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  1.  Home
  2. RPG400-L
  3. July 2005

Display file I/O to and from results data structures

All,
I've been using results data structures to physical and logical files with little trouble. Thought I'd see how they worked with display files and in particular subfiles. 

Got bit by a couple of things:
1) When reading a subfile, you often access fields defined normally defined as output only. Since you specify LIKEREC(xxxx:*INPUT) you don't get those fields.
2) Unlike physical/logical files, you can't read using a DS defined LIKEREC(xxxx:*INPUT) then do an UPDATE using the same DS. 

My solutions:
1) Change all fields to be Input/Output. Use DSPATR(PR) and a "never on" conditioned DSPATR(UL) so the fields look like Output only.
2) Define another DS as LIKEREC(xxxx:*OUTPUT), since all fields are defined Input/Output, I can move the Input DS to the output DS and update via the output DS. 

All and all, it works, but seems kind of messy.

Am I missing something that would make this better?

Is anybody actually doing this all the time?
What's the most popular way to make a field defined as Input/Output look like an output only to the user? 

Thanks,
Charles Wilt

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