Pyqt5 线程无法工作(致命的 Python 错误：无法获取锁定)

Question

我已经阅读了一堆qthread教程，因此可以回答。但是我无法使我的线程有效。在大多数情况下，它仅运行一次或打印错误消息。如果我在应用程序启动后立即启动线程，但是我希望该线程在某些功能之后运行，因为我想先设置目录位置。

文件结构是这样的：

App.py
Controllers/
    main_controller.py
    recorder.py
Model/
    model.py
Views/
    main_view.py

app.py

import sys
from PyQt5.QtWidgets import QApplication
from Model.model import Model
from Controllers.main_controller import MainController
from Views.main_view import MainView

class App(QApplication):
    def __init__(self, sys_argv):
        super().__init__(sys_argv)
        self.model = Model()
        self.main_controller = MainController(self.model)
        self.main_view = MainView(self.model, self.main_controller)

if __name__ == "__main__":
    app = App(sys.argv)
    sys.exit(app.exec_())

model.py

from PyQt5.QtCore import QObject

class Model(QObject):
    def __init__(self):
        super().__init__()
        self.directory = ""
    def get_directory(self):
        return self.directory
    def set_directory(self, directory):
        self.directory = directory

main_view.py

from PyQt5.QtWidgets import QMenu, QSystemTrayIcon, QMainWindow, QFileDialog
from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication
from Controllers.recorder import Recorder

class MainView(QMainWindow):
    def __init__(self, model, main_controller):
        super().__init__()
        self._model = model
        self._main_controller = main_controller
        # UI
        icon = QtGui.QIcon("icon24x24.png")
        menu = QMenu()
        start_action = menu.addAction("Start Recording")
        stop_action = menu.addAction("Stop Recording")
        self.tray = QSystemTrayIcon()
        self.tray.setIcon(icon)
        self.tray.setContextMenu(menu)
        self.tray.show()
        start_action.triggered.connect(self.start_app)
        stop_action.triggered.connect(self.stop_app)
        self.recordThread = Recorder()
    def start_app(self):
        directory = QFileDialog.getExistingDirectory(self, "Select Directory")
        self._main_controller.set_directory(directory)
        self.start_thread()
    def start_thread(self):
        self.recordThread.start()
    def stop_app(self):
        self.recordThread.terminate()
        QApplication.instance().quit()
        print("app stopped")

main_controller.py

from PyQt5.QtCore import QObject

class MainController(QObject):
    def __init__(self, model):
        super().__init__()
        self._model = model
    def set_directory(self, directory):
        self._model.set_directory(directory)

recorder.py

import time
from PyQt5.QtCore import QThread, QTimer, pyqtSignal
from Model.model import Model

class Recorder(QThread):
    job_done = pyqtSignal()
    def __init__(self):
        QThread.__init__(self)
        self._model = Model()
    def __del__(self):
        self.wait()
    def run(self):
        while True:
            print("I am the loop")
            print(self._model.get_directory())
            # time.sleep(4 - time.time() % 4)
            QThread.sleep(4)
            print("now is {}".format(time.time()))
        self.job_done.emit()

我尝试使用各种样式，包括根据各种教程，包括qthread，qobject，pyqtsignal。但是对我没有任何帮助。它要么只打印"我是循环"然后退出。或打印

I am the loop
Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads
Thread 0x00007f5d1bfff700 (most recent call first):
  File "/App/Controllers/recorder.py", line 20 in run
Current thread 0x00007f5d3458f700 (most recent call first):
Aborted

谢谢

Answer 1

您的代码没有错。该应用在调用QFileDialog.getExistingDirectory后立即关闭，因为它是QT的性质。

QT将在关闭所有窗口时退出

该应用程序关闭，因为您不再有任何窗口。您的应用程序没有任何窗口，而是QSystemTrayIcon()。将setQuitOnLastWindowClosed()设置为false解决了问题。

yourApp.setQuitOnLastWindowClosed(False)

源