How to listen to System clock changes CLOCKD_TIME_CHANGED using Qt ?

[mismael]

hi there;
I was trying to create a Qt application that can listen to System clock changes (i.e a user has adjusted the system clock). I found a DBus signal in libtime.h called CLOCKD_TIME_CHANGED , this signal -as described by the documentation - is sent when the time settings das been changed
I used dbus-monitor --system to verfiy if it is emitted when I change system clock and i found the following :

signal sender=:1.28 -> dest=(null destination) serial=455 path=/com/nokia/time; interface=com.nokia.time; member=changed
   int64 403039731056640
signal sender=:1.28 -> dest=(null destination) serial=456 path=/com/nokia/clockd; interface=com.nokia.clockd; member=time_changed
   int32 0
signal sender=:1.28 -> dest=(null destination) serial=467 path=/com/nokia/time; interface=com.nokia.time; member=changed
   int64 0
signal sender=:1.28 -> dest=(null destination) serial=468 path=/com/nokia/clockd; interface=com.nokia.clockd; member=time_changed
   int32 0
signal sender=:1.28 -> dest=(null destination) serial=502 path=/com/nokia/time; interface=com.nokia.time; member=changed
   int64 503937102774272
signal sender=:1.28 -> dest=(null destination) serial=503 path=/com/nokia/clockd; interface=com.nokia.clockd; member=time_changed
   int32 0
signal sender=:1.28 -> dest=(null destination) serial=513 path=/com/nokia/time; interface=com.nokia.time; member=changed
   int64 1265145480
signal sender=:1.28 -> dest=(null destination) serial=514 path=/com/nokia/clockd; interface=com.nokia.clockd; member=time_changed
   int32 1265145480
signal sender=:1.38 -> dest=(null destination) serial=54 path=/com/nokia/alarmd; interface=com.nokia.alarmd; member=queue_status_ind
   int32 0
   int32 2147483647
   int32 2147483647
   int32 1265200040
signal sender=:1.38 -> dest=(null destination) serial=55 path=/com/nokia/alarmd; interface=com.nokia.alarmd; member=time_change_ind

Everything is OK so far,
But the problem is when I try to connect to it uding QT-dbus
the connect statement always returns false and the slot I created to handle the change is never called.
I don't know where the problem is
My .pro file has the following added to it:

INCLUDEPATH += /usr/include/clockd /usr/include/dbus-1.0 usr/lib/dbus-1.0/include
LIBS += -ldbus-glib-1 -ldbus-1

in my code :

#include "/usr/include/clockd/libtime.h"
#include <time.h>
#include <QDebug>
#include <QDBusConnection>
#include <QDBusInterface>
#include <QObject>
QDBusConnection m_pConnection = QDBusConnection::systemBus();
QDBusInterface* Clock_interface = new QDBusInterface(CLOCKD_SERVICE, CLOCKD_PATH,
			  CLOCKD_INTERFACE, m_pConnection);
//QDBusMessage replay = clock_interface
if(QObject::connect(Clock_interface,SIGNAL(CLOCKD_TIME_CHANGED),this,SLOT(handleTimeChanged())) )qDebug(" managed to connect to dbus signal !!!!");
    else 
	qDebug("NOT CONNECTED!!!");

the program compiles and when it runs, it
tells me there are missing parantheses. So, I tried the connect signal another way

if(QObject::connect(Clock_interface,SIGNAL(CLOCKD_TIME_CHANGED(int)),this,SLOT(handleTimeChanged(int)))

at runtime, it tells me
Object::connect: No such signal com::nokia::clockd::CLOCKD_TIME_CHANGED(int)
I don't know where I went worng. I am not sure i am doing the right thing at the first place!
Could anybody tell me what to do to make my QT app listen to the CLOCKD_TIME_CHANGED signal???
thanks in advance

[divanov]

The correct way to do it is to use QDBusConnection::connect() instead of QObject::connect().
Also you don't need glib dbus and dbus includes and libs. Instead you have to add

QT += dbus

to your project file.