Re: self-extending subfile and multiple selection?

Charles,

I believe this article illustrates using data queues to accomplish what you
want.

http://www.itjungle.com/mpo/mpo052302-story05.html

I hope it helps,

Marco.


On 3/22/06, Charles St-Laurent <dringpiece@xxxxxxxxxxx> wrote:
>
> 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
>
>
>
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