python - 如何从 GUI 停止 QThread

这是我之前发布的上一个问题的后续问题。
问题是如何在使用不继承 Qthread 的推荐方法时从 GUI 停止(终止|退出|退出)QThread，而是创建 QObject 然后将其移动到 QThread。下面是一个工作示例。我可以启动 GUI 和 Qthread，我可以让后者更新 GUI。然而，我无法阻止它。我为 qthread 尝试了几种方法(quit()、exit()，甚至 terminate())都无济于事。
非常感谢帮助。

这是完整的代码:

import time, sys
from PyQt4.QtCore  import *
from PyQt4.QtGui import *

class SimulRunner(QObject):
    'Object managing the simulation'

    stepIncreased = pyqtSignal(int, name = 'stepIncreased')
    def __init__(self):
        super(SimulRunner, self).__init__()
        self._step = 0
        self._isRunning = True
        self._maxSteps = 20

    def longRunning(self):
        while self._step  < self._maxSteps  and self._isRunning == True:
            self._step += 1
            self.stepIncreased.emit(self._step)
            time.sleep(0.1)

    def stop(self):
        self._isRunning = False

class SimulationUi(QDialog):
    'PyQt interface'

    def __init__(self):
        super(SimulationUi, self).__init__()

        self.goButton = QPushButton('Go')
        self.stopButton = QPushButton('Stop')
        self.currentStep = QSpinBox()

        self.layout = QHBoxLayout()
        self.layout.addWidget(self.goButton)
        self.layout.addWidget(self.stopButton)
        self.layout.addWidget(self.currentStep)
        self.setLayout(self.layout)

        self.simulRunner = SimulRunner()
        self.simulThread = QThread()
        self.simulRunner.moveToThread(self.simulThread)
        self.simulRunner.stepIncreased.connect(self.currentStep.setValue)


        self.stopButton.clicked.connect(simulThread.qui)  # also tried exit() and terminate()
        # also tried the following (didn't work)
        # self.stopButton.clicked.connect(self.simulRunner.stop)
        self.goButton.clicked.connect(self.simulThread.start)
        self.simulThread.started.connect(self.simulRunner.longRunning)
        self.simulRunner.stepIncreased.connect(self.current.step.setValue)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    simul = SimulationUi()
    simul.show()
    sys.exit(app.exec_())

最佳答案

我很久以前就知道了，但我只是偶然发现了同样的问题。

我也一直在寻找一种合适的方法来做到这一点。最后很容易。退出应用程序时，需要停止任务，并且需要停止调用其退出方法的线程。请参阅底部的 stop_thread 方法。你需要等待线程完成。否则，您将在退出时收到 QThread: Destroyed while thread is still running' 消息。

(我也把我的代码改成使用pyside)

import time, sys
from PySide.QtCore  import *
from PySide.QtGui import *

class Worker(QObject):
    'Object managing the simulation'

    stepIncreased = Signal(int)

    def __init__(self):
        super(Worker, self).__init__()
        self._step = 0
        self._isRunning = True
        self._maxSteps = 20

    def task(self):
        if not self._isRunning:
            self._isRunning = True
            self._step = 0

        while self._step  < self._maxSteps  and self._isRunning == True:
            self._step += 1
            self.stepIncreased.emit(self._step)
            time.sleep(0.1)

        print "finished..."

    def stop(self):
        self._isRunning = False


class SimulationUi(QDialog):
    def __init__(self):
        super(SimulationUi, self).__init__()

        self.btnStart = QPushButton('Start')
        self.btnStop = QPushButton('Stop')
        self.currentStep = QSpinBox()

        self.layout = QHBoxLayout()
        self.layout.addWidget(self.btnStart)
        self.layout.addWidget(self.btnStop)
        self.layout.addWidget(self.currentStep)
        self.setLayout(self.layout)

        self.thread = QThread()
        self.thread.start()

        self.worker = Worker()
        self.worker.moveToThread(self.thread)
        self.worker.stepIncreased.connect(self.currentStep.setValue)

        self.btnStop.clicked.connect(lambda: self.worker.stop())
        self.btnStart.clicked.connect(self.worker.task)

        self.finished.connect(self.stop_thread)

    def stop_thread(self):
        self.worker.stop()
        self.thread.quit()
        self.thread.wait()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    simul = SimulationUi()
    simul.show()
    sys.exit(app.exec_())

关于python - 如何从 GUI 停止 QThread，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16246796/