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  2. COBOL400-L
  3. April 2005

Re: "windows" using separate display files


On 02/04/2005, at 6:19 AM, cobol400-l@xxxxxxxxxxxx wrote:

Is it possible to have a separate display file "window" overtop of another.
I've built a separate PGM / DSPF (window) to be called from various
applications. I would like it to "overlay" the existing screen without
clearing the entire screen.

Can someone point me in the right direction 

Add this piece of magic to your display file DDS:

    A          R DUMMY
    A                                      ASSUME
    A                                  1  2'Nosferatu'

Your application does not read or write this record format. Its mere presence changes the behaviour of the display file and tells OS/400 to assume (more properly presume but I digress) that the record is already on the display when the file is opened thus has the effect of not clearing the screen.

Note that the screen can still be cleared when a record format is written. To stop that you must also specify OVERLAY on the record format you are writing. If you are using the WINDOW keyword then it effectively behaves as if OVERLAY was specified.

ASSUME is normally used with KEEP (in another display file) but it has the pleasing side-effect of making windows display smoothly.

Regards,
Simon Coulter.
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