How to create and access global variable which is defined on the preferences tab to another windows?

Question

I'm working on a plugin modification which is a tool for exporting gltf. On the export windows, we have a choice to put "Copyright" & "Default Texture Location" parameters as you can see here :

I wanted to add some input into the preferences tab of the addon by adding two input :

• Default Texture Location
• Default Copyright Name

That way, we could just set this one time and no need to make some operator presets etc..

My code is for the preference part is :

## class to add the preference settings
class addSettingsPanel(bpy.types.AddonPreferences):
    bl_idname = __package__
settings_default_texture_location: bpy.props.StringProperty (
    name = "Default Texture Location",
    description = "Default Texture Location",
    default = "../texture"

)



settings_default_copyright: bpy.props.StringProperty (
    name = "Default Copyright Name",
    description = "Default Copyright Name",
    default = ""

)

##bpy.types.Scene.toto = settings_default_copyright


bpy.types.Scene.my_sel_value = bpy.props.StringProperty(name="Sel")
## draw the panel in the addon preferences
def draw(self, context):
    layout = self.layout
    box = layout.box()

    ##row = layout.row()
    col = box.column(align = True)

    ## texture default location
    col.prop(self, 'settings_default_texture_location', expand=True)

    ## default copyright
    col.prop(self, 'settings_default_copyright', expand=True)

The question is :

How to access to these values in the export windows, which is on another file to show it in the first image instead of the blank label "Textures" and "Copyright" ?

EDIT :

As @brockmann Suggested in the comments,

I modified the code to :

preferences = bpy.context.preferences
addon_prefs = preferences.addons[__package__].preferences
export_copyright: StringProperty(
    name='Copyright',
    description='Legal rights and conditions for the model',
    default=addon_prefs.settings_default_texture_location
)

But I've got the error " KeyError: ... key "Blender2MSFS.exporter" not found. So I tried to manually put "Blender2MSFS" instead of package and it is not working too.

The code is here : https://github.com/btronquo/Blender2MSFS2 exporter/init.py (line 96,97 and then 129 / 151)

Answer 1

In the menu.

Could simply set these values in the menu function, which is how most users will invoke the operator (filebrowser). This will "fill in" the exporter properties with those set in the addon prefs.

Note have simply named same as exporter prop, eg export_texture_dir rather than the "long winded" settings_default_texture_location

exporter/__init__.py circa line 962

def menu_func_export(self, context):
    # get the addon name
    name = __name__.split(".")[0]
    preferences = context.preferences.addons.get(name)
    op = self.layout.operator(ExportExtendedGLTF2.bl_idname, text='extended glTF 2.0 (.glb/.gltf) for MSFS')
    if preferences:
        addon_prefs = preferences.preferences
        op.export_copyright = addon_prefs.export_copyright
        op.export_texture_dir = addon_prefs.export_texture_dir

How do I change the default settings of export operators?

Alternatively could do same in the operators invoke method.