[英]How to stop running PyQt5 program without closing the GUI window?
The following code pings a website and prints the result in QTextEdit.以下代码 ping 一个网站并在 QTextEdit 中打印结果。 One button "Run" is used to start the ping.
一键“运行”用于启动ping。 I want to have another button "End", which could stop the ping process while it is running without closing the GUI.
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。 But currently, the "End" button closes the whole GUI window.
但目前,“结束”按钮会关闭整个 GUI 窗口。 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.
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。
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()
You must connect the clicked
signal with the QProcess
kill
slot:您必须连接
clicked
与信号QProcess
kill
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))
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