RE: self-extending subfile and multiple selection?

<snip>
In the other hand, if I use a subfile with SFLSIZ = SFLPAG, how can I
trap
multiple selection in the subfile. I mean, what if the user selects a
record
in one page, press the PageDown key, and selects another record in that
page? If I clear the subfile each time the user press the PageUp or
PageDown
key, the READC won't see the selected records from the previous pages,
only
the ones in the current page, isn't it?
</snip>

There are a few ways to do this...(none are that pretty..but gets you
past the limitation you mentioned.  Any time the program regains control
(user presses F key, page key, etc..) Read the selected subfile records
& write them to a temp file or to another subfile (which can later be
used as a confirmation screen...).  When the user requests to process
the selections then you just process the temp file or subfile instead of
your active displayed subfile page.  Decide which is better temp file or
subfile prior to doing this...if you don't need a confirmation screen
prior to processing I'd go for the temp file (will be better performance
wise since using the subfile you'll likely have to define it as subfile
size > sfl page....).  Plus using the temp file you can pass the
information from the interactive process to a batch process if needed.

HTH 


Thanks,
Tommy Holden


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles St-Laurent
Sent: Wednesday, March 22, 2006 10:13 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: self-extending subfile and multiple selection?

Hi!

I read an article about self-extending subfile to navigate through data.
The
technique looks quite simple. Each time the user press the PageDown key,
or
the alternate key associated to the PageDown action, the program takes
the
control and fills the next subfile page. But if the user press the
PageUp
key, the system handles it.

There is limitations about this technique. The number of records the
subfile
can contain is still limited to 9999. What if my file contains about 300
000
entries and a maniac user tries to scroll down to the end of the file?

In the other hand, if I use a subfile with SFLSIZ = SFLPAG, how can I
trap
multiple selection in the subfile. I mean, what if the user selects a
record
in one page, press the PageDown key, and selects another record in that
page? If I clear the subfile each time the user press the PageUp or
PageDown
key, the READC won't see the selected records from the previous pages,
only
the ones in the current page, isn't it?

What's bugging me is the limited size of a self-extending subfile and
the
case of a multiple selection between pages. Is there a way to have a
self-extending subfile that can be greater than 9999 records and handles
the
selection of multiple records through different pages?

Charles St-Laurent