如何从 QT 窗口内停止多进程？

Posted 2023-03-30

【中文标题】如何从 QT 窗口内停止多进程？

【英文标题】：How could I stop a multiprocess from inside a QT window?

【发布时间】：2017-04-26 14:49:44

【问题描述】：

我正在尝试在我的程序中使用一些多处理，但我遇到了一个问题。 通过按下 Qt 窗口中的按钮，我启动了一个多处理，这使得这里不重要的东西。我无法通过其他按钮阻止它。到目前为止，我已经得到了这个代码：

# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys
import time
import multiprocessing


def mp_worker(a):
    for i in range(a):
        time.sleep(1)
        print('keep going :' +str(i))
    return

def Multifunc(k):
    for i in range(k):
        p = multiprocessing.Process(target= mp_worker , args=(10,))
        p.start()



class SurfViewer(QMainWindow):
    def __init__(self, parent=None):
        super(SurfViewer, self).__init__()
        self.parent = parent

        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)
        self.mainHBOX_param_scene = QHBoxLayout()

        self.Param_box = QGroupBox(" ")
        self.layout_Param_box = QVBoxLayout()
        self.Button_Threads = QPushButton('Run Threads')
        self.Button_stop = QPushButton('stop Threads')
        self.layout_Param_box.addWidget(self.Button_Threads)
        self.layout_Param_box.addWidget(self.Button_stop)
        self.Param_box.setLayout(self.layout_Param_box)

        self.mainHBOX_param_scene.addWidget(self.Param_box)
        self.centralWidget.setLayout(self.mainHBOX_param_scene)

        self.Button_Threads.clicked.connect(self.RunThreads)
        self.Button_stop.clicked.connect(self.stop)

    def RunThreads(self):
        Multifunc(10)
        return

    def stop(self):
        # How stop the multi process ?
        return


def main():
    app = QApplication(sys.argv)
    ex = SurfViewer(app)
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

所以RunThreads 函数运行多处理，stop 函数应该停止多处理，但由于 python 在我的工作人员内部，我无法从 Qt 类停止多处理。我不明白我的stopfunction 应该是什么。我应该使用某种信号来执行多处理停止吗？或者我应该将一些变量传递给Multifunc？我对此有点困惑。

【参考方案1】：

为了停止进程，您必须拥有 Process 对象，我们将对它们进行以下修改：

我们将返回进程列表

---

def Multifunc(k):
    ps = []
    for i in range(k):
        p = multiprocessing.Process(target= mp_worker , args=(10,))
        ps.append(p)
        p.start()
    return ps

我们将对象列表保存在类的属性中。

---

def RunThreads(self):
    self.ps = Multifunc(10)
    return

我们为每个进程执行终止函数：

---

def stop(self):
    # How stop the multi process ?
    for p in self.ps:
        p.terminate()

完整代码：

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys
import time
import multiprocessing


def mp_worker(a):
    for i in range(a):
        time.sleep(1)
        print('keep going :' +str(i))
    return

def Multifunc(k):
    ps = []
    for i in range(k):
        p = multiprocessing.Process(target= mp_worker , args=(10,))
        ps.append(p)
        p.start()
    return ps



class SurfViewer(QMainWindow):
    def __init__(self, parent=None):
        super(SurfViewer, self).__init__()
        self.parent = parent

        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)
        self.mainHBOX_param_scene = QHBoxLayout()

        self.Param_box = QGroupBox(" ")
        self.layout_Param_box = QVBoxLayout()
        self.Button_Threads = QPushButton('Run Threads')
        self.Button_stop = QPushButton('stop Threads')
        self.layout_Param_box.addWidget(self.Button_Threads)
        self.layout_Param_box.addWidget(self.Button_stop)
        self.Param_box.setLayout(self.layout_Param_box)

        self.mainHBOX_param_scene.addWidget(self.Param_box)
        self.centralWidget.setLayout(self.mainHBOX_param_scene)

        self.Button_Threads.clicked.connect(self.RunThreads)
        self.Button_stop.clicked.connect(self.stop)

    def RunThreads(self):
        self.ps = Multifunc(10)
        return

    def stop(self):
        # How stop the multi process ?
        for p in self.ps:
            p.terminate()


def main():
    app = QApplication(sys.argv)
    ex = SurfViewer(app)
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

【讨论】：

英俊。现在我有一个解决方案似乎很明显:) 谢谢。