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  3. March 2021

Re: File Fields In Array

Thanks to you and Barbara for the reminder - I've been replying on somewhat-fractured memory in my replices - have never needed a pointer, it just seems more complicated than it has to be.

If the DS has to have that name for TL Ashford, how about not using the externally-described DS, just put that name on the current "no-name"? This isn't all that hard, right?

OK, time to go back to working for a living!

Vern

On 3/12/2021 12:04 PM, Jon Paris wrote:
But by placing them in a DS you _have_ guaranteed that Vern.

The dangerous technique is is the one that does not define a DS but just uses an array based upon a pointer to the address of the first field. THAT IS DANGEROUS because without a DS there is no guarantee that the fields are contiguous.



On Mar 12, 2021, at 12:04 PM, Vern Hamberg <vhamberg@xxxxxxxxxxxxxxx> wrote:

There is no guarantee that fields are contiguous in the buffer - according to Jon Paris.

Try the suggestion of just using the names at the start of the DS, then the Containers array at the end, positioned at the start of the structure - another post had suggested that, right?

Vern

On 3/12/2021 10:41 AM, Henderson, Liam via RPG400-L wrote:
How about something like this:

Dcl-DS DS0 ExtName('FILE' : *Input);
Container Char(40) Dim(28) Pos(xx);
End-DS;

Where Pos(xx) is the position of the first field in the external file. I presume they're grouped together.




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-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of smith5646midrange@xxxxxxxxx
Sent: 12 March 2021 16:40
To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: File Fields In Array

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I'm very weak on totally free code (my client won't let me use it) so this might be wrong.

Don't you just need to add a CHAR(40) to your containers line?

Containers char(40) Dim(28);


-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
(WalzCraft) Jerry Forss
Sent: Friday, March 12, 2021 11:10 AM
To: rpg400-l@xxxxxxxxxxxxxxxxxx
Subject: File Fields In Array

Hi All,

I know this is a simple question but is escaping me at the moment.

I have a file that contains fields SLOTHCTR1 - SLOTHCTR28, each 40 char.

I want to have these loaded into an array because I need to change some, print label, change again, print and so on.

Changing by index would be immensely less coding then changing the field directly.

This is basically what I what it to look like.

Dcl-DS *n;
Containers Dim(28);
SlOthCtr1 Char(40) Overlay(Containers);
SlOthCtr2 Char(40) Overlay(Containers : *Next);
SlOthCtr3 Char(40) Overlay(Containers : *Next);
SlOthCtr4 Char(40) Overlay(Containers : *Next);
SlOthCtr5 Char(40) Overlay(Containers : *Next);
SlOthCtr6 Char(40) Overlay(Containers : *Next);
SlOthCtr7 Char(40) Overlay(Containers : *Next);
SlOthCtr8 Char(40) Overlay(Containers : *Next);
SlOthCtr9 Char(40) Overlay(Containers : *Next);
SlOthCtr10 Char(40) Overlay(Containers : *Next);
SlOthCtr11 Char(40) Overlay(Containers : *Next);
SlOthCtr12 Char(40) Overlay(Containers : *Next);
SlOthCtr13 Char(40) Overlay(Containers : *Next);
SlOthCtr14 Char(40) Overlay(Containers : *Next);
SlOthCtr15 Char(40) Overlay(Containers : *Next);
SlOthCtr16 Char(40) Overlay(Containers : *Next);
SlOthCtr17 Char(40) Overlay(Containers : *Next);
SlOthCtr18 Char(40) Overlay(Containers : *Next);
SlOthCtr19 Char(40) Overlay(Containers : *Next);
SlOthCtr20 Char(40) Overlay(Containers : *Next);
SlOthCtr21 Char(40) Overlay(Containers : *Next);
SlOthCtr22 Char(40) Overlay(Containers : *Next);
SlOthCtr23 Char(40) Overlay(Containers : *Next);
SlOthCtr24 Char(40) Overlay(Containers : *Next);
SlOthCtr25 Char(40) Overlay(Containers : *Next);
SlOthCtr26 Char(40) Overlay(Containers : *Next);
SlOthCtr27 Char(40) Overlay(Containers : *Next);
SlOthCtr28 Char(40) Overlay(Containers : *Next);
End-Ds;

That way I can change the fields by changing the Containers(x);

What should this look like?



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