Python 结束GUI在退出时启动的所有进程（守护进程=True不工作）

当用户结束主程序UI时，如何确保所有进程都关闭？我已尝试将进程设置为

daemon=True

，但这不起作用。我看到其他线程表示，您应该使用一个信号，并不断检查是否发出了“退出”信号，但这对我来说没有意义，因为如果GUI现在不存在，GUI代码将不再执行

在这种情况下，流程如何知道GUI是否消失了：（其中执行

sys.exit（app.exec_389;（））

）

---

找到了答案。您可以在

QWidget

对象中重新定义

closeEvent

函数。像这样：

def closeEvent(self, event):
    for p in self.processlist:
        p.terminate()

以下是更新的代码段：

from PyQt4 import QtCore, QtGui
import multiprocessing as mp
import sys
import time

def f(data):
    for i in range(0,10**5):
        data[0] += 1
        time.sleep(.1)

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent = None):
        QtGui.QMainWindow.__init__(self)
        self.centralwidget = QtGui.QWidget(self)
        self.top_level_layout = QtGui.QGridLayout(self.centralwidget)
        self.setCentralWidget(self.centralwidget)
        self.centralwidget.setLayout(self.top_level_layout)
        self.process_button = QtGui.QPushButton("Start Process")
        self.top_level_layout.addWidget(self.process_button, 0, 0)
        QtCore.QObject.connect(self.process_button, QtCore.SIGNAL("clicked()"), self.start_process)

        self.processlist = list()
        self.manager = mp.Manager()
        self.data = self.manager.list([1])
        for i in range(0, 10):
            self.processlist.append(mp.Process(target=f, args=(self.data,)))
            self.processlist[-1].daemon = True

    def closeEvent(self, event):
        for p in self.processlist:
            p.terminate()

    def start_process(self):
        for p in self.processlist:
            p.start()

if __name__ == "__main__":
    app = QtGui.QApplication([])
    win = MainWindow()
    win.show()
    sys.exit(app.exec_())

from PyQt4 import QtCore, QtGui
import multiprocessing as mp
import sys
import time

def f(data):
    for i in range(0,10**5):
        data[0] += 1
        time.sleep(.1)

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent = None):
        QtGui.QMainWindow.__init__(self)
        self.centralwidget = QtGui.QWidget(self)
        self.top_level_layout = QtGui.QGridLayout(self.centralwidget)
        self.setCentralWidget(self.centralwidget)
        self.centralwidget.setLayout(self.top_level_layout)
        self.process_button = QtGui.QPushButton("Start Process")
        self.top_level_layout.addWidget(self.process_button, 0, 0)
        QtCore.QObject.connect(self.process_button, QtCore.SIGNAL("clicked()"), self.start_process)

        self.processlist = list()
        self.manager = mp.Manager()
        self.data = self.manager.list([1])
        for i in range(0, 10):
            self.processlist.append(mp.Process(target=f, args=(self.data,)))
            self.processlist[-1].daemon = True

    def closeEvent(self, event):
        for p in self.processlist:
            p.terminate()

    def start_process(self):
        for p in self.processlist:
            p.start()

if __name__ == "__main__":
    app = QtGui.QApplication([])
    win = MainWindow()
    win.show()
    sys.exit(app.exec_())