属性错误：模块'multiprocessing'没有属性'Event'

Question

我正在tkinter中构建一个程序，该程序在按下按钮时记录屏幕，并在另一次按下按钮时停止记录。我是按照这个答案来回答的。但是我得到

AttributeError：模块"multiprocessing"没有属性"Event">

在线

e=多处理。事件((

这是我的代码

import multiprocessing
import tkinter as tk
import cv2
e = multiprocessing.Event()
p = None
# -------begin capturing and saving video
def startrecording(e,width,height,fourcc,out):
#width = 1920#window.winfo_screenwidth()
#height = 500#window.winfo_screenheight()
#fourcc = cv2.VideoWriter_fourcc(*'MJPG')
#out = cv2.VideoWriter("output.avi", fourcc, 5.0, (width,height))

while True:
img = ImageGrab.grab(bbox=(0,0,width,height))
img_np = np.array(img)
frame = cv2.cvtColor(img_np, cv2.COLOR_BGR2RGB)
#cv2.imshow('Screen', frame)
out.write(frame)
if cv2.waitKey(1) == 27:
break
def start_recording_proc(width,height,fourcc,out):
global p
p = multiprocessing.Process(target=startrecording, args=(e,width,height,fourcc,out))
p.start()
# -------end video capture and stop tk
def stoprecording(out):
e.set()
p.join()
out.release()
cv2.destroyAllWindows()

root.quit()
root.destroy()
if __name__ == "__main__":
# -------configure window
root = tk.Tk()
root.geometry("%dx%d+0+0" % (100, 100))
width = 1920#window.winfo_screenwidth()
height = 500#window.winfo_screenheight()
fourcc = cv2.VideoWriter_fourcc(*'MJPG')
out = cv2.VideoWriter("output.avi", fourcc, 5.0, (width,height))

startbutton=tk.Button(root,width=10,height=1,text='START',command= lambda: start_recording_proc(width,height,fourcc,out))
stopbutton=tk.Button(root,width=10,height=1,text='STOP', command= lambda: stoprecording(out))
startbutton.pack()
stopbutton.pack()
# -------begin
root.mainloop()

Answer 1

我将脚本保存为multiprocessing.py，这导致了错误。