ReferenceError: объект со слабой ссылкой больше не существует в Kivy Refreshing AsyncImage - PullRequest
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ReferenceError: объект со слабой ссылкой больше не существует в Kivy Refreshing AsyncImage

0 голосов
/ 01 августа 2020

Я новичок в python и kivy, и у меня возникла следующая проблема.

У меня есть этот код в моем main.kv 

<FirstScreen>:
    image_step: image_step.__self__
    lblTest: lblTest
    BoxLayout:
        orientation: "vertical"
        
        BoxLayout:
            size_hint: [1,3]
            CheckBox:
                on_active: root.task_checked_event(self, self.active)
                size_hint: [0.2, 0.2]
                pos_hint: {'y': 0.35} 
            
            Label:
                id: lblTest
                text: "Check if completed"
                size_hint: [0.5, 0.5]
                pos_hint: {'y': 0.2} 
            AsyncImage:
                id: image_step
                size_hint: [1, 1]
                
        BoxLayout:
            spacing: 20
            padding: [10, 10]    
            Button:
                text: "Previous"
                size_hint: [0.5, 0.5]
                on_release: root.previous_step_event()
                
                
            Button:
                text: "Next"
                size_hint: [0.5, 0.5]
                on_release: root.next_step_event()

Тогда мой код main.py в kivy 

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty, StringProperty
from kivy.core.window import Window
from kivy.utils import get_color_from_hex
from service_thread import Services
from signal_senders import SignalSenders
from pydispatch import dispatcher
import time

import sys
import threading


#Hex convertido desde RGB en la pagina:
#https://www.rapidtables.com/convert/color/rgb-to-hex.html
Window.clearcolor = get_color_from_hex('000000')

class FirstScreen(Screen):
    image_step = ObjectProperty(None)
    #relative_path = StringProperty('avatar.jpg')
    #lblTest = ObjectProperty(None)
    
    def __init__(self, **kwargs):
       super(Screen, self).__init__(**kwargs)
       self.sender_signals_props = SignalSenders() #Objeto para acceder a sus atributos senders y signals para pyDispatcher
       dispatcher.connect(self.update_gui, 
                          signal=self.sender_signals_props.thread_signal, 
                          sender=self.sender_signals_props.thread_sender)
       dispatcher.connect(self.file_path_received_event, 
                          signal=self.sender_signals_props.thread_filepath_signal, 
                          sender=self.sender_signals_props.thread_filepath_sender)
     
       
       self.step_number = 1
       self.step_word = "step"
       self.steps_images_dictionary = {'test': 'avatar.jpg'}
       
       #self.image_step.source = self.steps_images_dictionary['test'] #Inicializo la primera imagen con el elemento 1 del diccionario.
      
       self.image_step.source = self.steps_images_dictionary['test']
       
       self.services = threading.Thread(target=Services) 
       self.services.start() #Iniciar el background task! :D
       
       
    def update_gui(self, message=""):
        pass
        
    def file_path_received_event(self, event_args):
        #Recibir el path relativo de la imagen
        key_word = f"{self.step_word}{self.step_number}"
        self.steps_images_dictionary[key_word] = event_args
        
        print(f"Step number: {self.step_number}\n{self.steps_images_dictionary}")
        #self.image_step.source = "./Fotos/area1/meliodas1.jpg" #self.steps_images_dictionary[key_word]
        print("Antes de actualizar la imagen!")
        self.image_step.source = "./Fotos/area1/meliodas1.jpg" #Try 1
        #self.ids.image_step.source = "./Fotos/area1/meliodas1.jpg" #Try 2
        print("Despues de actualizar la imagen!")
        
        self.step_number += 1
    
    def task_checked_event(self, instance, active):
        #self.stop_service = active
        dispatcher.send(message=active, 
                        signal=self.sender_signals_props.main_signal, 
                        sender=self.sender_signals_props.main_sender)
            
    
    def next_step_event(self):
        try:
            pass
        except:
            print(f"Something went wrong: {sys.exc_info()[0]}")
        
    def previous_step_event(self):
        try:
            pass
        except:
            print(f"Something went wrong: {sys.exc_info()[0]}") 
    
        

class MainApp(App):
    def build(self):
        return FirstScreen()
        
MainApp().run()

У меня есть pydispatcher в другом потоке, поднимающий file_path_received_event, который отправляет строку локального пути, в котором я сохранил файл. Когда я пытаюсь "Refre sh" изображение, которое я сейчас показываю в gui, я получаю следующую ошибку: 

[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Loader      ] using a thread pool of 2 workers
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
Step number: 1
{'test': 'avatar.jpg', 'step1': './Fotos/area1/meliodas1.jpg'}
Antes de actualizar la imagen!
Despues de actualizar la imagen!
Comenzando a contar
[INFO   ] [Base        ] Leaving application in progress...
 Traceback (most recent call last):
   File "C:\Users\52662\Desktop\Proyectos\DELTA\IoT\RaspberryPi\User_Interface\User_Interface\main.py", line 105, in <module>
     MainApp().run()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\app.py", line 855, in run
     runTouchApp()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\base.py", line 504, in runTouchApp
     EventLoop.window.mainloop()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 747, in mainloop
     self._mainloop()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 479, in _mainloop
     EventLoop.idle()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\base.py", line 339, in idle
     Clock.tick()
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\clock.py", line 591, in tick
     self._process_events()
   File "kivy\_clock.pyx", line 384, in kivy._clock.CyClockBase._process_events
   File "kivy\_clock.pyx", line 414, in kivy._clock.CyClockBase._process_events
   File "kivy\_clock.pyx", line 412, in kivy._clock.CyClockBase._process_events
   File "kivy\_clock.pyx", line 154, in kivy._clock.ClockEvent.tick
   File "kivy\_clock.pyx", line 86, in kivy._clock.ClockEvent.get_callback
   File "C:\Users\52662\Anaconda3\lib\site-packages\kivy\weakmethod.py", line 56, in is_dead
     return self.proxy is not None and not bool(dir(self.proxy))
 ReferenceError: weakly-referenced object no longer exists
Despues de contar
Step number: 2
{'test': 'avatar.jpg', 'step1': './Fotos/area1/meliodas1.jpg', 'step2': './Fotos/area1/meliodas2.jpg'}
Antes de actualizar la imagen!
Despues de actualizar la imagen!
Comenzando a contar
Despues de contar
Step number: 3
{'test': 'avatar.jpg', 'step1': './Fotos/area1/meliodas1.jpg', 'step2': './Fotos/area1/meliodas2.jpg', 'step3': './Fotos/area1/meliodas3.jpg'}
Antes de actualizar la imagen!
Despues de actualizar la imagen!
Comenzando a contar
Despues de contar
Step number: 4
{'test': 'avatar.jpg', 'step1': './Fotos/area1/meliodas1.jpg', 'step2': './Fotos/area1/meliodas2.jpg', 'step3': './Fotos/area1/meliodas3.jpg', 'step4': './Fotos/area1/meliodas4.jpg'}
Antes de actualizar la imagen!
Despues de actualizar la imagen!
Comenzando a contar
Despues de contar
Step number: 5
{'test': 'avatar.jpg', 'step1': './Fotos/area1/meliodas1.jpg', 'step2': './Fotos/area1/meliodas2.jpg', 'step3': './Fotos/area1/meliodas3.jpg', 'step4': './Fotos/area1/meliodas4.jpg', 'step5': './Fotos/area1/meliodas5.jpg'}
Antes de actualizar la imagen!
Despues de actualizar la imagen!
Comenzando a contar
Despues de contar
{'area': 'area1', 'files': {'image1': 'meliodas1.jpg', 'image2': 'meliodas2.jpg', 'image3': 'meliodas3.jpg', 'image4': 'meliodas4.jpg', 'image5': 'meliodas5.jpg'}}
Services Thread Ended!

Я использую python 3.8, Windows 10, IDE Spyder . Если необходимо разместить изображения, я могу это сделать, без проблем. Может ли кто-нибудь помочь мне с этим?

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