def ShowMessageBox(message = "", title = "Message Box", icon = 'INFO'):
    def drawinfo(self, context):
        self.layout.label(text = message)
    bpy.context.window_manager.popup_menu(drawinfo, title = title, icon = icon)

class WIF_OP_ImportDazData(bpy.types.Operator, buttons.SingleFile, buttons.JsonFile, ImportHelper):
    bl_idname = "import_js.dazdata"
    bl_label = "Import Json"
    bl_description = "import rig data to adjust daz bones"
    bl_options = {'UNDO'}

    filter_glob: StringProperty(
                                default='*.json;*.txt',
                                options={'HIDDEN'},
                                )

    def execute(self, context):
        filename, extension = os.path.splitext(self.filepath)
        if extension == '.json':
            rigdata = read_json(context, self.filepath)
            rigs = bpy.context.selected_objects
            set_custom_props(rigs, rigdata)
        else:
            print("Select json please!")
            ShowMessageBox("Select JSON please!!", "fail load", "INFO")
       return {'FINISHED'}