Question

我正在尝试在我的程序中使用一些多处理，而我正面临一个问题。我通过在Qt窗口中按下按钮来启动多处理，这使得一些不重要的事情发生。我无法从其他按钮停止它。到目前为止，我已经有了这段代码：

# -*- 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()

因此RunThreads函数运行多处理，stop函数应停止多处理，但由于python在我的worker中，我无法停止Qt类的多处理。我不明白我的stop功能应该是什么。我应该使用SIGNAL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。

Answer 1

为了停止进程，您必须拥有Process对象，对于它们，我们将进行以下修改：

我们将返回Process

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terminate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()

如何在QT窗口内停止多进程？

1 个答案: