Question

我前段时间制作了一个脚本来记录用户的监视器帧，现在我正在尝试为它创建一个GUI。目前它只有一个START和STOP按钮，但STOP按钮不会停止录制。我怎么能改变我的stop_thread函数才能工作？我应该首先终止工作人员然后终止线程吗？我怎么能终止工人呢？谢谢你的帮助！

import sys
from PyQt5.QtWidgets import (QWidget,
                             QPushButton, QApplication, QGridLayout)
from PyQt5.QtCore import QThread, QObject


class Worker(QObject):

    def __init__(self, parent=None):
        QObject.__init__(self, parent=parent)

    def do_work(self):
        i = 1
        while True:
            print(i)
            QThread.sleep(1)
            i = i + 1

    def stop(self):
        print("stopped")
        self.deleteLater() # How do I stop it?


class Gui(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):

        # Buttons:
        self.btn_start = QPushButton('Start')
        self.btn_start.resize(self.btn_start.sizeHint())
        self.btn_start.move(50, 50)
        self.btn_stop = QPushButton('Stop')
        self.btn_stop.resize(self.btn_stop.sizeHint())
        self.btn_stop.move(150, 50)

        # GUI title, size, etc...
        self.setGeometry(300, 300, 300, 220)
        self.setWindowTitle('ThreadTest')
        self.layout = QGridLayout()
        self.layout.addWidget(self.btn_start, 0, 0)
        self.layout.addWidget(self.btn_stop, 0, 50)
        self.setLayout(self.layout)

        # Thread:
        self.thread = QThread()
        self.worker = Worker()
        self.worker.moveToThread(self.thread)

        self.thread.started.connect(self.worker.do_work) # when thread starts, start worker
        self.thread.finished.connect(self.worker.stop) # when thread finishes, stop worker

        # Start Button action:
        self.btn_start.clicked.connect(self.thread.start)

        # Stop Button action:
        self.btn_stop.clicked.connect(self.stop_thread)

        self.show()

    # When stop_btn is clicked this runs. Terminates the worker and the thread.
    def stop_thread(self):
        print("It should stop printing numbers now and not crash")
        self.worker.disconnect()
        self.thread.terminate()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    gui = Gui()
    sys.exit(app.exec_())

编辑：虽然MalloyDelacroix的答案已经工作了一段时间，但我现在遇到了一个问题：如果来自do_work的{{1}}是导入的函数，它会永远循环，我可以点击一下按钮来阻止它吗？我想强行关闭它。来自test import s_main

Worker

test.py：

class Worker(QObject):

finished = pyqtSignal()  # give worker class a finished signal

def __init__(self, parent=None):
    QObject.__init__(self, parent=parent)
    self.continue_run = True  # provide a bool run condition for the class

def do_work(self):

    s_main()

    self.finished.emit()  # emit the finished signal when the loop is done

def stop(self):
    self.continue_run = False  # set the run condition to false on stop

Answer 1

以下是您发布的代码的工作示例。我已经在我改变的领域做了评论，并解释了原因。

<select>

修改

答案仍然基本相同，你只需要将停止按钮连接到其他方法运行条件。

test.py

import sys from PyQt5.QtWidgets import (QWidget, QPushButton, QApplication, QGridLayout) from PyQt5.QtCore import QThread, QObject, pyqtSignal class Worker(QObject): finished = pyqtSignal() # give worker class a finished signal def __init__(self, parent=None): QObject.__init__(self, parent=parent) self.continue_run = True # provide a bool run condition for the class def do_work(self): i = 1 while self.continue_run: # give the loop a stoppable condition print(i) QThread.sleep(1) i = i + 1 self.finished.emit() # emit the finished signal when the loop is done def stop(self): self.continue_run = False # set the run condition to false on stop class Gui(QWidget): stop_signal = pyqtSignal() # make a stop signal to communicate with the worker in another thread def __init__(self): super().__init__() self.initUI() def initUI(self): # Buttons: self.btn_start = QPushButton('Start') self.btn_start.resize(self.btn_start.sizeHint()) self.btn_start.move(50, 50) self.btn_stop = QPushButton('Stop') self.btn_stop.resize(self.btn_stop.sizeHint()) self.btn_stop.move(150, 50) # GUI title, size, etc... self.setGeometry(300, 300, 300, 220) self.setWindowTitle('ThreadTest') self.layout = QGridLayout() self.layout.addWidget(self.btn_start, 0, 0) self.layout.addWidget(self.btn_stop, 0, 50) self.setLayout(self.layout) # Thread: self.thread = QThread() self.worker = Worker() self.stop_signal.connect(self.worker.stop) # connect stop signal to worker stop method self.worker.moveToThread(self.thread) self.worker.finished.connect(self.thread.quit) # connect the workers finished signal to stop thread self.worker.finished.connect(self.worker.deleteLater) # connect the workers finished signal to clean up worker self.thread.finished.connect(self.thread.deleteLater) # connect threads finished signal to clean up thread self.thread.started.connect(self.worker.do_work) self.thread.finished.connect(self.worker.stop) # Start Button action: self.btn_start.clicked.connect(self.thread.start) # Stop Button action: self.btn_stop.clicked.connect(self.stop_thread) self.show() # When stop_btn is clicked this runs. Terminates the worker and the thread. def stop_thread(self): self.stop_signal.emit() # emit the finished signal on stop if __name__ == '__main__': app = QApplication(sys.argv) gui = Gui() sys.exit(app.exec_())

worker.py

import time run = True def s_main(): x = 1 while run: print(x) x += 1 time.sleep(1)

如何使用PyQt5运行“While循环”？

1 个答案: