Loads a loadable icon. For the asynchronous version of this function, see g_loadable_icon_load_async().
an integer.
a location to store the type of the loaded icon, NULL to ignore.
optional gio.Cancellable object, NULL to ignore.
a gio.InputStream to read the icon from.
GException on failure.
Loads a loadable icon. For the asynchronous version of this function, see g_loadable_icon_load_async().