Is it possible to get BP's variable's changed value from python?

[arafat0007]

In blueprint i have a variable of 'array of color array' type. In blueprint graph, i set new values in it and then call python script for further process.

When i access the variable from the python script, i get the initial value of the variable, not the set up ones. Is it possible to get the changed variable value from python.

to get value what i do,

1. load asset object x = ue.load_object(parameter)
2. then Array = x.GeneratedClass.get_cdo().ArrayOfBP

[jonlm]

In general you should be able to get blueprint variable value by simply accessing it as a python attribute on the blueprint instance. If I create a variable named "test_color" of type color array in a blueprint and add that blueprint to the scene, I can do this while the blueprint actor is selected:

>>> print(ue.editor_get_selected_actors()[0].test_color[0])
<unreal_engine.FColor {'r': 1, 'g': 1, 'b': 255, 'a': 255}>

In that case there was one item in the array with those values.

BTW, can a BP variable really be an "array of array"? I don't see how to do that.

[arafat0007]

hello @jonlm , thank you so much for the response. let me explain more.

i get the pixel values of texture and save it to ’Image Array’ (initially 'Image Array' is empty) just like above picture. But when i tried to get the 'Image Array' variable by 'GeneratedClass.get_cdo().ImageArray' after loading the object just like my texts at question, i get the initial empty array from initial value. I dont get the value stored in 'Image Array' from my C++ function.

Then I tried with simple things and it seems that, say a variable by default has 10 as value. now, if i change the value from 10 to 20 by set variable node, from python i always get the variable's value as 10, not the set up value 20 which i did in BP graph.

Image Array is like this,

I am not aware of right words and i am beginner and learning. So, while in runtime, python does not get the changed value, rather gets the default value of editor? is it?

[jonlm]

Look closely at my example above. You need to get a handle to the blueprint instance in your scene. In my example I'm getting that with "ue.editor_get_selected_actors()". Once you are pointing at the instance, accessing the variable with standard python dot notation (i.e. "bp_object.image_array") should give you the instance-modified value.

GeneratedClass.get_cdo() is by definition giving you only the default object, not the instance.

[arafat0007]

Here is what i have done.

1. add an actor in editor. Actor has a test bool variable. default value is true.
   
2. there is a button onclick in widget. In widget graph i take the actor's test and change it to false. and call python script.
   
3. In python script, i get actor bp obj and call test which is still true which i changed before. ue.editor_get_selected_actors() returns empty array.
   
   and result is,
   
   Where i am doing mistakes?

[arafat0007]

https://github.com/20tab/UnrealEnginePython/issues/516

by traversing, it is easy to access blueprint and get what is needed