Qt on maemo DBus

Hi,

I am trying to use Qt4 on maemo 4.x. (I am an absolute beginner to linux world.)

I am trying to capture event when the device goes in dimmed state. I understand we need to use DBus for it.
Following is the information I get when dbus-monitor is run on the device

Quote:

signal sender=:1.5 -> dest=(null destination) path=/com/nokia/mce/signal; interface=com.nokia.mce.signal; member=display_status_ind
string "dimmed"

based on that I am writing following code
Code:

bool success = conn.connect("com.nokia.mce.signal","/com/nokia/mce/signal","com.nokia.mce.signal", "display_status_ind",halObj, SLOT(listenInactivity(string))); qDebug() << "SUCCESS : " << success;
where halObj class is as follows
class HalObj : public QObject
{
Q_OBJECT
public:
HalObj (QObject * parent = 0);
virtual ~ HalObj() {}
public slots:
void listenInactivity(QString aStr);
};
But for some reason, my slot never gets called. Also second problem, that I am facing is that, I want to listen for this signal continuously, but it seems, I dont seem to loop by itself, I need to wrap my function call in an infinite while loop.
Here is my main.cpp
Code:

void fun() { qDebug()<<"Step1"; //Step 1 /* Register previously declared types with DBus */ qDBusRegisterMetaType<Property>(); qDBusRegisterMetaType< QList<Property> >(); qDebug()<<"Step2"; //Step 2 /* This object is used to listen for and react to events */ HalObj * halObj = new HalObj(); /* HAL stores everything on the system bus */ QDBusConnection conn = QDBusConnection::systemBus(); /* Connect to the HAL Manager device to find all devices */ QDBusInterface battery("com.nokia.bme.signal","/com/nokia/bme/signal","com.nokia.bme.signal",conn); qDebug()<<"Step5"; //Step 5 /* Listen for any â€™display_status_indâ€™ events from this battery * on DBus */ bool success = conn.connect("com.nokia.mce.signal","/com/nokia/mce/signal","com.nokia.mce.signal", "display_status_ind",halObj, SLOT(listenInactivity(string))); qDebug() << "SUCCESS : " << success; qDebug()<<"Step7"; } int main(int argc, char *argv[]) { while(1) { fun(); sleep(2); } QCoreApplication a(argc, argv); return a.exec(); }
Please let me know how to go about this problem.

Another signal I am looking for is charger connected.
The DBus monitor shows following:

Quote:

signal sender=:1.2 -> dest=(null destination) path=/com/nokia/bme/signal; interface=com.nokia.bme.signal; member=charger_connected

My question is
In the above signal,
Service is: com.nokia.bme.signal
Path is: /com/nokia/bme/signal
Interface is: com.nokia.bme.signal
Method/Signal is : charger_connected
Parameter to slot: void

Is my assumption correct?

any help would be highly appreciated

Kind Regards

Mrudul