C++ G_IS_VOLUME函数代码示例

/**
 * g_volume_eject_with_operation:
 * @volume: a #GVolume
 * @flags: flags affecting the unmount if required for eject
 * @mount_operation: (allow-none): a #GMountOperation or %NULL to
 *     avoid user interaction
 * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
 * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL
 * @user_data: user data passed to @callback
 *
 * Ejects a volume. This is an asynchronous operation, and is
 * finished by calling g_volume_eject_with_operation_finish() with the @volume
 * and #GAsyncResult data returned in the @callback.
 *
 * Since: 2.22
 **/
void
g_volume_eject_with_operation (GVolume              *volume,
                               GMountUnmountFlags   flags,
                               GMountOperation     *mount_operation,
                               GCancellable        *cancellable,
                               GAsyncReadyCallback  callback,
                               gpointer             user_data)
{
  GVolumeIface *iface;

  g_return_if_fail (G_IS_VOLUME (volume));

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->eject == NULL && iface->eject_with_operation == NULL)
    {
      g_task_report_new_error (volume, callback, user_data,
                               g_volume_eject_with_operation,
                               G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                               /* Translators: This is an error
                                * message for volume objects that
                                * don't implement any of eject or eject_with_operation. */
                               _("volume doesn't implement eject or eject_with_operation"));
      return;
    }

  if (iface->eject_with_operation != NULL)
    (* iface->eject_with_operation) (volume, flags, mount_operation, cancellable, callback, user_data);
  else
    (* iface->eject) (volume, flags, cancellable, callback, user_data);
}

/**
 * g_volume_mount:
 * @volume: a #GVolume
 * @flags: flags affecting the operation
 * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid user interaction
 * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
 * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL
 * @user_data: user data that gets passed to @callback
 * 
 * Mounts a volume. This is an asynchronous operation, and is
 * finished by calling g_volume_mount_finish() with the @volume
 * and #GAsyncResult returned in the @callback.
 *
 * Virtual: mount_fn
 */
void
g_volume_mount (GVolume             *volume,
		GMountMountFlags     flags,
                GMountOperation     *mount_operation,
                GCancellable        *cancellable,
                GAsyncReadyCallback  callback,
                gpointer             user_data)
{
  GVolumeIface *iface;

  g_return_if_fail (G_IS_VOLUME (volume));

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->mount_fn == NULL)
    {
      g_task_report_new_error (volume, callback, user_data,
                               g_volume_mount,
                               G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                               _("volume doesn't implement mount"));
      return;
    }
  
  (* iface->mount_fn) (volume, flags, mount_operation, cancellable, callback, user_data);
}

static void
xfdesktop_volume_icon_changed(GVolume *volume,
                              XfdesktopVolumeIcon *volume_icon)
{
    g_return_if_fail(G_IS_VOLUME(volume));
    g_return_if_fail(XFDESKTOP_IS_VOLUME_ICON(volume_icon));

    DBG("VOLUME CHANGED");

    /**
     * NOTE: We use a timeout here to check if the volume is 
     * now mounted (or has been unmounted). This timeout seems
     * to be needed because when the "changed" signal is emitted,
     * the GMount is always NULL. In a 500ms timeout we check
     * at most 5 times for a valid mount until we give up. This
     * hopefully is a suitable workaround for most machines and
     * drives. 
     */

    /* abort an existing timeout, we may have to run it a few times
     * once again for the new event */
    if(volume_icon->priv->changed_timeout_id > 0) {
        g_source_remove(volume_icon->priv->changed_timeout_id);
        volume_icon->priv->changed_timeout_id = 0;
    }

    /* reset timeout information and start a timeout */
    volume_icon->priv->changed_timeout_count = 0;
    volume_icon->priv->changed_timeout_id =
        g_timeout_add_full(G_PRIORITY_LOW, 500, 
                           (GSourceFunc) volume_icon_changed_timeout, 
                           g_object_ref(volume_icon),
                           g_object_unref);
}

static void
eject_cb (GObject *object, GAsyncResult *result, gpointer nothing)
{
	GError *error = NULL;

	if (G_IS_VOLUME (object)) {
		GVolume *volume = G_VOLUME (object);

		rb_debug ("finishing ejection of volume");
		g_volume_eject_with_operation_finish (volume, result, &error);
	} else if (G_IS_MOUNT (object)) {
		GMount *mount = G_MOUNT (object);

		rb_debug ("finishing ejection of mount");
		g_mount_eject_with_operation_finish (mount, result, &error);
	}

	if (error != NULL) {
		if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_FAILED_HANDLED)) {
			rb_error_dialog (NULL, _("Unable to eject"), "%s", error->message);
		} else {
			rb_debug ("eject failure has already been handled");
		}
		g_error_free (error);
	}
}

char *
rb_gvolume_get_udi (GVolume *volume, gpointer ctx)
{
	char *udi, *dev, **udis;
	int num_udis;

	g_return_val_if_fail (volume != NULL, NULL);
	g_return_val_if_fail (G_IS_VOLUME (volume), NULL);
	g_return_val_if_fail (ctx != NULL, NULL);

	udi = g_volume_get_identifier (volume, G_VOLUME_IDENTIFIER_KIND_HAL_UDI);
	if (udi != NULL)
		return udi;

	dev = g_volume_get_identifier (volume, G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE);
	udis = libhal_manager_find_device_string_match ((LibHalContext *) ctx,
							"block.device", dev,
							&num_udis, NULL);

	if (udis == NULL || num_udis < 1) {
		libhal_free_string_array (udis);
		return NULL;
	}

	udi = g_strdup (udis[0]);
	libhal_free_string_array (udis);

	return udi;
}

/**
 * g_volume_get_drive:
 * @volume: a #GVolume
 * 
 * Gets the drive for the @volume.
 * 
 * Returns: (transfer full): a #GDrive or %NULL if @volume is not
 *     associated with a drive. The returned object should be unreffed
 *     with g_object_unref() when no longer needed.
 */
GDrive *
g_volume_get_drive (GVolume *volume)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);

  iface = G_VOLUME_GET_IFACE (volume);

  return (* iface->get_drive) (volume);
}

/**
 * g_volume_get_mount:
 * @volume: a #GVolume
 * 
 * Gets the mount for the @volume.
 * 
 * Returns: (transfer full): a #GMount or %NULL if @volume isn't mounted.
 *     The returned object should be unreffed with g_object_unref()
 *     when no longer needed.
 */
GMount *
g_volume_get_mount (GVolume *volume)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);

  iface = G_VOLUME_GET_IFACE (volume);

  return (* iface->get_mount) (volume);
}

/**
 * g_volume_get_activation_root:
 * @volume: a #GVolume
 *
 * Gets the activation root for a #GVolume if it is known ahead of
 * mount time. Returns %NULL otherwise. If not %NULL and if @volume
 * is mounted, then the result of g_mount_get_root() on the
 * #GMount object obtained from g_volume_get_mount() will always
 * either be equal or a prefix of what this function returns. In
 * other words, in code
 *
 * |[<!-- language="C" -->
 *   GMount *mount;
 *   GFile *mount_root
 *   GFile *volume_activation_root;
 *
 *   mount = g_volume_get_mount (volume); /&ast; mounted, so never NULL &ast;/
 *   mount_root = g_mount_get_root (mount);
 *   volume_activation_root = g_volume_get_activation_root (volume); /&ast; assume not NULL &ast;/
 * ]|
 * then the expression
 * |[<!-- language="C" -->
 *   (g_file_has_prefix (volume_activation_root, mount_root) ||
      g_file_equal (volume_activation_root, mount_root))
 * ]|
 * will always be %TRUE.
 *
 * Activation roots are typically used in #GVolumeMonitor
 * implementations to find the underlying mount to shadow, see
 * g_mount_is_shadowed() for more details.
 *
 * Returns: (transfer full): the activation root of @volume or %NULL. Use
 *     g_object_unref() to free.
 *
 * Since: 2.18
 */
GFile *
g_volume_get_activation_root (GVolume *volume)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);
  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->get_activation_root == NULL)
    return NULL;

  return (* iface->get_activation_root) (volume);
}

void
thunar_notify_eject_finish (GVolume *volume)
{
  NotifyNotification *notification;

  g_return_if_fail (G_IS_VOLUME (volume));

  notification = g_object_get_data (G_OBJECT (volume), "thunar-notification");
  if (notification != NULL)
    {
      notify_notification_close (notification, NULL);
      g_object_set_data (G_OBJECT (volume), "thunar-notification", NULL);
    }
}

/**
 * g_volume_get_sort_key:
 * @volume: a #GVolume
 *
 * Gets the sort key for @volume, if any.
 *
 * Returns: Sorting key for @volume or %NULL if no such key is available
 *
 * Since: 2.32
 */
const gchar *
g_volume_get_sort_key (GVolume *volume)
{
  const gchar *ret = NULL;
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);

  iface = G_VOLUME_GET_IFACE (volume);
  if (iface->get_sort_key != NULL)
    ret = iface->get_sort_key (volume);

  return ret;
}

/**
 * g_volume_should_automount:
 * @volume: a #GVolume
 *
 * Returns whether the volume should be automatically mounted.
 * 
 * Returns: %TRUE if the volume should be automatically mounted
 */
gboolean
g_volume_should_automount (GVolume *volume)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), FALSE);

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->should_automount == NULL)
    return FALSE;

  return (* iface->should_automount) (volume);
}

/**
 * g_volume_can_eject:
 * @volume: a #GVolume
 * 
 * Checks if a volume can be ejected.
 * 
 * Returns: %TRUE if the @volume can be ejected. %FALSE otherwise
 */
gboolean
g_volume_can_eject (GVolume *volume)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), FALSE);

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->can_eject == NULL)
    return FALSE;

  return (* iface->can_eject) (volume);
}

/**
 * g_volume_get_identifier:
 * @volume: a #GVolume
 * @kind: the kind of identifier to return
 *
 * Gets the identifier of the given kind for @volume. 
 * See the <link linkend="volume-identifier">introduction</link>
 * for more information about volume identifiers.
 *
 * Returns: a newly allocated string containing the
 *     requested identfier, or %NULL if the #GVolume
 *     doesn't have this kind of identifier
 */
char *
g_volume_get_identifier (GVolume    *volume,
			 const char *kind)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);
  g_return_val_if_fail (kind != NULL, NULL);

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->get_identifier == NULL)
    return NULL;
  
  return (* iface->get_identifier) (volume, kind);
}

/**
 * g_volume_get_symbolic_icon:
 * @volume: a #GVolume
 * 
 * Gets the symbolic icon for @volume.
 * 
 * Returns: (transfer full): a #GIcon.
 *     The returned object should be unreffed with g_object_unref()
 *     when no longer needed.
 *
 * Since: 2.34
 */
GIcon *
g_volume_get_symbolic_icon (GVolume *volume)
{
  GVolumeIface *iface;
  GIcon *ret;

  g_return_val_if_fail (G_IS_VOLUME (volume), NULL);

  iface = G_VOLUME_GET_IFACE (volume);

  if (iface->get_symbolic_icon != NULL)
    ret = iface->get_symbolic_icon (volume);
  else
    ret = g_themed_icon_new_with_default_fallbacks ("folder-remote-symbolic");

  return ret;

}

/**
 * g_volume_eject_finish:
 * @volume: pointer to a #GVolume
 * @result: a #GAsyncResult
 * @error: a #GError location to store an error, or %NULL to ignore
 * 
 * Finishes ejecting a volume. If any errors occurred during the operation,
 * @error will be set to contain the errors and %FALSE will be returned.
 * 
 * Returns: %TRUE, %FALSE if operation failed
 *
 * Deprecated: 2.22: Use g_volume_eject_with_operation_finish() instead.
 **/
gboolean
g_volume_eject_finish (GVolume       *volume,
                       GAsyncResult  *result,
                       GError       **error)
{
  GVolumeIface *iface;

  g_return_val_if_fail (G_IS_VOLUME (volume), FALSE);
  g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);

  if (g_async_result_legacy_propagate_error (result, error))
    return FALSE;
  if (g_async_result_is_tagged (result, g_volume_eject_with_operation))
    return g_task_propagate_boolean (G_TASK (result), error);
  
  iface = G_VOLUME_GET_IFACE (volume);
  return (* iface->eject_finish) (volume, result, error);
}