python之如何在不关闭 GUI 窗口的情况下停止运行 PyQt5 程序

以下代码对网站执行 ping 操作并在 QTextEdit 中打印结果。一个按钮“运行”用于启动 ping。我想要另一个按钮“结束”，它可以在不关闭 GUI 的情况下在运行时停止 ping 过程。但目前，“结束”按钮会关闭整个 GUI 窗口。您对如何停止 ping 但保留 GUI 有什么想法吗，这样我就可以通过按“运行”按钮再次启动 ping。

import sys 
from PyQt5 import QtCore,QtWidgets 
 
class gui(QtWidgets.QMainWindow): 
    def __init__(self): 
        super(gui, self).__init__() 
        self.initUI() 
 
    def dataReady(self): 
        cursor = self.output.textCursor() 
        cursor.movePosition(cursor.End) 
        cursor.insertText(str(self.process.readAll())) 
        self.output.ensureCursorVisible() 
 
    def callProgram(self): 
        # run the process 
        # `start` takes the exec and a list of arguments 
        self.process.start('ping',['127.0.0.1']) 
 
    def initUI(self): 
        # Layout are better for placing widgets 
        layout = QtWidgets.QHBoxLayout() 
        self.runButton = QtWidgets.QPushButton('Run') 
        self.runButton.clicked.connect(self.callProgram) 
        self.runButton1 = QtWidgets.QPushButton('End') 
        self.runButton1.clicked.connect(self.close) 
 
        self.output = QtWidgets.QTextEdit() 
 
        layout.addWidget(self.output) 
        layout.addWidget(self.runButton) 
        layout.addWidget(self.runButton1) 
 
        centralWidget = QtWidgets.QWidget() 
        centralWidget.setLayout(layout) 
        self.setCentralWidget(centralWidget) 
 
        # QProcess object for external app 
        self.process = QtCore.QProcess(self) 
        # QProcess emits `readyRead` when there is data to be read 
        self.process.readyRead.connect(self.dataReady) 
 
        # Just to prevent accidentally running multiple times 
        # Disable the button when process starts, and enable it when it finishes 
        self.process.started.connect(lambda: self.runButton.setEnabled(False)) 
        self.process.finished.connect(lambda: self.runButton.setEnabled(True)) 
 
 
#Function Main Start 
def main(): 
    app = QtWidgets.QApplication(sys.argv) 
    ui=gui() 
    ui.show() 
    sys.exit(app.exec_()) 
#Function Main END 
 
if __name__ == '__main__': 
    main()  

请您参考如下方法:

您必须将 clicked 信号与 QProcess 连接 kill插槽:

def initUI(self): 
    [...] 
    self.runButton1 = QtWidgets.QPushButton('End') 
    # self.runButton1.clicked.connect(self.close) 
    [...] 
 
    # QProcess object for external app 
    self.process = QtCore.QProcess(self) 
    # QProcess emits `readyRead` when there is data to be read 
    self.process.readyRead.connect(self.dataReady) 
    self.runButton1.clicked.connect(self.process.kill) 
    # Just to prevent accidentally running multiple times 
    # Disable the button when process starts, and enable it when it finishes 
    self.process.started.connect(lambda: self.runButton.setEnabled(False)) 
    self.process.finished.connect(lambda: self.runButton.setEnabled(True))