RE: Sharing Global Variables between Modules

Steve

I think I see better now - heh!

Using pointers is not recommended - I don't have the exact details, but there were some threads on that here not too long ago.

As long as you do NOT say VALUE on the PI or PR, you are passing the DS by reference, and a change you make is known to the caller. This is because you are already using a pointer.

I think!

Vern

-------------- Original message --------------
From: "Coyle, Stephen F." <SCoyle@xxxxxxxxxxxxx>

I've never used the IMPORT/EXPORT on a DS before as I've heard bad
things about "hidden" interfaces.

Let me clarify the requirement...

One of the modules is the VIEW and it contains my DSPF.
The other module is the CONTROLLER.
Both modules declare the DS globally using a third part ERP /copy.
The DS in question is loaded in the view when it is initialized.
The controller needs access to the data in the loaded DS and may also
modify the DS content.
If the DS is modified in either module, the other module needs to know
this.

The problem I had was I would pass the global DS from the caller to the
callee. The callee would treat the passed parm as a local variable
(defined on the PI) instead of accessing it's global variable of the
same name.

I ended up moving copies of the DS around but thought pointers might be
a simpler solution.

Not sure if that is any clearer....

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Wilt, Charles
Sent: Friday, June 20, 2008 3:49 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Sharing Global Variables between Modules

They could be....

If one module has the DS specified with EXPORT and the other has the DS
specified with IMPORT.

But, generally speaking that's a bad idea that you should stay away from
if at all possible.

I'm afraid I don't quite understand what you have vs. what you are
asking for.

Each module has the DS, correct?

It currently isn't shared between modules?

Now you need it to be?

The question is why do you think you need this?

Eric is probably on the right track, take the DS out of the modules and
encapsulate it in its own
module along with appropriate accessor procedures. Now modify the
existing modules to use the
procedures from the new one.

However, I have to say, I'd be a little concerned. Depending on the
accessor functions you provide
for the DS data, this method may not be any better than just using
IMPORT/EXPORT to share the DS.

HTH,

Charles Wilt
--
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx

[mailto:rpg400-l-bounces@xxxxxxxxxxxx]

On Behalf Of Coyle, Stephen F.
Sent: Friday, June 20, 2008 3:21 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Sharing Global Variables between Modules


Vern,
I understand I would not have to pass a global variable to
procedures contained in the same module.
These are calls between procedures in different modules. The
variable is declared in both modules as global.

These are not shared when both modules are bound into a
program...Correct?

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