GAMBAS BOOK 3.15.2

The class DBusApplication (gb.dbus) represents an application registered on the D-Bus. You can create this class. It behaves like an array that you can only read.

The class DBusApplication has the following properties:

Table 24.9.3.1.1: Properties of Class DBusApplication

The class DBusApplication has these three methods:

Table 24.9.3.2.1: Methods of Class DBusApplication

With New DBusApplication(parameter list) you can create a DBusApplication object:

  Dim hDBusApplication As DBusApplication

  hDBusApplication = New DBusApplication ( Connection As DBusConnection, ApplicationName As String )

The created object represents an application that is connected to the session bus or the system bus. The following applies to both parameters:

• Connection is a D-Bus connection object (DBus.Session or DBus.System)
• ApplicationName is the name of the application on the D-Bus.

Alternatively, you can also use DBus[ ApplicationName ] as an array.

The class DBusApplication behaves like a read-only array. The following two source texts use this fact - the first only formally:

  Dim hDBusApplication As DBusApplication
  Dim hDBusProxy As DBusProxy

  hDBusProxy = hDBusApplication [ ObjectPath As String [ , Interface As String ] ]

hDBusProxy returns a proxy to an (existing) D-Bus object specified in the first parameter.

• ObjectPath is the D-Bus path to the object.
• Interface is the interface of the object you want to use.

If the argument for the optional parameter Interface is not specified, you have access to each method and all properties of the (exported) object. Otherwise, you only have access to methods and properties of the specified interface - as in the following example:

  Dim hDBusApplication As DBusApplication
  Dim hDBusProxy As DBusProxy
  Dim sDBusName, sDBusObjectPath, sDBusInterface As String
  Dim hConnection As DBusConnection
 
  hConnection =  DBus.Session
  sDBusName = "org.freedesktop.Notifications"
  sDBusObjectPath = "/org/freedesktop/Notifications"
  sDBusInterface = "org.freedesktop.Notifications"
 
  hDBusApplication = New DBusApplication(hConnection, sDBusName)
  hDBusProxy = New DBusProxy(hDBusApplication, sDBusObjectPath, sDBusInterface)

In terms of good data encapsulation, the generation of an interface on the side of the application that exports the object to the D-Bus is always an advantage.