[PyQt] Problem with QFileSystemWatcher

NARCISO, Rui RUI.NARCISO at airbus.com
Thu Dec 9 12:26:40 GMT 2010

Hi all

I can't seem to be able to make QFileSYstemWatcher work with a file (to see if it's contents change).
At the end of this mail you'll find a minimum example that doesn't worked.
I tried several connections with different syntaxes but nothing works.

The versions I have:
        Linux Red Hat
        PyQt 4.4.2
        Qt 4.4.0
        Python 2.5.2

Thanks for your help.

A minimum example is:
#!/usr/bin/env python

import sys
from PyQt4 import QtCore, QtGui
import codecs
import codecs
from os.path import isfile, exists

class StartQT4(QtGui.QMainWindow):
        def __init__(self, parent=None):
                QtGui.QWidget.__init__(self, parent)
                self.watcher = QtCore.QFileSystemWatcher(self)
                QtCore.QObject.connect(self.watcher,QtCore.SIGNAL("fileChanged(const QString&)"), self.file_changed)
                QtCore.QObject.connect(self.watcher,QtCore.SIGNAL("fileChanged(const QString)"), self.file_changed)
                QtCore.QObject.connect(self.watcher,QtCore.SIGNAL("fileChanged(QString)"), self.file_changed)
                QtCore.QObject.connect(self.watcher,QtCore.SIGNAL("fileChanged"), self.file_changed)
                self.filename = '/home/to96665/toto'
                if not exists:
                        print "merde"

        def file_changed(self, path):
                response = False
                # buttons texts
                SAVE = 'Save As'
                RELOAD = 'Reload File'
                CANCEL = 'Cancel'
                message = QtGui.QMessageBox(self)
                message.setText('Open file have been changed !')
                message.addButton(SAVE, QtGui.QMessageBox.AcceptRole)
                message.addButton(RELOAD, QtGui.QMessageBox.DestructiveRole)
                message.addButton(CANCEL, QtGui.QMessageBox.RejectRole)
                message.setDetailedText('The file "' + str(path) + '" have been changed or removed by other application. What do you want to do ?')
                response = message.clickedButton().text()

if __name__ == "__main__":
        app = QtGui.QApplication(sys.argv)
        myapp = StartQT4()

Data for Handling Qualities
Aerodynamics Department - EDGADY  -  M01 N368
AIRBUS Operations S.A.S.
Phone:  +33 (0)5 61 18 10 77
Fax: +33 (0)5 61 93 99 80
<Mailto:rui.narciso at airbus.com>
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