在pyqt4中退出窗口并打开另一个窗口的正确方法？

Question

我有两个窗口，（让我们把它们命名为X和Y.当X得到一个信号时，它应该自杀并运行窗口Y.

我如何尝试这样做：

• 尝试通过调用exit和stuff来退出窗口X并像菜鸟一样启动窗口Y. （得到分段错误和循环已经运行的东西）
• 尝试将同一个应用程序传递到另一个窗口，但仍然没有运气。

我的X和Y看起来像这样：

这是调用Y的X.

from PyQt4 import QtCore, QtGui
import sqlite3,hashlib,time
try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def __init__(self):
        self.server = sqlite3.connect('ems.db')
        self.cursor = self.server.cursor()
    def dummy(self,*args):
        self.close()
        #close("Kallu")

    def setupUi(self, MainWindow):
        # A button calls dummy here
        # Other boring stuff

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        #Boring

import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)

def close(user): #Routine for closing window
    app.closeAllWindows()
    app.quit()
    app.exit()
    import y #here i import Y

    y.main(app)  #Dosent works even if i pass the app as i have to run
    #app again there but it'll show already running

if __name__ == "__main__":
    MainWindow.show()
    sys.exit(app.exec_())

这是Y代码

import time
try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(746, 503)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

import sys
def main(user):
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我不需要你修改代码，而是让我明白如何去做以及为什么它有效？

Answer 1

程序不是一组文件，而是一组交互对象，因此我们的想法是两个窗口都位于同一个位置，而关闭另一个窗口则打开。另一方面，PyQt建议不要修改Qt Designer生成的类，而是创建一个继承相应小部件的新类，并使用初始类作为接口（有关更多信息，请阅读the docs）。

小.朋友

from PyQt4 import QtCore, QtGui

from y import YMainWindow

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s
try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        self.button = QtGui.QPushButton("Close")
        MainWindow.setCentralWidget(self.button)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        pass

class XMainWindow(QtGui.QMainWindow, Ui_MainWindow):
    closed = QtCore.pyqtSignal()

    def __init__(self, parent=None):
        super(XMainWindow, self).__init__(parent)
        self.setupUi(self)
        self.button.clicked.connect(self.dummy)

    @QtCore.pyqtSlot()
    def dummy(self):
        self.closed.emit()
        self.close()

import sys

def main():
    app = QtGui.QApplication.instance()
    if app is None:
        app = QtGui.QApplication(sys.argv)
    wx = XMainWindow()
    wy = YMainWindow()
    wx.closed.connect(wy.show)
    wx.show()
    return app.exec_()

if __name__ == "__main__":
    sys.exit(main())

有.朋友

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(746, 503)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        pass

class YMainWindow(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(YMainWindow, self).__init__(parent)
        self.setupUi(self)