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Thanks to everyone who replied. I'm not going crazy after all.
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Jon Paris
Sent: Wednesday, January 27, 2010 2:31 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: *NOPASS parameter retaining old value
On Jan 27, 2010, at 12:31 PM, rpg400-l-request@xxxxxxxxxxxx wrote:
The code works fine. What I don't understand is why ForceRead has a
value. When I run in debug I would expect the evaluation of the
ForceRead parameter to not be addressable because it wasn't passed.
Instead it contains the value from an earlier call that did pass the
parameter. Is it that once the parameter is passed the procedure
retains that address in memory and therefore the value of that
parameter?
The fact that you saw your old data was basically a matter of luck and timing. It could have been a pointer to any old parm previously passed by a call with that many parms (or more). Luckily for you you were defending correctly (i.e. checking %parms) and not attempting to update the parameter. I've seen some really nasty DB corruption caused by folks who used and updated more parameters than they received - assuming that it would blow up if the parm wasn't passed. Really bad assumption.
This thread
http://archive.midrange.com/rpg400-l//200301/msg00210.html
dealt with the topic. I've also written on it including sample code to demonstrate what's going on under the hood, but I can't find the reference right now.
Jon Paris
www.Partner400.com
www.SystemiDeveloper.com
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