RE: Convert an MI program to RPG

["Richard Jackson" <richardjackson@xxxxxxxxxxxxxxxxxx>]

Right.  You found the problem.  I thought that it was somewhere around the
mapping of types between RPG and C (I noted the requirement for nulls), I
missed the 2 byte to 4 byte issue, and was confused by the @OBJ pointer
type.

I always did this in MI so debugging via email when it is written in ILE C
and using a C function to execute an MI instruction when the data types are
not identical confused me.

Thanks for getting it right!  I learned something.

Richard Jackson
mailto:richardjackson@richardjackson.net
www.richardjacksonltd.com
Voice: 1 (303) 808-8058
Fax:   1 (303) 663-4325

-----Original Message-----
From: owner-mi400@midrange.com [mailto:owner-mi400@midrange.com]On
Behalf Of Simon Coulter
Sent: Wednesday, July 19, 2000 2:21 AM
To: MI400@midrange.com
Subject: Re: Convert an MI program to RPG


M
Hello Richard,

You wrote:
>First, can you change the declare for @OBJ to a system pointer then make
>sure that it is initialized to null before executing rslvsp function?  At
>one time, I did some real damage by not initializing my pointers first.
The
>return value is a system pointer.  The declaration showing in your message
>is for a space pointer.  They are definitely not the same thing.  In the
old
>days, the error messages for MI were pretty bad.

No.  RPG doesn't support SYPs.  See my earlier response for why this works.
I wouldn't
be doing this in RPG because there is no guarantee that the pointer
behaviour I am
exploiting will remain consistent.  This stuff should be done in MI or C.
All I wanted
to prove was that it could be done.

>I suspect that the problem is going to be found somewhere around how RPG
>maps variables and types when it calls a C function.

Actually, in this case the problem is in how Bill is mapping the values due
to not
understanding what is happening at the MI level, nor what is happening in
the C wrapper
function, and not really what is happening in the RPG example.  Hopefully my
earlier
appends will clarify that.  There are only so many ways I can say the same
thing.

Regards,
Simon Coulter.

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