Re: QMHSNDPM API (Sending an Escape Message)

[Simon Coulter <shc@xxxxxxxxxxxxxxxxx>]

On 30/05/2008, at 4:56 AM, Zachary Johnson wrote:

> I can't find exactly what I'm looking for in the archives and I'm done
> with trial and error so here's the question. I am writing a message
> handling service program using QMHSNDPM.  What I want to happen is to
> collapse the call stack back to the last PEP.  I can't seem to get the
> parameters right to accomplish this.  All the RPG's run out of the
> default activation group so *CTLBDY doesn't seem to work,

If you're using ILE then you REALLY need to fix that but that's a  
separate issue.

> *PGMBDY
> doesn't work because it's a service program I guess.

When using QMHSNDPM in a service program the *PGMBDY is the call  
stack entry for the first procedure invoked in the service program-- 
not terribly useful in my experience.

> Anyway I've tried
> just about everything with the parameters. So my next step is going to
> be to use the API to get the call stack info so I can use that to find
> the last PEP, but I thought surely there must be a way and I'm just
> missing something.

I think you'll find this utility much more usable if you let your  
caller decide where to send the message. Have them pass in the call  
stack entry and relative counter. Make these optional parameters and  
use sensible defaults (like * and 1). Your caller can then pass the  
PEP entry derived from _QRNP_PEP_ plus the program name in the PSDS  
(presuming RPG IV). Similar can be done for COBOL (_Qln_pep), CL  
(_CL_PEP), C (_C_pep). You could simplify this process by having your  
caller pass in their own program name and then use *PGMNAME for the  
call stack entry.

If you still want to derive the PEP then you could accomplish that  
using the QMHSNDPM and QMHRCVPM APIs to determine your caller's  
program name, or you could use QWVRCSTK to interrogate the call  
stack. Specify the program name in the Call stack entry qualification  
parameter and *PGMNAME for the Call stack entry itself.

Regards,
Simon Coulter.
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