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dbus_bool_t hal_device_property_exists ( LibHalContext ctx,
const char *  udi,
const char *  key 
)

Determine if a property on a device exists.

Parameters:
ctx The context for the connection to hald
udi Unique device id.
key Name of the property
Returns:
TRUE if the device exists

Definition at line 1841 of file libhal.c.

References LibHalContext_s::connection.

{
      DBusError error;
      DBusMessage *message;
      DBusMessage *reply;
      DBusMessageIter iter;
      dbus_bool_t value;

      message = dbus_message_new_method_call ("org.freedesktop.Hal", udi,
                                    "org.freedesktop.Hal.Device",
                                    "PropertyExists");
      if (message == NULL) {
            fprintf (stderr,
                   "%s %d : Couldn't allocate D-BUS message\n",
                   __FILE__, __LINE__);
            return FALSE;
      }

      dbus_message_iter_init (message, &iter);
      dbus_message_iter_append_string (&iter, key);

      dbus_error_init (&error);
      reply = dbus_connection_send_with_reply_and_block (ctx->connection,
                                             message, -1,
                                             &error);
      if (dbus_error_is_set (&error)) {
            fprintf (stderr, "%s %d : Error sending msg: %s\n",
                   __FILE__, __LINE__, error.message);
            dbus_message_unref (message);
            return FALSE;
      }
      if (reply == NULL) {
            dbus_message_unref (message);
            return FALSE;
      }

      dbus_message_iter_init (reply, &iter);

      /* now analyse reply */
      if (dbus_message_iter_get_arg_type (&iter) != DBUS_TYPE_BOOLEAN) {
            fprintf (stderr, "%s %d : expected a bool in reply to "
                   "PropertyExists\n", __FILE__, __LINE__);
            dbus_message_unref (message);
            dbus_message_unref (reply);
            return FALSE;
      }

      value = dbus_message_iter_get_boolean (&iter);

      dbus_message_unref (message);
      dbus_message_unref (reply);
      return value;
}


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