Hi Daniel,
Thank you very much. I have some more questions.
If I used g_signal_connect at the same program for g_signal_emit, for
example, in modemmanager, I can receive that signal because I know the right
object for the signal to connect.
However, in a different program, how can I get the right GObject to connect
the signal?
For example, in the open source modemmanager, there is a function called "
g_signal_emit (self, signals[SIGNAL_QUALITY], 0, quality)", where object:
self is a modemclass. If I write my own applet, how can I set
"g_signal_connect" with right Object of Modem? I mean how can I get the
right object pointer of Modem for the signal to be connected?
In addition, I found in the openSource applet, there is a function to
connect signal"SignalQuality" as follows:
dbus_g_proxy_add_signal (info->cdma_proxy, "SignalQuality",
G_TYPE_UINT, G_TYPE_INVALID);
dbus_g_proxy_connect_signal (info->cdma_proxy, "SignalQuality",
G_CALLBACK (signal_quality_changed_cb),
info, NULL);
But I didn't find a place to emit this signal("SignalQuality") either in
modemmanager or in the networkmanager. Something missed in modemmanager or
networkmanager?
thanks a lot for the help
hong
>
On Tue, Oct 26, 2010 at 7:52 PM, Daniel Yek
<[email protected]>wrote:
>
> On Wed, October 27, 2010 7:19 am, hong sheng wrote:
> > I am reading the NetworkManager code as well as ModemManager code.
> > I noticed that NetworkManager is
> > using "g_object_notify" to send out the event signals,
> > while ModemManager is using "g_signal_emit" to emit signals.
> >
> > Anyone knows what's the difference between these two function call?
>
> Hi Hong Sheng,
>
> Most of these are pure GTK+ questions.
>
> g_signal_emit_by_name() and g_signal_emit() are the typical ways to emit
> GTK+ signals.
>
> g_object_notify() is usually used when implementing a GObject (as opposed
> to using a ready-made GObject.)
>
> g_object_notify() emits a "notify" signal for the property property_name
> on object.
>
> > In the Applet,
> > if I want to listen to the signal sent from g_object_notify,
> > what should I listen?
>
> g_signal_connect( G_OBJECT(the_gobject_with_relevant_property),
> "notify::DetailNameHere",
> G_CALLBACK(my_notify_detailname_property_change_callback),
> userdata_or_window_if_desired);
>
> The "notify" signal callback functions have this function prototype:
>
> void my_notify_detailname_property_change_callback(
> GObject *the_gobject_with_relevant_property,
> GParamSpec *arg1,
> gpointer userdata_or_window_if_desired);
>
>
> > If I want to listen to the signal sent from
> > g_signal_emit, how can I implement it?
>
> This is just the same as how you program a GTK+ application normally:
> g_signal_connect( G_OBJECT(the_relevant_gobject),
> "signal_name",
> G_CALLBACK(my_callback_func),
> NULL );
>
> The GTK+ mailing list is at:
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
>
> The callback function prototype depends on the signal.
> You can, usually, find that out by
> looking at (NetworkManager) documentation
> (easy for newbies, but I don't know if it is there),
> looking for a sample handler (callback) function (easy too),
> searching through the (NetworkManager) source code
> to find out its default handler and
> append an extra userdata argument
> (more involved and confusing for newbies.)
>
> The callback function prototype used is not generic to GTK+, but specific
> to NetworkManager.
>
> Regards,
>
> --
> Daniel Yek
>
>
> >
> > thanks
> >
> > Xiaohong
>
>
>
>
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