how to use vertind to retrieve dwg_ent_vertex_pface in current dwg_data?

[zefreestijl]

Hi, I was successfully able to get the vertind from dwg_ent_vert_pface_face,
but I don't know the correct way to use this value for retrieving a certain vertex point,

I tried to collect all the vertex points by iterating objects through dwg_get_object() to a vector,
but seems the sequence is not as the same as how vertind works,

and I found there's another functionality calls dwg_getall_VERTEX_PFACE(),
but I couldn't figure out how to convert my dwg_data to its input type,

any advice would be greatfully appreciated,
thank you in advance :]