Re: incorrect cursor position -- LINUX5250

Mark

This is Kenneth from the tn5250j project. I would be happy to talk shop about the cursor positioning. Well that is in about a week's time that is as tomorrow I will be leaving on vacation for a week and will not be back until the beginning of June. I also went on a crusade to get that working, not in the emulator but another project and it came out quite well. Have not had the time to put it into the emulator project nor the want to dig that deep again.

It is possible though to get it almost 100% even on restoring the windows from savescreen and restorescreen functions. The first thing that will have to be done is get the enhanced functions turned on and working, then there is the exact flags in the query response back to the controller to return the IC and MC commands in the correct order. Let me tell you it was almost a solid three weeks flipping bits and options and then interpreting them. The tn5250j is still not correct until I sit down and start putting it into there.

I hope this helps and again would be glad to talk to someone on this to get another persons view. What do you say? You want to put this crusade together and all three projects benefit? Yes I know the code is a mess but it has been progressing since the last time you looked at it.

Regards

Kenneth

From: MarkB@xxxxxxxxxx
Reply-To: Linux 5250 Development Project <linux5250@xxxxxxxxxxxx>
To: Linux 5250 Development Project <linux5250@xxxxxxxxxxxx>
Subject: Re: [LINUX5250] incorrect cursor position
Date: Wed, 21 May 2003 12:57:01 -0400


If you do a search of the archives you'll be sure to see that cursor
positioning is (surprisingly) not a trivial matter.
http://search.midrange.com/htsearch.cgi?config=archive&restrict
=%2Flinux5250&exclude
=&format=bultin-long&method=and&sort=score&words=cursor

I've brought up this topic on this forum before as I've noticed
inconsistencies as well. (I happen to be writing a from-scratch, Java 5250
library and have been looking to tn5250's cursor logic to solve my own
cursor problems.)
I figured if I can help/inspire/provoke someone else to get it done,
there's a greater chance I can get it working as well.

Just to let anyone know:
I'm at the stage with my emulator that the only thing not working is cursor
positioning (similarly, in rare cases). I do have other things on the go
and cursor positioning is not a high priority, but if I _ever_ figure this
one out, I'll be sure to let you all know how it's done. (Cursor
positioning has become a personal crusade for me).


A GUESS:
I don't have the tn5250 code in front of me right now but:
In your particular case (since your file is redisplayed) might it be the
case that a SaveScreen/RestoreScreen  sequence is happening?
If so, I've noticed in documentation
http://publib.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/CO2E2001/CCONTENTS
that ReadScreen SaveScreen commands are not supposed to save cursor
positioning data, but *as I understand* tn5250's implementation is to send
and re-interpret a previous WTD command which can affect cursor
positioning. This *may* be the source of some trouble in this situation or
others but I'm not 100% sure.
Just out of curiosity I'd be interested in seeing the trace if you could
send me a zipped version.

Finally,
I sincerely wish the best of luck to anyone attempting to tackle cursor
placement issues.
My experiences have been that it's just not easy.
If anyone wants to "talk shop" on cursor placement, I'd be happy to oblige.

-Mark
email:
markb
cms400
com

Sean Porterfield <sporter@xxxxxxxxxx To: linux5250@xxxxxxxxxxxx om> cc: Sent by: Subject: [LINUX5250] incorrect cursor position linux5250-bounces@x idrange.com


                      19/05/2003 12:00 PM
                      Please respond to
                      Linux 5250
                      Development Project


We have a display file that has one input capable field.  Keying an
option in the field runs a program.  After that program exits, the
display file is redisplayed.

Most of the display files like this work fine.  This one and a few
others are leaving the cursor in the wrong position.

Field starts at position 7.  Key a 1 in the field (to run option 1)
cursor naturally moves to position 8.  Press enter to execute the
program, return, cursor is in position 8 but the 1 that was keyed is gone.

That field is not cleared in the program, so it must be DDS taking the
"1" out.

Keywords in the DDS: PUTOVR, ERASEINP, OVERLAY.

Behavior in Client Access is as expected; cursor returns to position 7
every time.

I created a trace file, but it doesn't mean much to me.

I also noticed that the cursor will return to any position on the screen
when it is displayed again.  It's not particular to the field.

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