topic How to unregister CatchNewElement observers? in Archicad C++ API

How to unregister CatchNewElement observers?

BerndSchwarzenbacher — Fri, 16 Jun 2023 14:13:02 GMT

Hi all,

Did anyone of you have success with unregistering a CatchNewElement observer?
I passed a `nullptr` for the handlerProc as described in the documentation.
Unfortunately the observer doesn't seem to unregister and my Add-On is still notified by new elements.
I've tried for all elemTypes (nullptr) and for specific ones.

Context
I try to keep the Debug versions of my Add-Ons so that they are not persistently loaded.
Then I can recompile them without going into the Add-On manager or restarting Archicad.
But of course it's necessary to check behaviors of used observers.
For that it's convenient to be able to turn them off again and the Add-On is automatically unloaded.

Best,
Bernd

Re: How to unregister CatchNewElement observers?

ReignBough — Wed, 26 Jul 2023 03:46:54 GMT

Did you also put the element type you want to stop catching new element event?

Re: How to unregister CatchNewElement observers?

BerndSchwarzenbacher — Thu, 03 Aug 2023 12:44:20 GMT

Yes I've also tried it with specifying the element type.

Re: How to unregister CatchNewElement observers?

Akos Somorjai — Thu, 19 Oct 2023 06:57:29 GMT

Hi Bernd,

Have you tried to add: ACAPI_Element_InstallElementObserver (nullptr); as well?

Best, Akos

Re: How to unregister CatchNewElement observers?

BerndSchwarzenbacher — Wed, 25 Oct 2023 20:23:06 GMT

Hi Akos,

Thanks for the idea! I finally got around to trying it. Unfortunately that didn't help either. Still the same behavior,
I think I've already tried that before and this time I also tried several different orders and combinations of unregistering the observer with

ACAPI_Notify_CatchNewElements (nullptr, nullptr)
ACAPI_Notify_CatchNewElements (&tbItem, nullptr)
ACAPI_Notify_InstallElementObserver (nullptr)

and the equivalent ACAPI_Element_.... functions for AC27.

Is there a specific order of operations that you were thinking about?

Best,

Bernd

Re: How to unregister CatchNewElement observers?

Akos Somorjai — Wed, 08 Nov 2023 00:42:22 GMT

Hi Bernd,

Have you also attached an observer? (AC27: `ACAPI_Element_AttachObserver()`)

There is an `ACAPI_Element_DetachObserver()` which may help.

The order I would call these:

CatchNewElements (&tbItem, ElementEventHandlerProc)

InstallElementObserver (ElementEventHandlerProc)

AttachObserver

...

DetachObserver

InstallElementObserver (nullptr)

CatchNewElements (&tbItem, nullptr)

Best, Akos

Re: How to unregister CatchNewElement observers?

BerndSchwarzenbacher — Fri, 09 Feb 2024 07:00:27 GMT

Hi Akos,

Thanks for the further input! It took me a while to give it another try.

So now I've tried it exactly as suggested by you, but it doesn't work unfortunately. As soon as I add the outermost CatchNewElements pair (register and unregister), the Add-On's FreeData function isn't called anymore. So to me it really seems, that unregistering of CatchNewElements doesn't signal Archicad that the Add-On can be fully unloaded.

Best,

Bernd

Re: How to unregister CatchNewElement observers?

Joel Buehler — Mon, 26 Feb 2024 09:41:55 GMT

maybe a stupid suggestion but have you iterated trugh all elements with the ACAPI_Element_DetachObserver(guidOfElementLoL) call bevore calling:

err = ACAPI_Element_CatchNewElement(nullptr, nullptr);
err = ACAPI_Element_InstallElementObserver(nullptr);

my observer works just fine with attach and detach. but i didt try to unload the plugin since mine is allways loaded.

Re: How to unregister CatchNewElement observers?

BerndSchwarzenbacher — Tue, 27 Feb 2024 08:19:42 GMT

Hi Joel,

Not a stupid question at all! And thanks for chiming in with your experience 🙂

Yes I did try with detaching the observers of all elements first. Doesn't change anything and also it's the same behavior when working in an empty file.

Which makes kind of sense, since the new element observer is not attached to single elements anyway (although it might be the same function as the normal element observer).