【c++】ObjectARX获取多段线的节点

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【c++】ObjectARX获取多段线的节点
void  collectVertices(const AcDb3dPolyline* pline, AcGePoint3dArray& pts)
{
    ASSERT(pline != NULL);
    ASSERT(pts.isEmpty());

    AcDbObjectIterator* vertexIter = pline->vertexIterator();
    ASSERT(vertexIter != NULL);
    if (vertexIter == NULL)
        return;

    AcDb3dPolylineVertex* vertex;
    for (; !vertexIter->done(); vertexIter->step()) {
        if (acdbOpenObject(vertex, vertexIter->objectId(), AcDb::kForRead) == Acad::eOk) {
            if (vertex->vertexType() != AcDb::k3dControlVertex)
                pts.append(vertex->position());
            vertex->close();
        }
    }
    delete vertexIter;

    ASSERT(pts.isEmpty() == false);

    if (pline->isClosed()) {
        AcGePoint3d tmpPt = pts[0];        // used to be a bug in dynamic arrays (not sure if its still there??)
        pts.append(tmpPt);
    }
}