problems with PyQt4 and all that

[AngelOfDarkness]

Hi guys,

unfortunately I am pretty new to Python and Qt and all that. Well, I managed to successfully program a little stuff for my work (computational neuroscientist. .. no comment please), using a simple graphical interface and binding it to my long existing C library. There was no problem, everything was running fine...

... until I decided to upgrade everything to kubuntu's Edgy and PyQt4. Well, I understood that I need to port my original PyQt3 stuff, as there are many principle changes in PyQt4. Anyway, I created my interfaces with Qt4 builder from Trolltech, and connected the buttons in my main Python program (that's the normal way to do, I guess?) However, this most basic "connect" does not work anymore, and I am to new to all that to understand why. Here is an example code which explains the problem:

First, the python code for the ui, generated with pyuic4:

import sys
from PyQt4 import QtCore, QtGui

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(QtCore.QSize(QtCore.QRect(0,0,400,300).size()).expandedTo(Dialog.minimumSizeHint()))

        self.buttonBox = QtGui.QDialogButtonBox(Dialog)
        self.buttonBox.setGeometry(QtCore.QRect(30,240,341,32))
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.NoButton|QtGui.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName("buttonBox")

        self.okButton = QtGui.QPushButton(Dialog)
        self.okButton.setGeometry(QtCore.QRect(70,70,80,27))
        self.okButton.setObjectName("okButton")
                
        self.retranslateUi(Dialog)
        QtCore.QObject.connect(self.buttonBox,QtCore.SIGNAL("accepted()"),Dialog.accept)
        QtCore.QObject.connect(self.buttonBox,QtCore.SIGNAL("rejected()"),Dialog.reject)
        #QtCore.QObject.connect(self.okButton,QtCore.SIGNAL("clicked()"),self.bok0)
        QtCore.QMetaObject.connectSlotsByName(Dialog)
        
    #def bok0(self):
        #print "OK !!!!!!!!"

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.okButton.setText(QtGui.QApplication.translate("Dialog", "New OK", None, QtGui.QApplication.UnicodeUTF8))

Now the main python code, which evokes the ui and tries to connect the OK button:

#!/usr/bin/env python

import sys
from PyQt4 import QtCore, QtGui
from untitled import Ui_Dialog

class TestDialog(QtGui.QDialog, Ui_Dialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)

        # Set up the user interface from Designer.
        self.setupUi(self)
        
        # Connect up the buttons.
        self.connect(self.okButton, QtCore.SIGNAL("clicked"), self.bok)

    @QtCore.pyqtSignature("")
    def bok(self):
        print "OK 2 !!!!!!!!"
                     
if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = QtGui.QDialog()
    ui = TestDialog()
    ui.setupUi(window)
    
    window.show()
    sys.exit(app.exec_())

As I said, I must make a principal mistake here, as there is no output "OK 2!!!!" on my shell when I press the button. There is also no error message or crash or whatever nasty thing, it just doesn't work. However, if I uncomment the same type of code in the ui (bok0 function), then it works. But that's not what I want.

I would very much appreciate if there is somebody who could help me in this matter. Please feel free to tell me that I am stupid as I made a stupid mistake... no hard feelings ;-)

Cheers,

Michelle
- a.k.a. Angel of Darkness -

[AngelOfDarkness]

Hi again,

OK, found an example which worked. Hmmm... still don't really know what was the point... maybe the "clicked" -> "clicked()" thing... anyway, here is a slightly stripped code which works:

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created: Thu Feb 22 15:51:35 2007
#      by: PyQt4 UI code generator 4.1.1
#
# WARNING! All changes made in this file will be lost!

import sys
from PyQt4 import QtCore, QtGui

class Ui_MainWindow(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("MainWindow")
        Dialog.resize(QtCore.QSize(QtCore.QRect(0,0,400,300).size()).expandedTo(Dialog.minimumSizeHint()))

        self.buttonBox = QtGui.QDialogButtonBox(Dialog)
        self.okButton = QtGui.QPushButton(Dialog)
        self.okButton.setGeometry(QtCore.QRect(70,70,80,27))
        self.okButton.setObjectName("okButton")
                
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)
        
    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.okButton.setText(QtGui.QApplication.translate("Dialog", "New OK", None, QtGui.QApplication.UnicodeUTF8))

And:

#!/usr/bin/env python

import sys
from PyQt4 import QtCore, QtGui
from untitled import Ui_MainWindow

class TestDialog(QtGui.QDialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)

        # Set up the user interface from Designer.
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        
        # Connect up the buttons.
        self.connect(self.ui.okButton, QtCore.SIGNAL("clicked()"), self.bok)

    def bok(self):
        print "OK 2 !!!!!!!!"
                     
if __name__ == '__main__':
    a = QtGui.QApplication(sys.argv)
    w = TestDialog()    
    w.show()
    sys.exit(a.exec_())

Sorry for bothering. Guess I should read more carefully websites ;-)

Cheers,

Michelle
- a.k.a. Angel of Darkness -

[bartonc]

Thanks for keeping us up-to-date. The input is really appreciated.