Subscribe via RSS
Toggle Submenu
  1. Categories
  2. Recent
  3. Tags
View Replies (3)

Resolved Cast Datawindow to DataStore

  1. How-to
0
Votes
Undo
  1. Paweł Kasperek
    Paweł Kasperek
  2. PowerBuilder
  3. Thursday, 29 February 2024 16:11 PM UTC

Hi,

I have got a question about the possibility of casting an instance of Datawindows to DataStore or vice-versa. I wrote multiple functions with the same body (functionality) but different argument types Datawindow and DataStore. I didn't duplicate these functions. Is it possible to cast Datawindow to Datastore ?

Pawel

PB2022 R2 TabbedView controllable features?
Is saving a window in PB 2022 R3 slow?
Accepted Answer
Ronnie Po
Ronnie Po Accepted Answer Pending Moderation
  1. Thursday, 29 February 2024 16:38 PM UTC
  2. PowerBuilder
  3. # Permalink

If you have time to re-architect your app, mike s did a cool presentation about creating a common ancestor for DataWindow, DataStore, DataWindowChild:

https://www.youtube.com/live/VfiC_3mntF0?si=Mmwf6mKYdXzUcfR4

Another option would be to re-code your functions using PowerObject variables in place of DataWindow and DataStore variables, and use dynamic method calls, e.g.

lpo_1.dynamic insertRow(0)

instead of

dw_1.insertRow(0) or ds_1.insertRow(0)

 

Comment
There are no comments made yet.
Responses (3)
Francisco Martinez @Appeon
Francisco Martinez @Appeon Accepted Answer Pending Moderation
  1. Thursday, 29 February 2024 16:38 PM UTC
  2. PowerBuilder
  3. # 1

Hi Paweł,

I believe a straight cast is not possible, because both objects are inherently different types (even if they share a common interface). However, I think it's possible to convert from one to the other manually, please see this previous community forum post on the matter: https://community.appeon.com/index.php/qna/q-a/how-to-have-a-single-function-works-on-both-a-datawindow-and-a-datastore

 

Regards,
Francisco

Comment
Paweł Kasperek
  1. Paweł Kasperek
  2. Saturday, 2 March 2024 13:14 PM UTC
Thank You for links and helpful answers. After watching webinar of Mark Searer I decided to write my own decorator object for Datawindow and Datastore objects.
  1. Helpful
There are no comments made yet.
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 29 February 2024 16:43 PM UTC
  2. PowerBuilder
  3. # 2

Hi Paweł;

  Unfortunately no. :-(

  That is because the DC & the DS controls are not aligned in the System Class hierarchy.Thus no related inheritance between the two.  :-(

You can see this in the PB IDE's  object browser ...

FWIW: What I do in my STD Framework for common code implementation is to use a Global Function & pass a "PowerObject" Object Pointer. Then cast that POP in the GF to the correct object class based on using a TypeOf() command introspection.  HTH

Regards .. Chris

Comment
There are no comments made yet.
  • Page :
  • 1


There are no replies made for this question yet.
However, you are not allowed to reply to this question.