Re: Can files be opened local to a "subprocedure"?

Whoa! What am I missing? I've declared files in subprocedures and they were not program-described. Maybe they __can__ be, if you can use data structures for I/O, as stated below.

Here are the requirements I found related to subprocs -

* Local files defined in subprocedures must be full-procedural files.
(F-P files are not processed with the cycle)
* Files defined in subprocedures do not have Input and Output
specifications, so all input and output must be done using data
structures.

So data-structure I/O can be used, whether program- or externally-described. Then the DS really defines the fields, right? Kind of program-described, I suppose, although not the way I've usually thought of that.

Interesting!
Vern

On 10/8/2021 8:37 PM, x y wrote:

Ah--that's the gotcha I forgot: files declared in subprocedure must be
program-defined. SQL for sure.

On Fri, Oct 8, 2021 at 5:38 PM James H. H. Lampert via RPG400-L <
rpg400-l@xxxxxxxxxxxxxxxxxx> wrote:

On 10/8/21 5:27 PM, Vern Hamberg wrote:

Now are maybe there issues of maintaining the position where you left
off in one of the files?

Of course there are. The record contents can be thrown out (the
recursion is very close to strict tail-recursion), but the position and
the EOF state can't. That is the whole point of the question, and why
opening it locally to the procedure invocation appears to be the only
way, short of caching the entire contents of the file.

And performance is not an issue. The file to be opened locally has an
absolute maximum of 55 records, and an absolute maximum of 49 records
that would satisfy the key conditions.

So far, in my tests, it appears that (at least at V6), simply moving the
F-spec to procedure level requires me to treat the file as
program-described, and define a structure to receive the record, but
treating externally-described files as program-described is old hat
around here. Apparently scatter-gather doesn't work for files declared
at procedure level?

--
JHHL
--
This is the RPG programming on IBM i (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxxxxxxxx
Before posting, please take a moment to review the archives
at https://archive.midrange.com/rpg400-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx for any subscription related
questions.

Help support midrange.com by shopping at amazon.com with our affiliate
link: https://amazon.midrange.com