RE: Passing pointers as parms

[Mark Drazic <Mark.Drazic@xxxxxxxxxxxx>]

In my testing, RPG is NOT very forgiving about passing pointers outside the
program object- it does not seem to allow this at all.  There is mention of
it in the manuals somewhere, where memory can only be shared by modules of
the same program.  You will especially have problems if the programs exists
in different Activation Groups.

If your buffer is a set of repeating elements, and I'm not sure that it is,
your best bet will be to have the called program return a single element at
a time to the calling program.  You can use a pointer in the called program
to "sift" through the data buffer, and can even create contiguous dynamic
memory instead of using a single, large static buffer.  This will "hide" any
pointer logic to the calling program, making it easier to use, and in my
testing, is extremely and suprisingly fast.

> ----------
> From:         jfinney@omnia.co.za[SMTP:jfinney@omnia.co.za]
> Reply To:     RPG400-L@midrange.com
> Sent:         Tuesday, November 28, 2000 8:12 AM
> To:   rpg400-l@midrange.com
> Subject:      Passing pointers as parms
> 
> 
> Hi all,
> 
> I've a program which moves a buffer, (anywhere up to 32767), into a data
> structure. The data appears correct in the subfields.
> 
> What I want to do is to call another program and instead of passing the
> data/data structure, rather pass a pointer to the data and move the data
> into a
> data structure in the called program. Any suggestions, (yes, I'm busy
> reading
> the manual) ?
> 
> Regards
> John.
> 
> 
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