def get_guid_str(guid_array):
    """ Convert a guid array into string. """
    prefix = guid_array[:12]
    entity = guid_array[12:16]
    prefix_str = '.'.join('{:x}'.format(c) for c in prefix)
    entity_str = '.'.join('{:x}'.format(c) for c in entity)
    return '|'.join([prefix_str, entity_str])