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This thread belongs in RPG400-L (https://mlists.org/rpg400-l).

On Sat, Sep 21, 2019 at 7:32 PM Don Brown <DBrown@xxxxxxxxxx> wrote:

I have the following data structure;

dcl-ds ValidationFields qualified;
value varchar(50);
title varchar(50);
id varchar(10);
end-ds;

dcl-ds fields likeds(ValidationFields) dim(20);

This is just a snippet of a very large set of data structures used to
process json

If I do a data-into and the data contains for example 2 values for fields
if I try and access the 3rd element I get an error;

MSG(RNX0115) Length of varying length field variable is out of range.

ok that is correct as the length of that field would be zero.

I could code a count ...

count_fields int(10);
dcl-ds fields likeds(ValidationFields) dim(20);

Which would be set to 2 and then use that to control what array elements I
access. (While this is the best option I would like to understand the
following)

I thought I could check the length like

if %len(fields(x).id) > 0;

But this also fails with the same error which I am not yet understanding
why ?

In debug if I display fields I see all 20 occurrences of the three fields.


Do/should I initialise the data structure ? and if I do that what length
would be assigned to the varchar fields or do I need to set a minimum
length in that case ?

I am sure there is a document that explains this but so far this morning I
have not found it.

Assistance appreciated.

Thanks


Don Brown


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