Hello, i developed an addon with the use of bpy.msgbus.subscribe_rna like a handler to call a function in my script whenever a specified property, in this case whenever the render engine changes, changes.
My question is how can i make it persistent like it is used to do with the handlers? Adding @persistent above the function that gets called DOESN’T make it persistent.
Here are the pieces of code:
# some code
# function that gets called whenever the render engine changes
# other code
# registering some classes here
# definition msgbus to update the function whenever the render engine updates
subscribe_to = bpy.types.RenderSettings, "engine"
bpy.types.Scene.something = object()
key = subscribe_to,
owner = bpy.types.Scene.something,
args = (),
notify = function
From just a glance, they look like debug prints, which if true, implies they will eventually go away.
An alternative is they are logging messages which means they are controlled by a setting.
tl;dr: I have no practical idea.
@nacioss how did you tdo to make it persistent at tge end ?
with an handler ? because it seem that neither
there’s a set(‘PERSISTENT’) args within the fuction
bpy.msgbus.subscribe_rna(data, owner, args, notify, options=set()
.. function:: subscribe_rna(data, owner, args, notify, options=set())
:arg key: Represents the type of data being subscribed to
- :class:`bpy.types.Property` instance.
- :class:`bpy.types.Struct` type.
- (:class:`bpy.types.Struct`, str) type and property name.
:type key: Muliple
:arg owner: Handle for this subscription (compared by identity).
:type owner: Any type.
:arg options: Change the behavior of the subscriber.
- ``PERSISTENT`` when set, the subscriber will be kept when remapping ID data.
:type options: set of str.
Returns a new vector int property definition.
also, how to verify if the msgbus is not active yet before subscribing to rna ? and how do clear an active msg bus ?
didn’t figurate how to use bpy.msgbus.clear_by_owner() as a logical args like the rna bpy.type didn’t work out
for example : bpy.msgbus.clear_by_owner(bpy.types.ParticleSettings)
there’s so little information about msgbus. it’s quite useful