Re: Internal Display file overlay -- RPG400-L

Hi Scott,

An alternative to the FRCDTA DDS keyword is DFRWRT(*NO) on the CRTDSPF
command.  Pretty  much the same effect, but applied to all formats afaik.

Regards,
Peter Dow
Dow Software Services, Inc.
909 425-0194 voice
909 425-0196 fax

----- Original Message -----
From: "Scott Klement" <klemscot@klements.com>
To: <RPG400-L@midrange.com>
Sent: Friday, June 15, 2001 10:21 AM
Subject: Re: Internal Display file overlay


>
> Normally, OS/400 waits until you do an input operation from the screen
> before it actually displays the screen to the user.  The idea is that
> if you're going to output multiple times, it's more efficient to do all
> the output into a buffer, and then dump the buffer to the terminal once.
>
> The FRCDTA DDS keyword is used to override this behavior.  When using
> FRCDTA, every time you do a write operation to your display file, the
> screen will appear for the user.   This is assuming, of course, that
> you used DDS to create your screen...  The only other method of making
> display files that I can think of is via the Sys/36 environment, and
> I'm not entirely sure how you'd do a "FRCDTA" in that situation.
>
> Then, in your RPG program, you need to do an output operation to the
> display when you want it to show up.   As you pointed out, you can't
> use the WRITE operation unless you also pass a data structure that
> displays the fields to be displayed.   The other alternative, is to
> use EXCPT, and create output specs for your display -- that would be
> the traditional way of working with a "program described" file.
>
> HTH
>
>
> On Fri, 15 Jun 2001, Jim Langston wrote:
>
> > Short version:
> > How do I display a record format described internal to the program
> > to the display without waiting for user input before continuing?
> >
> > Long Version:
> > I'm modifying an existing program that uses an internally described
> > display file processed by the cycle.  What I am doing, or attempting
> > to do, is stick a sub file in the middle of this.
> >
> > Well, in testing I got this to work fine.  I copied the display file
> > record into 2 records, chopped out a portion that I'm going to stuff
> > my sub file into.  It works great in my test program, I display the
> > subfile (by WRITEing it) which has KEEP specified.  Then I let the
> > cycle take care of the internally described file (which has OVERLAY
> > defined) and it's doing what I want.
> >
> > But, running into a snag when I am moving it to development.  If the
> > user doesn't want the display file to be shown, I have to show the
> > original info there that was copied into another record format.
> >
> > I've tried using WRITE but RPG complains that I need a Data Structure
> > to write, which I don't want to do.  So I tried READ which works, after
> > a fashion.  It will display the display file record on the screen, but
> > then waits for an ENTER before it continues with the cycle, that just
> > ain't gonna work.
> >
> > Changing the display file to externally described is not an option in
> > this case.
> >
> > Regards,
> >
> > Jim Langston
> >
>
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