qt4 - How to call one mainwindow to another mainwindow in Qt (or PyQt) -

in project have created 2 mainwindow want call mainwindow2 mainwindow1 (which in running). in mainwindow1 used app.exec_() (pyqt) , show maindow2 using maindow2.show() in click event of button not show anything

calling mainwindow2.show() should work you. give more complete example of code? there may wrong somewhere else.

edit: code updated show example of how hide , show windows when opening , closing other windows.

from pyqt4.qtgui import qapplication, qmainwindow, qpushbutton, \             qlabel, qvboxlayout, qwidget pyqt4.qtcore import pyqtsignal  class mainwindow1(qmainwindow):     def __init__(self, parent=none):         qmainwindow.__init__(self, parent)          button = qpushbutton('test')         button.clicked.connect(self.newwindow)         label = qlabel('mainwindow1')          centralwidget = qwidget()         vbox = qvboxlayout(centralwidget)         vbox.addwidget(label)         vbox.addwidget(button)         self.setcentralwidget(centralwidget)      def newwindow(self):         self.mainwindow2 = mainwindow2(self)         self.mainwindow2.closed.connect(self.show)         self.mainwindow2.show()         self.hide()  class mainwindow2(qmainwindow):      # qmainwindow doesn't have closed signal, we'll make one.     closed = pyqtsignal()      def __init__(self, parent=none):         qmainwindow.__init__(self, parent)         self.parent = parent         label = qlabel('mainwindow2', self)      def closeevent(self, event):         self.closed.emit()         event.accept()  def startmain():     app = qapplication(sys.argv)     mainwindow1 = mainwindow1()     mainwindow1.show()     sys.exit(app.exec_())  if __name__ == "__main__":     import sys     startmain()