Re: Exception vs function-check; ILE vs OPM

["Peter Dow" <pcdow@xxxxxxxxx>]

Hi David,

I've never used an error handler, so if you mean calls within the vendors
menu program to CEEHDLR or CEEHDLU, no, there are not.

Peter

----- Original Message -----
From: David Morris <dmorris@plumcreek.com>
To: <RPG400-L@midrange.com>
Sent: Thursday, January 06, 2000 2:58 PM
Subject: Re: Exception vs function-check; ILE vs OPM


> Peter,
>
> I would look to see if they are registering an error handler.
> I have not used an indicator on a call to QCMDEXC, so I am
> not certain, but it seems as though it should be set on.  Look
> for calls to CEEHDLR or CEEHDLU.
>
> David Morris
>
> >>> pcdow@yahoo.com 01/06/00 12:27PM >>>
> Hi Everyone,
>
> I posted this to Midrange-L and got no response, possibly because it was
> accidentally in HTML format, for which I apologize. Hopefully someone on
> this list can give me some insight.
>
> I'm getting a little confused from RTM re exception vs function check and
> how error handling occurs when mixing OPM and ILE RPG programs. A
particular
> vendor's menu program was originally written in RPG, and was recently
> converted to ILE RPG. It allows the user to enter commands using either
> native syntax or Sys/38 syntax. When executing a menu option, the way they
> determine which is which is to assume it is AS/400 syntax and call QCMDEXC
> passing the command, with an indicator on the CALL. If it fails, they try
> again with QCAEXEC. If that fails, the user is notified.
>
> With ILE RPG, this method fails. The particular menu option in question
> happened to be a CHGDTA command. Yes, DFU. Even better (<G>) it was a
Sys38
> DFU. So the initial call to QCMDEXC shows an *ESCAPE message in the job
log
> from CHGDTA saying the DFU program specified is not a DFU program
> (understandable), but then returns without setting on the error indicator,
> so no call to QCAEXEC is ever made.
>
> Compiling the menu program in ACTGRP(*CALLER) or DFTACTGRP(*YES) makes no
> difference.
>
> After reading and re-reading the manual, it seems to get down to the
> difference between an exception (a *ESCAPE, *NOTIFY or *STATUS message
sent
> to the call stack entry as the result of a runtime error) and a function
> check (an exception message that is not handled by any call stack entry
back
> to a control boundary or OPM). Both QCMDEXC and QDZCMDP (the CPP for
CHGDTA)
> are OPM programs.
>
> Based on all that, it appears either QDZCMDP or QCMDEXC somehow "handled"
> the exception message so that it does not become a function check. So
> finally, my question is, what does "handling" the message consist of? And
is
> there anyway to change this behavior to mimic the OPM behavior without
> modifying the menu program?
>
> TIA
>
> Peter Dow
> Dow Software Services, Inc.
> 909 425-0194 voice
> 909 425-0196 fax
>
>
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