RE: Dynamic 'callp'

Callp is of course the "Call a Prototyped Procedure or Program" op-code, so Ewart is already using
prototypes.

Since he's dealing with external programs, he doesn't need to (nor can he?) use procedure pointers.

As Brian points out, external program calls are always dynamic.


HTH,
Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of David Gibbs
Sent: Tuesday, August 07, 2007 7:35 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: Dynamic 'callp'

Although I haven't used this technique myself ... I know it's
possible.

Instead of a callp, you need to do a prototyped call ... and
use procedure pointers.

Basically, you establish the addresses of similarly
prototyped procedures, and then the procedure you call is
defined with a pointer as it's 'extproc'. See
http://wiki.midrange.com/index.php/Procedure_Pointers for
some information.

david

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