Pyqt5線程無法正常工作（致命的Python錯誤：無法獲取鎖）

Question

我已經閱讀了一堆QThread教程和SO Answers。 但是我無法使線程工作。 大多數情況下，它只運行一次或打印錯誤消息。 如果我在應用程序啟動后立即啟動線程，則可以正常工作，但是我希望線程在某些功能后運行，因為我想先設置目錄位置。

文件結構的排列如下：

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()

根據各種教程，我嘗試使用各種樣式，包括Qthread，QObject，pyqtsignal。 但對我沒有任何作用。 它要么只是打印“我就是循環”，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

謝謝

Answer 1

您的代碼沒有錯。 調用QFileDialog.getExistingDirectory后，應用立即關閉，因為這是Qt的本質。

關閉所有Windows時退出Qt

該應用已關閉，因為您不再有任何窗口。 您的應用程序沒有任何窗口，但QSystemTrayIcon() 。 將setQuitOnLastWindowClosed()設置為False可以解決此問題。

yourApp.setQuitOnLastWindowClosed(False)

資源