glib/gio/tests/gapplication-example-dbushooks.c

#include <gio/gio.h>
#include <stdlib.h>
#include <string.h>

static void
activate (GApplication *application)
{
  g_print ("activated\n");

  /* Note: when doing a longer-lasting action here that returns
   * to the mainloop, you should use g_application_hold() and
   * g_application_release() to keep the application alive until
   * the action is completed.
   */
}

typedef GApplication TestApplication;
typedef GApplicationClass TestApplicationClass;

static GType test_application_get_type (void);
G_DEFINE_TYPE (TestApplication, test_application, G_TYPE_APPLICATION)

static gboolean
test_application_dbus_register (GApplication    *application,
                                GDBusConnection *connection,
                                const gchar     *object_path,
                                GError         **error)
{
  /* We must chain up to the parent class */
  if (!G_APPLICATION_CLASS (test_application_parent_class)->dbus_register (application,
                                                                           connection,
                                                                           object_path,
                                                                           error))
    return FALSE;

  /* Now we can do our own stuff here. For example, we could export some D-Bus objects */
  return TRUE;
}

static void
test_application_dbus_unregister (GApplication    *application,
                                  GDBusConnection *connection,
                                  const gchar     *object_path)
{
  /* Do our own stuff here, e.g. unexport any D-Bus objects we exported in the dbus_register
   * hook above. Be sure to check that we actually did export them, since the hook
   * above might have returned early due to the parent class' hook returning FALSE!
   */

  /* Lastly, we must chain up to the parent class */
  G_APPLICATION_CLASS (test_application_parent_class)->dbus_unregister (application,
                                                                        connection,
                                                                        object_path);
}

static void
test_application_init (TestApplication *app)
{
}

static void
test_application_class_init (TestApplicationClass *class)
{
  GApplicationClass *g_application_class = G_APPLICATION_CLASS (class);

  g_application_class->dbus_register = test_application_dbus_register;
  g_application_class->dbus_unregister = test_application_dbus_unregister;
}

static GApplication *
test_application_new (const gchar       *application_id,
                      GApplicationFlags  flags)
{
  g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);

  g_type_init ();

  return g_object_new (test_application_get_type (),
                       "application-id", application_id,
                       "flags", flags,
                       NULL);
}

int
main (int argc, char **argv)
{
  GApplication *app;
  int status;

  app = test_application_new ("org.gtk.TestApplication", 0);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  g_application_set_inactivity_timeout (app, 10000);

  status = g_application_run (app, argc, argv);

  g_object_unref (app);

  return status;
}