Re: Field value - Pointers

I would have been utterly surprised if they had been different :-)

One thing I use pointers for (besides reading through user spaces) is
interpreting source files.  I have an include member with pointer based data
structures for the different types of RPG (III and IV) and DDS
specifications.  When reading a source line, I point the right data
structure (based on member type and line type) at SRCDTA, so I can access
the subfields of the source line.

Joep Beckeringh


----- Original Message -----
From: "Rob Berendt" <rob@dekko.com>
To: <RPG400-L@midrange.com>
Sent: Monday, April 17, 2000 6:08 PM
Subject: Re: Field value - Pointers


> In fact I ran the following program.  The divide by zero was
> to create a dump - can't DSPLY pointers.  And in the dump, both
> of the pointers have the same value.
>
> FIIM       IF   E             DISK
> D IDESC           DS
> D  DESC8                         8A
>
> D POINTER         S               *
> D POINTER2        S               *
>
> D X               S              1P 0
> C                   READ      IIM
> C     IDESC         DSPLY
> C     DESC8         DSPLY
> C                   EVAL      POINTER=%ADDR(IDESC)
> C                   EVAL      POINTER2=%ADDR(DESC8)
> C                   EVAL      X=1/X
> C                   EVAL      *INLR=*ON
>
>
>
>
>
>
> Rob Berendt
> 04/17/2000 10:21 AM
> To: RPG400-L@midrange.com@Internet
> cc:
> Fax to:
> Subject: Re: Field value - Pointers
>
> Excellent response.  You're right.  It also shows that you understand what
the pointer is doing.
> Boils down to personal preference.
>
>
>
> joep@beckeringh.myweb.nl on 04/14/2000 07:46:29 PM
> Please respond to RPG400-L@midrange.com@Internet
> To: RPG400-L@midrange.com@Internet
> cc:
> Fax to:
> Subject: Re: Field value - Pointers
>
> Rob,
>
> Nothing wrong with pointers, but you don't need those for what you are
> doing: good old data structures suffice for this.
>
> Joep Beckeringh
>
>
> ----- Original Message -----
> From: "Rob Berendt" <rob@dekko.com>
> To: <RPG400-L@midrange.com>
> Sent: Thursday, April 13, 2000 11:44 PM
> Subject: Re: Field value - Pointers
>
>
> > You're right.  I've sent my apologies.
> >
> > However, this pointer stuff is great.  I am writing a program and found
> another use for it.  Check out:
> >
> >  * DDS only allows us to have 10 character field names.  Therefore
> >  * we will print PRTMSG.  However we want the value of PRTMSG to
> >  * always be the value of ExceptionId.
> > D PrtMsgP         S               *   inz(%addr(ExceptionId))
> > D PrtMsg          S                   like(ExceptionId) based(PrtMsgP)
> >
> >  * We want to print the first 70 characters of ObjectName.  Therefore
> >  * we will print the field Objname which will always contain the first
> >  * 70 characters of ObjectName.  No moves or substrings needed.
> > D ObjnameP        S               *   inz(%addr(ObjectName))
> > D Objname         S             70A   based(ObjnameP)
>
>
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