python - 如何在不关闭 GUI 窗口的情况下停止运行 PyQt5 程序？

Question

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() 

Answer 1

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))