Obtains data which has previously been attached to @type with g_type_set_qdata().
Note that this does not take subtyping into account; data attached to one type with g_type_set_qdata() cannot be retrieved from a subtype using g_type_get_qdata().
a #GType
a #GQuark id to identify the data
the data, or %NULL if no data was found
See Implementation
Obtains data which has previously been attached to @type with g_type_set_qdata().
Note that this does not take subtyping into account; data attached to one type with g_type_set_qdata() cannot be retrieved from a subtype using g_type_get_qdata().