To developers.

Interacting with Skype over DBus/GLib.
Setting up the "Notify" method call so we can receive messages from the Skype.

Step 0) Define a XML file that descripes the method signatures.

Ref:http://lists.freedesktop.org/archives/dbus/2010-December/013910.html
    http://dbus.freedesktop.org/doc/dbus-tutorial.html#glib-server

Create a XML definition file.
Study: xml/skype-service-object.xml.

<?xml version="1.0" encoding="UTF-8" ?>
<node>
  <interface name="com.Skype.API.Client">
    <method name="Notify">
      <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="skype_service_notify_callback"/>
      <arg type="s" name="message" direction="in"/>
    </method>
  </interface>
</node>

To notify its clients, Skype will call the skype_service_notify_callback(...) method and it sends 
one "in" argument of type "s" string. It takes no "out" arguments.
----

Step 1) Then use the dbus-binding-tool to generate a header file from the XML. Run 
$ dbus-binding-tool --prefix=server_object --mode=glib-server skype-service-object.xml > skype-service-object-glue.h

Include the generated header file (skype-service-object-glue.h) to our project.

Study:
src/skype-service-object-glue.h.
----

Step 2) Create a new GObject where you implement the skype_service_notify_callback(...) method.
Ref:http://library.gnome.org/devel/gobject/stable/
    http://live.gnome.org/DBusGlibBindings

Study:
src/skype-service.h and 
src/skype-service.c.
----

Step 3) Create a service object and setup the method callbacks.
See the skype_setup_notify_methods() function in src/dbus-skype.c.
----

Step 4) Module to interact with the Skype over DBus.
Study:
src/dbus-skype.c