RE: Build PLIST at runtime

When I was designing/programming an order entry system I had the same
challenge.  What I did as define all lookups with the same parameter
list.  For all lookups, I call a single program that determined which
program to call and put that name in a field.  Using that field as the
program name, I called the lookup program.  Then when the user selected
the record in the lookup subfile, I put that record into the *LDA and
returned to the caller.  I would move the *LDA into a data structure of
that record time.  Now you have the complete lookup record.

Marvin


date: Fri, 9 Jul 2004 11:26:20 -0230
from: dclowe@xxxxxxxxxx
subject: Build PLIST at runtime

Hi,  I don't know if this can be done or not but I'm going to have a
crack 
at it.

I'm trying to create a program that calls other programs based on the 
program name and parameters that are determined at runtime.  My first 
attempt has not been too successful, I have two RPG programs: CALLER and

CALLEE.  Here is the source:

Program CALLER:
     d in              s               *

     d f00007s02       s              7s 2
     d f00007s02p      s               *

     c
     c                   eval      f00007s02 = 100
     c                   eval      f00007s02p = %addr(f00007s02)
     c                   eval      in = f00007s02p

     C                   call      'CALLEE'
     C                   parm                    pn               10
     C                   parm                    in
     c                   parm      0             out              11 2

     c                   eval      *inlr = *on

Program CALLEE

     C     *entry        plist
     C                   parm                    part             20
     C                   parm                    inqty             7 2
     C                   parm                    outqty           11 2

     c                   eval      outqty = inqty * 2

     c                   eval      *inlr = *on 

I would have expected that the INQTY field in CALLEE would have been 
populated with the value 100 which I assigned to it in the CALLER
program. 
 The program runs and bombs in CALLEE with decimal data error.  Now, why

am I trying to do this?  Well I want to call my lookup programs in a 
generic fashion from a single program but I don't want to have a huge 
select statement saying when the program is CALLEE use this Plist and so

on,  I want to pass in the name of the program and what it's parameter 
types and values are and call the program.  (I will also want to
retreive 
the program's updated variables when I get back to CALLER).

Does this make sense, do you think it can even be done?  TIA for your 
help.

Dean Clowe