H5T_GET_MEMBER_VALUE returns the value of the enumeration datatype member
The member value is returned in a user-supplied buffer pointed to by
value. Values returned in
value will be of the enumerated type’s base type, that is, the datatype used by H5T_ENUM_CREATE when the enumerated type was created.
value buffer must be at least large enough to hold a value of that base type. If the size is unknown, you can determine it with H5T_GET_SIZE,
dtype_id is set to the base type.