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Resolved close event fired BEFORE deactivate event?

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  1. Yiannis Papadomichelakis
    Yiannis Papadomichelakis
  2. PowerBuilder
  3. Friday, 24 May 2024 12:14 PM UTC

Does it make sense the window close event to be fired BEFORE the window deactivate event?

I am facing a situation where I have null object references in the deactivate event, because the objects are destroyed.

  1. PowerBuilder (Appeon)
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Responses (1)
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Friday, 24 May 2024 12:39 PM UTC
  2. PowerBuilder
  3. # 1

Hi Yiannis;

  FWIW: I've learned over a few decades with many versions of PB & Windows O/S that you can never trust objects to be around in memory. I've found that various events can fire differently & change sequences as well.

   To be safe, I always wrap my code in an IsValid() method to ensure I can still operate on an object.  HTH 

Regards ... Chris 

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Yiannis Papadomichelakis
  1. Yiannis Papadomichelakis
  2. Friday, 24 May 2024 12:51 PM UTC
Sure, i tried that! No luck!

The closing window has objects that contain arrays of other objects and the problem I am facing is related to the array.

All window objects are valid, except these inside the array.

The array's size is greater than 0 but all it's elements are destroyed!

So, practicaly I have to use IsValid() in everything????
  1. Helpful
Andreas Mykonios
  1. Andreas Mykonios
  2. Friday, 24 May 2024 13:29 PM UTC
Don't know if moving that code to closequery can be an option in your case. Closequery is always executed before both close and deactivate...

Andreas.
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