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  3. February 2014

Re: CONST parameter changed?

Maybe suggest DSPPGMREF to "people who want to look at the top of a program"

-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of Anderson, Kurt
Sent: Friday, February 21, 2014 7:45 AM
To: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Subject: Re: [WDSCI-L] CONST parameter changed?

I've been in the habit of always performing file I/O through local data structures. I also Qualify all files which prevents the file's fields from being defined globally.

I'm a huge fan of qualifying. Some people may not like it because there is extra "typing." (Not so much when you use autocomplete.)

As Darren said, you can also define files locally. I've done that a few times. The main complaint I get when I do that is from people who want to look at the top of a program to see what files it uses. The compromise was to also add a comment in the F-specs to list all the files defined locally.

-Kurt

-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of darren@xxxxxxxxx
Sent: Friday, February 21, 2014 7:54 AM
To: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Subject: Re: [WDSCI-L] CONST parameter changed?

You can define files locally, which I did in a couple programs as a test.
The file was a display file, and it complicated the program more than it benefitted it. It was a display file, which I think might be worse than a disk file for the way you have to define the record formats in different ways.




From: "Colpaert, Peter" <Peter.Colpaert@xxxxxxxxxxx>
To: Rational Developer for IBM i / Websphere Development Studio
Client for System i & iSeries <wdsci-l@xxxxxxxxxxxx>
Date: 02/21/2014 12:44 AM
Subject: Re: [WDSCI-L] CONST parameter changed?
Sent by: wdsci-l-bounces@xxxxxxxxxxxx



First of all, my sincere apologies for posting to the wrong forum. It was a rough day yesterday ;-)

Kurt,

The global variable is a field of a file I'm updating, so I don't see any other way to define it.

I solved the issue by copying atrval20 to a work variable and using that when calling WriteAttribute.

Now it works like a charm.

Yay, I learned something new today...

Met vriendelijke groeten / Best regards,

Peter Colpaert
Software Engineer - PLM Development Team IT Operations Cluster Benelux, Philips IT

Philips Consumer Luminaires
Industrieterrein Satenrozen 11, 2550 Kontich, Belgium
Tel: (+32) 3/459 13 17
Email: Peter.Colpaert@xxxxxxxxxxx

Working from home on Wednesdays

-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of Anderson, Kurt
Sent: donderdag 20 februari 2014 14:49
To: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Subject: Re: [WDSCI-L] CONST parameter changed?

Const prevents the procedure from changing the value directly. But it's
not saying you can't change the global variable that was passed into the procedure.

As Darren said, passing a value by Const means that it's passing a pointer.
So atrval_p isn't really changing at all. It's still pointing to the same spot in memory, it's just that you've changed what's in memory by changing a global variable.

Quick fix: use Value instead. I groan as I recommend that. Just be aware of the properties of Const and Value and you should be fine. (FYI: Value will pass the parameter as the data value, not as a pointer.)

Longer fix: get away from what you're doing with setting global variables from a procedure the best you can. Otherwise you may run into that issue again somewhere else (or not even realize you did it and cause a problem in production code).

-Kurt

-----Original Message-----
From: wdsci-l-bounces@xxxxxxxxxxxx [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of darren@xxxxxxxxx
Sent: Thursday, February 20, 2014 8:21 AM
To: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Subject: Re: [WDSCI-L] CONST parameter changed?

You might get better response in the RPG list. This list is more for RDi discussions.

I will say that atrval20 is probably defined as a global static variable in your program. It is then passed by reference using a pointer to WriteAttribute. Then you are resetting the global variable, which subprocedures have access to. I would say that this has always been possible, although CONST doesn't always pass the variable as a reference, so the behavior might seem sporadic.




From: "Colpaert, Peter" <Peter.Colpaert@xxxxxxxxxxx>
To: Rational Developer for IBM i / Websphere Development Studio
Client for System i & iSeries <wdsci-l@xxxxxxxxxxxx>
Date: 02/20/2014 08:14 AM
Subject: [WDSCI-L] CONST parameter changed?
Sent by: wdsci-l-bounces@xxxxxxxxxxxx



Hi group,

I encountered a strange issue today when coding a procedure.

In my main procedure, I call a subprocedure:

WriteAttribute(o_pdmnbr19:
o_vernbr19:
*blanks:
atride94:
atrval20);

In my WriteAttribute procedure, I have the following interface:

Dcl-proc WriteAttribute;

Dcl-pi *n;
pdmnbr_p like(pdmnbr20) const;
vernbr_p like(vernbr20) const;
colint_p like(colint53) const;
atride_p like(atride20) const;
atrval_p like(atrval20) const;
End-Pi;


At one point in the subprocedure, I do a reset of the record format containing - among other fields - ATRVAL20.

As soon as I do this Reset, the atrval_p field goes blank also.

Is this normal behaviour or am I doing something wrong?

I thought that the CONST keyword indicated that your parameter could not be changed...

Met vriendelijke groeten / Best regards,

Peter Colpaert
Software Engineer - PLM Development Team IT Operations Cluster Benelux, Philips IT

Philips Consumer Luminaires
Industrieterrein Satenrozen 11, 2550 Kontich, Belgium
Tel: (+32) 3/459 13 17
Email: Peter.Colpaert@xxxxxxxxxxx<mailto:Peter.Colpaert@xxxxxxxxxxx>

Working from home on Wednesdays


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