PyQt5中如何设置关闭子进程的槽函数

可以通过使用QProcess类来创建一个子进程，然后在该子进程完成后调用其finished()信号来关闭子进程。具体实现如下：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QPlainTextEdit

class MyMainWindow(QMainWindow):
	def __init__(self, parent=None):
		super(MyMainWindow, self).__init__(parent)
		self.centralWidget = QWidget()
		self.setCentralWidget(self.centralWidget)
		self.layout = QVBoxLayout()
		self.centralWidget.setLayout(self.layout)
		self.textEdit = QPlainTextEdit()
		self.layout.addWidget(self.textEdit)
		self.button = QPushButton('Start Process')
		self.layout.addWidget(self.button)
		self.process = QProcess(self)
		self.button.clicked.connect(self.startProcess)
		self.process.finished.connect(self.processFinished)

	def startProcess(self):
		command = 'echo test'
		self.process.start(command)

	def processFinished(self):
		self.textEdit.appendPlainText('Process finished!')

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

在上述代码中，我们创建了一个子进程，并通过按钮调用startProcess()函数来启动该子进程。在该函数中，我们将要执行的命令传递给QProcess类的start()函数来启动子进程。同时，我们还将子进程的finished()信号与其对应的槽函数processFinished()连接起来。当子进程执行完毕后，就会发出finished()信号并调用processFinished()函数来关闭子进程。