Version:            (using KDE 4.2.0)
Compiler:          Python 2.6 and gcc 4.3.3 
OS:                Linux
Installed from:    Unlisted Binary Package

The following pykde program try to connect KWindowSystem::activeWindowChange(WId) to a Python function. But it failed - there's no exception raised when running, but the Python is not triggered when window focus changed. Even more strange, QObject.connect doesn't raise any exception when a non exist signal passed in (for example SIGNAL("balbal()"), is that the normal behavior of connect()?

I'm using Archlinux, the version of PyQt is 4.4.4, sip is 4.7.9.


import sys
from PyQt4.QtCore import SIGNAL, SLOT, pyqtSignature, QObject
from PyQt4.QtGui import QApplication, QMainWindow
from PyKDE4.kdecore import ki18n, KAboutData, KCmdLineArgs
from PyKDE4.kdeui import KApplication, KMainWindow, KWindowSystem

class FocusListener(KMainWindow):
    def __init__(self):
        KMainWindow.__init__(self)
        kwin = KWindowSystem.self()
        QObject.connect(kwin, SIGNAL("activeWindowChanged(WId)"), self.printChange)

    @pyqtSignature("int")
    def printChange(self, wid):
        print "Focus changed to", wid



def get_about():
    appName     = "TestKApplication"
    catalog     = "Test"
    programName = ki18n ("TestKApplication")
    version     = "1.0"
    description = ki18n ("Test KApplication")
    license     = KAboutData.License_GPL
    copyright   = ki18n ("(c) 2009 Haoyu Bai")
    text        = ki18n ("none")
    homePage    = "http://localhost"
    bugEmail    = "baihaoyu@gmail.com"
     
    aboutData   = KAboutData (appName, catalog, programName, version, 
                description, license, copyright, text, homePage, bugEmail)
    return aboutData

def main():
    aboutData = get_about()
    KCmdLineArgs.init(sys.argv, aboutData)
    app = KApplication()
    listener = FocusListener()
    listener.show()
    app.exec_()

if __name__=="__main__":
    main()