如何在不关闭 GUI 窗口的情况下停止运行 PyQt5 程序? [英] How to stop running PyQt5 program without closing the GUI window?

问题描述

以下代码 ping 一个网站并在 QTextEdit 中打印结果.一键运行"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 有任何想法，以便我可以通过按运行"按钮再次启动 ping.

The following code pings a website and prints the result in QTextEdit. One button "Run" is used to start the ping. I want to have another button "End", which could stop the ping process while it is running without closing the GUI. But currently, the "End" button closes the whole GUI window. Do you have any thoughts on how to stop the ping but keep the GUI, so I can start the ping again by pressing the "Run" button.

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() 

推荐答案

您必须将 clicked 信号与 QProcess kill 槽:

You must connect the clicked signal with the QProcess kill slot:

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))

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