Path: utzoo!yunexus!geac!geaclib!rae
From: rae@geaclib.UUCP (Reid Ellis)
Newsgroups: comp.sys.mac.programmer
Subject: Re: SAMPLE cdev in C
Keywords: cdev, getresource, packages in rom
Message-ID: <3646@geaclib.UUCP>
Date: 6 Feb 89 10:41:46 GMT
Article-I.D.: geaclib.3646
References: <1845@helios.ee.lbl.gov>
Reply-To: rae@geaclib.UUCP (Reid Ellis)
Organization: T'nir Software
Lines: 29

osborn@ux1.lbl.gov (James R Osborn) writes:
|	I have been attempting to do the SAMPLE cdev given in IM-V p.323
|using LSC 3.01p3.  I was simply trying to do a direct translation from the
|example in Pascal to C.  When I try to run the damn thing (in the control
|panel), the ICN# shows up properly and I can select it.  Sometime soon
|after it has drawn in the gray background and the specified nrct, it crashes

I, too was bitten with this.  The problem is that the example, as written,
will not work with newer ROMs.  To determine if there is sufficient RAM
available, it calls GetResource to load a PACK [or is it PKGE?] resource.
With the new ROM, this package is in ROM and thus the call to GetResource
returns NULL [the resource isn't in any open file, after all].  To fix
this, either change the call to NGetResource [I think that's what it's
called -- I don't have IM V handy, sorry] which checks ROM resources as
well, or else re-write the code entirely and just check for enough free
memory for the cdev.

I wrote a cdev that used this same GetResource thing and got bitten
when the new ROMs came out.  Alas, I lost the source [at least I couldn't
find it last time I checked] so it is lost forever.  It just diddled with
intl0 and intl1 resources, along the lines of "Simon" [but it let you
change the short date separator too -- I don't like "/"].

				Hope this helps,
					Reid

"Will Vooper and Honest Crocus obliterate Ylum in a
 vicious arms race?  Let's all stay up late worrying
 about it!"