RE: Defining DS to retrieve variable length data from API

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Rory Hewitt
Sent: Tuesday, June 26, 2007 5:33 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Defining DS to retrieve variable length data from API

<snip>

Second, if you're going to use a template structure and then
refer to another LIKEDS structure in your program, then you
should base the template structure on a dummy pointer,
otherwise you're simply defining two structures (both of
which take up memory). In fact, in my example above, I didn't
define a separate based-on-dummy template - I simply use the
RCVM0100 structure in my program - it's not (in my opinion)
significantly less readable to refer to RCVM0100.MsgID than
it is to refer to MsgInfo.MsgID.
Again, just a style thing. Although the likes of Bob Cozzi
and Scott Klement would probably chastize me for it, I *very*
rarely use template structures and LIKEDS, unless there are
likely to be multiple copies of the same structure in the
same procedure (or module) which need to be used at the same time.

<snip>

I always use BASED(TEMPLATE) template structures, but one reason is that I'll
have that big old 32K
field defined in the template structure and my actual structure will be based
on dynamically allocated
memory that is the exact size required for that particular call.



Charles





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