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From: oster@well.sf.ca.us (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Menu Mangler & ThC 4.0 Nightmare
Message-ID: <22214@well.sf.ca.us>
Date: 17 Dec 90 07:35:10 GMT
References: <1990Dec16.034906.25332@cunixf.cc.columbia.edu> <8640@dog.ee.lbl.gov>
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 38

The menu manager reads the menu resource into memory, then modifies it.
If the resoure is purged, the reread, these necessary modifications will
not have been done on the new copy, and your program will crash. What
you can do is, preserve the state of the menu, when it is good, in another
handle, then reset it later.  I use a routine like BlockMove, that
makes one handle match another. here it is:
/* HandleMove - copy all the data from src to dest.
 */
OSErr HandleMove(src, dest)Handle src, dest;{
	LongInt len;
	OSErr	val;

#if STRICT
	if(NIL == src || NIL == dest){
		DebugStr((StringPtr) "\pCan't happen in HandleMove");
	}
#endif
	val = noErr;
	if(NIL == dest){
		return noErr;
	}
	if(NIL == src){
		SetHandleSize(dest, 0);
		return MemError();
	}
	len = GetHandleSize(src);
	if(len != GetHandleSize(dest)){
		SetHandleSize(dest, len);
		if(noErr != (val = MemError())){
			return val;
		}
	}
	BlockMove(*src, *dest, len);
	return noErr;
}
-- 
-- David Phillip Oster - At least the government doesn't make death worse.
-- oster@well.sf.ca.us = {backbone}!well!oster