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  1.  Home
  2. RPG400-L
  3. January 2014

Re: overlaying arrays in v5r1

Thanks, everyone.

Since I needed to use the externally described data structure, which brings in the original fields as subfields, I could not create separate data structures to name the subfields again and have them overlaid (which I would LIKE to do
to avoid the overlay(field:startpos) format of the overlay keyword). So, I did use the StartPos format. Fortunately, the file this is based on is mature and won't be changing.

Thanks for the advice.

Tom Garvey

On 1/20/2014 2:41 PM, Jon Paris wrote:
But Alan didn't use LIKEREC or anything Paul so it doesn't matter. His technique (which is what I would have used) simply forces the compiler to allocate the storage for the fields in question in the named DS. Once there they can be redefined as an array. This article from 2003 outlines the technique and was written in response to almost exactly the same question as the OP posed. http://www.ibmsystemsmag.com/ibmi/developer/general/D-spec-Discoveries/

If there are any other fields in the record that are wanted their storage will simply be automatically allocated as per normal.
On 2014-01-20, at 2:02 PM, paultherrien@xxxxxxxxxxxxxxxxxx wrote:

I agree with you on that, but my assumption was that the fields in question
might not be the only fields in the record format.

Paul

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Alan Campin
Sent: Monday, January 20, 2014 2:00 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: Re: overlaying arrays in v5r1

Assuming CTTA fields are coming from a file you do not need the field sizes,
only the names. The compiler will define them based on the previous
declaration of the file.

d OverCTTA ds
d CTTA01
d CTTA02
d ...
d CTTA10
d CTTAArray...
d 17s 4 Dim(10)
d Overlay OverCTTA)



On Mon, Jan 20, 2014 at 11:22 AM, <paultherrien@xxxxxxxxxxxxxxxxxx> wrote:

CTTA01 Decimal 17 4
CTTA02 Decimal 17 4
CTTA03 Decimal 17 4
...
CTTA10 Decimal 17 4

CTTALL 1 170A
CTTA OVRLAY(CTTALL) LIKE(CTTA01) DIM(10)

Define a single field to overlay the entire set of fields.
Define your array over that field.
My example assumes that CTTA01 etal are zoned. If packed, then CTTALL
length would be 90a.


Paul

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Thomas Garvey
Sent: Monday, January 20, 2014 12:57 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: overlaying arrays in v5r1

I'm drawing a blank on how to define an array over several fields in a
file record.

The file has several fields defined as...

CTTA01 Decimal 17 4
CTTA02 Decimal 17 4
CTTA03 Decimal 17 4
etc..

I THOUGHT I could just define the file on an external DS definition,
as follows...
D FileDS E DS extname(FileName)

Then, just add the array definitions using the overlay keyword, as
follows...
D CTTA overlay(CTTA01) dim(10)
like(CTTA01)


Remembering that this is on a v5r1 system, the compiler rejects it,
saying, RNF7303 Subfield defined with keyword OVERLAY is too big;
specification ignored.

How are ten elements of packed 17/4 too big for a subfield?

How must I specify this?
--

Pressing on,

Thomas Garvey



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Jon Paris

www.partner400.com
www.SystemiDeveloper.com






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