Re: Subfiles as program defined?

[Scott Klement <klemscot@xxxxxxxxxxxx>]

Writing a program defined screen shouldn't be that hard...  just use
DSPFFD to see what positions you need to input/output stuff to.

However, I wonder if it wouldn't be better in the long run to make it
externally defined?   Obviously, you'd have to do something like 
"eval  SDIV2 = SDIV"  (for each SDIV field) after each read of the
screen...  But how many places does the screen get read?   




On Wed, 18 Apr 2001, Jim Langston wrote:

> I am modifying a vendors program putting in a subfile into a
> display file (thanks for all the help on this).  Now I am in
> the RPG source, which was RPG III.  I converted this to RPG IV
> using CVTRPGSRC and recompiled and it runs fine using the 
> display file I modified, although I have yet to change the RPG
> program to use the subfile.
> 
> Now I get to the hard part.  This program was, apparently, 
> converted from a S36 program who knows how long ago, but no one
> ever bothered to declare the files as externally defined.  
> 
> Including the display file.
> 
> So now I have a quandary.  I either have to go about modifying the
> program to use the external declarations for the display file, or
> learn how to use a display file subfile using internal file specs.
> 
> I would think it would be easiest to simply make the file externally
> defined and change the field names... but I'm running into stuff like
> this:
> 
>  ISTR002FM  NS  01    1 C1                            
>  I                                  2    3  SDIV      
>  I                                  2    3  SDIV1     
>  I                                  2    3  SDIV2     
>  I                                  2    3  SDIV3     
>  I                                  4   33  CONAME    
> ...
> 
> D                 DS                      
> D  BLCKEY                 1     31        
> D  K29                    1     29        
> D  CBLKEY                 1     14        
> D  SDIV1                  1      2        
> ...
>                                           
> D                 DS                      
> D  ACTKEY                 1     17        
> D  SCUST3                 1      6        
> D  SDIV3                  7      8        
> ...
>                                           
> D                 DS                      
> D  UDATA2                 1     32        
> D  UBL2                   1     14        
> D  DIV2                   1      2        
> 
> As you can see, the field in positions 2 and 3 has be defined 4 
> different times!  SDIV, SDIV1, SDIV2, SDIV3.  They obviously did
> this (it was the same way in the originally RPG III code, except the
> DSs were described in the I specs instead of the D specs) because you
> can't put the same field in more than one different data structure.
> 
> So... if I make the display file externally defined, I only get one
> one definition of the division (SDIV) and I can't get this program to
> compile anymore without fixing the program to move the SDIV to the
> different key fields before chaining.  Which will probably produce
> bugs one way or another.
> 
> So, how hard is it to use a sufile as program defined (which I really,
> really hate to do).
> 
> Regards,
> 
> Jim Langston

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