RE: Dynamic 'callp'

["Wilt, Charles" <WiltC@xxxxxxxxxx>]

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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