I was trying to make a simple flask and kivy app, but when i run the app it gives me an typeerror. I am facing an issue, i took this code from [here](https://stackoverflow.com/questions/49884548/how-to-run-kivy-and-flask-apps-together)
Here's my code:
import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen
# common modules
import sys
import os
import time
import signal
from multiprocessing import Process
# Flask modules
from flask import Flask
# wsgi (Web Server Gateway Interface) modules
import eventlet
from eventlet import wsgi
# async server setup
app = Flask(__name__)
def signal_handler(signal, frame):
print (" CTRL + C detected, exiting ... ")
exit(0)
# kivy gui classes ######################################################
class MainScreen(Screen):
def __init__(self, **kwargs):
self.name="MAIN SCREEN"
super(Screen, self).__init__(**kwargs)
class MainApp(App):
MainScreenTitle = "MainScreen title"
MainScreenLabel = "MainScreen label"
MessageButtonEnter = "START"
MessageButtonExit = "EXIT"
def start_Flask(self):
print("Starting Flask...")
wsgi.server(eventlet.listen(('', 5000)), app) # deploy as an eventlet WSGI server
def start(self):
print ("starting Flask as process...")
global p1
p1 = Process(target=self.start_Flask) # assign Flask to a process
p1.daemon = True
p1.start() #launch Flask as separate process
def stop(self):
print ("terminating Flask and exiting...")
global p1
p1.terminate()
exit(1)
def build(self):
sm = Builder.load_string("""
ScreenManager
MainScreen:
size_hint: 1, .7
auto_dismiss: False
title: app.MainScreenTitle
title_align: "center"
BoxLayout:
orientation: "vertical"
Label:
text: app.MainScreenLabel
BoxLayout:
orientation: "horizontal"
spacing: 10
size_hint: 1, .5
Button:
text: app.MessageButtonEnter # start app
on_press:
app.start()
Button:
text: app.MessageButtonExit # exit app
on_press:
app.stop()
""")
return sm
# main ################################################
if __name__ == '__main__':
#CTRL+C signal handler
signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)
MainApp().run() # run Kivy app
But it is giving me an error:
[INFO ] [Logger ] Record log in C:\Users\Welcome\.kivy\logs\kivy_21-07-22_40.txt
[INFO ] [deps ] Successfully imported "kivy_deps.angle" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.glew" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.sdl2" 0.3.1
[INFO ] [Kivy ] v2.0.0
[INFO ] [Kivy ] Installed at "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\__init__.py"
[INFO ] [Python ] v3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)]
[INFO ] [Python ] Interpreter at "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\pythonw.exe"
[INFO ] [Factory ] 186 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [Window ] Provider: sdl2
[INFO ] [Window ] Activate GLES2/ANGLE context
[INFO ] [GL ] Using the "OpenGL" graphics system
[INFO ] [GL ] Backend used <angle_sdl2>
[INFO ] [GL ] OpenGL version <b'OpenGL ES 2.0.0 (ANGLE 2.1.13739 git hash: 385fb40fd460)'>
[INFO ] [GL ] OpenGL vendor <b'Google Inc.'>
[INFO ] [GL ] OpenGL renderer <b'ANGLE (Mobile Intel(R) 965 Express Chipset Family Direct3D11 vs_4_0 ps_4_0)'>
[INFO ] [GL ] OpenGL parsed version: 2, 0
[INFO ] [GL ] Shading version <b'OpenGL ES GLSL ES 1.00 (ANGLE 2.1.13739 git hash: 385fb40fd460)'>
[INFO ] [GL ] Texture max size <8192>
[INFO ] [GL ] Texture max units <16>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [Base ] Start application main loop
[INFO ] [GL ] NPOT texture support is available
starting Flask as process...
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "D:\my projects of python\Safar\new 1.py", line 100, in <module>
MainApp().run() # run Kivy app
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\app.py", line 950, in run
runTouchApp()
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 582, in runTouchApp
EventLoop.mainloop()
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 347, in mainloop
self.idle()
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 391, in idle
self.dispatch_input()
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 342, in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 248, in post_dispatch_input
listener.dispatch('on_motion', etype, me)
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\core\window\__init__.py", line 1412, in on_motion
self.dispatch('on_touch_down', me)
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\core\window\__init__.py", line 1428, in on_touch_down
if w.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\screenmanager.py", line 1198, in on_touch_down
return super(ScreenManager, self).on_touch_down(touch)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\widget.py", line 545, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\relativelayout.py", line 297, in on_touch_down
ret = super(RelativeLayout, self).on_touch_down(touch)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\widget.py", line 545, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\widget.py", line 545, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\widget.py", line 545, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\uix\behaviors\button.py", line 151, in on_touch_down
self.dispatch('on_press')
File "kivy\_event.pyx", line 705, in kivy._event.EventDispatcher.dispatch
File "kivy\_event.pyx", line 1248, in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx", line 1132, in kivy._event.EventObservers._dispatch
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\lang\builder.py", line 57, in custom_callback
exec(__kvlang__.co_value, idmap)
File "<string>", line 21, in <module>
File "D:\my projects of python\Safar\new 1.py", line 53, in start
p1.start() #launch Flask as separate process
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\process.py", line 121, in start
self._popen = self._Popen(self)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\context.py", line 326, in _Popen
return Popen(process_obj)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
reduction.dump(process_obj, to_child)
File "C:\Users\Welcome\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
File "stringsource", line 2, in kivy._event.EventDispatcher.__reduce_cython__
TypeError: no default __reduce__ due to non-trivial __cinit__
Any help will be greatly appreciated.
