PyQt 对话框 - 如何在按下按钮后退出? [英] PyQt dialog - How to make it quit after pressing a button?

问题描述

好吧，我正在编写一个小型 PyQt4 应用程序，它只是一个是/否对话框，它必须执行外部命令(例如eject/dev/sr0")并退出.

Well, I'm writing a small PyQt4 app, it's just a single Yes/No dialog which has to execute an external command (e.g. 'eject /dev/sr0') and quit.

应用程序运行，它在按下是"按钮后执行命令，但在执行命令时我无法让对话框本身退出.

The app runs, it executes the command after pressing the "Yes" button, but I cannot make the dialog itself exit when executing the command.

#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys
import os
import subprocess
from PyQt4 import QtGui
from PyQt4 import QtCore
from subprocess import call
cmd = 'eject /dev/sr0'

class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        btn = QtGui.QPushButton('Yes', self)     
        btn.clicked.connect(lambda: os.system(cmd))
        btn.resize(180, 40)
        btn.move(20, 35)       

        qbtn = QtGui.QPushButton('No', self)
        qbtn.clicked.connect(QtCore.QCoreApplication.instance().quit)
        qbtn.resize(180, 40)
        qbtn.move(20, 80) 

        self.setWindowTitle('Test')    
        self.show()

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

这是我的代码.当我单击是"时，它会正确调用eject/dev/sr0"命令，但此后对话框仍然可见.我必须单击否"关闭应用程序，我希望它在执行命令时自动关闭.我应该添加/修改什么?

Here is my code. When I click "Yes", it calls the 'eject /dev/sr0' command properly, but after that the dialog is still visible. I have to click "No" to close the app I would like it to close automatically when the command is executed. What should I add/modify?

推荐答案

将 lambda: os.system(cmd) 替换为具有多个语句的函数/方法.

Replace lambda: os.system(cmd) with a function/method that has multiple statements.

def buttonClicked(self):
    os.system(cmd)
    QtCore.QCoreApplication.instance().quit()

...
    btn = QtGui.QPushButton('Yes', self)     
    btn.clicked.connect(self.buttonClicked)
...

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