union or member.  If I declare my parameter block pointer to be
>of type fileParam, the element namePtr is suddenly not defined.
>
>Now on page 117 we see that yes indeed these elements are not defined
>when you use these respective pointers... BUT there must be some way
>to access both of these elements via the same parameter block pointer!
>In fact this is what the documentation implies... that the first 8
>elements are included in all structures and varients of the structures.
>
In FileMgr.h *ParmBlkRec and ParamBlockRec are defined together as a
union of the structs ioParam, fileParam, and volumeParam.  So instead of
	ParmBlkPtr	pbPtr;

	...
	pbPtr->ioCompletion = 0L;
you need:
	pbPtr->fileParam.ioCompletion = 0L;
for example.
	I hope that helps!