[python] Get Component from UBGC / UBlueprint

Development Pipeline & Plugins Editor Scripting
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1

Im creating a new blueprint, and I want to change an element on a component inside it (a StaticMeshComponent). Im not sure how to get access to components from a CDO/BGC reference. Its not an actor so all the get components are out, this all exists only in the editor not in the level.

Right now as a workaround im setting a variable then in the construction script setting the component to use the variable, but it would be nice to learn how to access to component directly

 # Paths
path = childBP.get_path_name()
path_cdo = path + "_C"

# Objects - BlueprintGeneratedClass
bp_gc = ue.load_object(None, path_cdo) 
#Objects - BGC CDO
bp_cdo = ue.get_default_object(bp_gc)

#Set variable
bp_cdo.set_editor_property("MeshToUse", a)
2

The question is still valid, but before anyone mentions this optimisation, iv switched the gc var setter to the much simpler:
bp_gc = ue.EditorAssetLibrary.load_blueprint_class(childBP.get_path_name())
which skips needing the path vars all together

3

Hi, there. I found a way to get BP components with python api, try my functions:

import unreal

def get_component_handles(blueprint_asset_path):
    subsystem = unreal.get_engine_subsystem(unreal.SubobjectDataSubsystem)

    blueprint_asset = unreal.load_asset(blueprint_asset_path)
    subobject_data_handles = subsystem.k2_gather_subobject_data_for_blueprint(blueprint_asset)
    return subobject_data_handles

def get_component_objects(blueprint_asset_path):
    objects = []
    handles = get_component_handles(blueprint_asset_path)
    for handle in handles:
        data = unreal.SubobjectDataBlueprintFunctionLibrary.get_data(handle)
        object = unreal.SubobjectDataBlueprintFunctionLibrary.get_object(data)
        objects.append(object)
    return objects

component_objects = get_component_objects('/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.BP_ThirdPersonCharacter')

if you print component_objects, will return:

LogPython: [<Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.Default__BP_ThirdPersonCharacter_C' (0x0000050161179800) Class 'BP_ThirdPersonCharacter_C'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.Default__BP_ThirdPersonCharacter_C:CollisionCylinder' (0x0000050167E84D00) Class 'CapsuleComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.Default__BP_ThirdPersonCharacter_C:Arrow' (0x0000050167E84600) Class 'ArrowComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.BP_ThirdPersonCharacter_C:CameraComponent_0__CCE3C0B4' (0
x0000050143A6CC00) Class 'CameraComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.Default__BP_ThirdPersonCharacter_C:CharacterMesh0' (0x0000050161385000) Class 'SkeletalMeshComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.BP_ThirdPersonCharacter_C:SpringArmComponent_0__A9892D03' (0x0000050147D1AC00) Class 'SpringArmComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter.BP_ThirdPersonCharacter_C:CameraComponent_0__CCE3C0B4' (0x0000050143A6CC00) Class 'CameraComponent'>, <Object '/Game/ThirdPerson/Blueprints/BP_ThirdPersonCha
racter.Default__BP_ThirdPersonCharacter_C:CharMoveComp' (0x000005013DECF000) Class 'CharacterMovementComponent'>]
4 Likes
4

I did not post this question, but this work!
Thank you so much. I am looking for this almost 1 year.

5

Than you so much, it works well in unreal 5.1 and 5.3, but it doesn’t work in Unreal 4.27, do you konw how to get components in 4.27?

6

Really thank you for this , you set me on the right path !