Connecting dbus signal iwth Qt Apps

[yuvaraj.addu]

Hi All,

I want to connect dbus signal with my Qt Apps.

Tried with below mentioned piece of code

example::example(const QString &service, const QString &path, const char *interface,const QDBusConnection &connection,QObject *parent):QDBusAbstractInterface(service, path, interface,connection,parent)
 {
 
  bool val= this->connection().connect(service,path,QString("/myInterface),QString("PropertyChanged"),QString("QString,QDBusVariant"),this,SLOT(stateChanged(QString,QVariant)));
  qDebug() << " Value is " << val;
 
 
}

example::example(const QString &service, const QString &path, const char *interface,const QDBusConnection &connection,QObject *parent):QDBusAbstractInterface(service, path, interface,connection,parent)
 {

  bool val= this->connection().connect(service,path,QString("/myInterface),QString("PropertyChanged"),QString("QString,QDBusVariant"),this,SLOT(stateChanged(QString,QVariant)));
  qDebug() << " Value is " << val;


}

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Here my Dbus signal signature is

PropertyChanged(string name, variant value)

PropertyChanged(string name, variant value)

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Always my slot is not at all connected

Could anybody provide here sample code.


Thanks

Yuvaraj

[yuvaraj.addu]

** merged! **

Hi All

Please refer this link http://www.qtcentre.org/threads/42374-Connecting-dbus-signal-iwth-Qt-Apps.

Already i have posted my issue in newbie section.


Thanks

Yuvaraj

[ChrisW67]

Deliberate cross-posting is unlikely to win you any favours.

[yuvaraj.addu]

Hi All,

Could anybody help me on this issue?

Thanks

Yuvaraj R

[ChrisW67]

You have a missing close quote in your code snippet.

Does Qt issue a warning about your connection when you run the program? Is stateChanged() declared as a slot?

[yuvaraj.addu]

Hi,

yes i declared stateChanged.

I suspect, problem with


bool val= this->connection().connect(service,path,QString("/myInterface),QString("PropertyChanged"),QString("Q String,QDBusVariant"),this,SLOT(stateChanged(QStri ng,QVariant)));



Thanks


Yuvaraj R

[ChrisW67]

You still have a missing double-quote in your code example. You didn't answer my question regarding warnings.

I don't use Dbus but a cursory reading of the docs would indicate that your third argument (interface) is not correct. It looks like a path and not a dotted DBus interface name as, for example, you see in the D-Bus Remote Controlled Car Example.

You also say that the Dbus signature is "string name, variant value" but that is not the same as the signature in your call: "Q String,QDBusVariant". I don't know if this is correct or not.

[yuvaraj.addu]

Hi,

I solved this issue 4 days back itself . I forgot to update here

Solution:

QDBusConnection::systemBus().connect(SERVICE,path,INTERFACE,"PropertyChanged",this,SLOT(stateChanged(QString,QDBusVariant)));

QDBusConnection::systemBus().connect(SERVICE,path,INTERFACE,"PropertyChanged",this,SLOT(stateChanged(QString,QDBusVariant)));

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Thanks

Yuvaraj R