ilayshp

{
    BaseDocument *doc = GetActiveDocument();

    BaseObject *obj = (BaseObject *) doc->GetActiveObject();
    if(!obj) return FALSE;

    XPressoTag *xTag = (XPressoTag*)obj->GetTag(Texpresso, 0);
    if(!xTag) return FALSE;

    GvNodeMaster *nm = xTag->GetNodeMaster(); 

ilayshp

import c4d

def main():
    global vecoutp
    obj = doc.GetActiveObject()
    tag = doc.GetActiveTag()
    if not tag:
        tag = c4d.BaseTag(c4d.Texpresso)
        obj.InsertTag(tag)