Python 计时器线程不使用桌面快捷方式终止 [英] Python Timer Threading not Terminating using Desktop Shortcut
问题描述
当我从终端运行以下代码并退出窗口后,使用 Ctrl+C 或 Ctrl+Z 取消脚本时,脚本完全终止.使用 Ctrl+C 我得到这个错误:
When I run the following code from the terminal and after exiting the window, use either Ctrl+C or Ctrl+Z to cancel the script, the script COMPLETELY terminates. With Ctrl+C I get this error:
Exception ignored in: <module 'threading' from '/usr/lib/python3.6/threading.py'>
Traceback (most recent call last):
File "/usr/lib/python3.6/threading.py", line 1294, in _shutdown
t.join()
File "/usr/lib/python3.6/threading.py", line 1056, in join
self._wait_for_tstate_lock()
File "/usr/lib/python3.6/threading.py", line 1072, in _wait_for_tstate_lock
elif lock.acquire(block, timeout):
KeyboardInterrupt
如果我使用桌面链接:
#!/usr/bin/env xdg-open
[Desktop Entry]
Type=Application
Name=MyProblem
Exec=/home/USER/myProblem.py
Terminal=false
Name[en_CA]=myProblem
并退出窗口,线程似乎仍在运行(通过尝试注销我的桌面并出现一个通知程序,表明 MyProblem 正忙).
and exit the window, it appears that the thread is still running (indicated by trying to log off my desktop and a notifier appearing saying that MyProblem is busy).
线程代码没有终止,据我所知,在等待期后触发线程后,很难终止.我看了很多帖子,包括:Python threading.timer - 每 'n' 秒重复一次函数Python线程,线程不关闭
The threading code is not terminating and I understand that after threading has been triggered after the waiting period, it is difficult to terminate. I'v looked at numerous posts including: Python threading.timer - repeat function every 'n' seconds Python threading, threads do not close
由于这是一个 threading.Timer,似乎没有使用 daemon=True 的方法.
Since this is a threading.Timer, there does not appear to be a way of using daemon=True.
我不确定如何在离开窗口之前在 closeEvent 中实现线程的完全关闭.每个人都保持安全.谢谢.
I am not sure how to implement a complete shutdown of threading in the closeEvent before leaving the window. Everyone stay safe. Thank you.
#!/usr/bin/python3
from datetime import datetime, timedelta
from PyQt5.QtWidgets import (QAction, QApplication, QCheckBox, QGridLayout, QMainWindow, QMenuBar, QWidget)
import os; import subprocess; import sys; import threading; import time
class MyProblem(QMainWindow):
def __init__(self):
super().__init__()
self.initUI()
########################################
def closeEvent(self, event):
# what do I place here - thr is a NoneType
None
########################################
def recordTimedAudio(self, tL, tfn):
# record audio
self.rec_args =['arecord', '--device=hw', '-d', str(tL), '-f', 'cd', '-t', 'wav', tfn +'.wav']
self.rec = subprocess.Popen(self.rec_args, shell=False)
########################################
def timedRecording(self):
dateData =['2020-04-13 13:06:00','2020-04-13 13:07:00'] # this should be changed for future dates/times
# My code uses a for loop to create a number of threads, but the end go through a series
for d in dateData:
# Create Start Time in Seconds
t = time.strptime(d, '%Y-%m-%d %H:%M:%S')
t = time.mktime(t)
thr = threading.Timer(int(t-time.time()), self.recordTimedAudio, ['10','File1']).start() #/27190809/
print(thr) # This comes back None
self.timerAction.setEnabled(False)
########################################
def initUI(self):
self.setGeometry(5,5,100,100); self.mainWidget = QWidget()
self.layout = QGridLayout(); self.mainWidget.setLayout(self.layout)
self.setCentralWidget(self.mainWidget)
# Menu
self.mainMenu = self.menuBar()
self.optionsMenu = self.mainMenu.addMenu('Options')
self.timerAction = QAction('Set Timer', checkable=True)
self.timerAction.triggered.connect(self.timedRecording)
self.optionsMenu.addAction(self.timerAction)
self.show()
########################################
if __name__ =='__main__':
app = QApplication(sys.argv)
ex = MyProblem()
sys.exit(app.exec_())
################################################################################################END
推荐答案
我无法停止线程,也许线程对于这样的计时问题来说太过分了.我创建了一个解决方法,可能会在未来帮助某人.用这些例程替换上面的代码:
I couldn't get the thread to stop and maybe threading was overkill for such a timing problem. I created a workaround that may help someone in the future. Replace the above code with these routines:
def timedRecording(self):
dateData =['2020-04-13 13:06:00','2020-04-13 13:07:00'] # this should be changed for future dates/times
for d in dateData:
# Create Start Time in Seconds
t = time.strptime(d, '%Y-%m-%d %H:%M:%S')
t = time.mktime(t)
self.timerData.append([t, trecLength, urlText, tfilename]) # start time recording length, url, filename
self.timerData.sort(key = lambda x: x[0]) # /4174941/
self.treclen = len(self.timerData)
if self.treclen>0:
self.rtime.setText('Timer Set')
self.timerAction.setEnabled(False)
self.startTRecTimer()
########################################
def recordTimedAudio(self, tL, urlText, tfn):
self.rec_args =['arecord', '--device=hw', '-d', str(tL), '-f', 'cd', '-t', 'wav', os.path.join(os.path.sep,self.audioDir, tfn +'.wav')]
self.rec = subprocess.Popen(self.rec_args, shell=False) #https://docs.python.org/2/library/subprocess.html#popen-constructor
# Learning a trick from: https://stackoverflow.com/questions/27190809/
if self.trecNum < self.treclen-1:
self.trecNum+=1
self.startTRecTimer()
########################################
def startTRecTimer(self):
if time.time() < self.timerData[self.trecNum][0]: # time has not elapsed /415511/
# Start QTimer delay then Start Recording
delayTime = int(self.timerData[self.trecNum][0]-time.time())*1000 # QTimer uses milliseconds
self.trecTimer = QTimer()
self.trecTimer.setSingleShot(True)
self.trecTimer.timeout.connect(lambda: self.recordTimedAudio(self.timerData[self.trecNum][1], self.timerData[self.trecNum][2], self.timerData[self.trecNum][3]))
self.trecTimer.start(delayTime)
还添加到 initUI:
Also add to initUI:
self.rec = None
窗口的closeEvent:
And to the closeEvent of the window:
if self.rec != None:
self.rec.terminate() # /16866602/
所以子进程停止了.
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