Question

我是Python的绝对新手。

我想在应用程序启动之前检查文件是否存在。如果文件不存在，我认为应该有一个错误消息框，其中包含一个关闭应用程序的按钮。

这是我的代码

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMessageBox

from decryptwindow import Ui_Dialog  # importing our generated file

import sys
import os

class mywindow(QtWidgets.QMainWindow):
    def __init__(self):
        super(mywindow, self).__init__()
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)


ini_file = 'config.ini'
ini_file_exists = os.path.isfile(ini_file)


if ini_file_exists:
    # just for testing
    print(ini_file + ' is found')
    # let`s show the main window
    app = QtWidgets.QApplication([])
    application = mywindow()
    application.show()
    sys.exit(app.exec())
else:
    # just for testing
    print(ini_file + ' is not found') 
    app = QtWidgets.QApplication([])
    application = mywindow()
    application.show()
    error_dialog = QtWidgets.QErrorMessage()
    error_dialog.showMessage(ini_file + ' is not found')
    # after message I would like just close the application
    sys.exit(app.exec())

Answer 1

那很简单。真可惜，我在发布之前没有尝试过。

删除这两行可以解决问题

application = mywindow()
application.show()

如何通过消息框关闭Python应用程序

1 个答案: