int ArxGetEntUnderPos(AcDbObjectIdArray& ids , const AcGePoint3d& pt)

{

                  ads_point ptUnder = {pt.x, pt.y, pt.z};

 

                  ads_name ss;

                  int res;

                  if (RTNORM != (res = acedSSGet(“:E”, ptUnder, NULL, NULL, ss)))

                  {

                                    // There is probably nothing under the cursor,

                                    // so return and let AutoCAD process the message

                                    return RTFAIL;

                  }

                 

                  long length = 0L;

                  acedSSLength(ss, &length);

                  if (0 == length)

                  {

                                    // There is nothing under the cursor,

                                    // so there is no need to show the context menu.

                                    // Let AutoCAD process the message.

                                    acedSSFree(ss);

                                    return RTFAIL;

                  }

 

                  ads_name ename;

                  for(int i = 0;i < length;i++)

                  {

                                    acedSSName(ss, i, ename);

                                    AcDbObjectId entId;

                                    if(Acad::eOk != acdbGetObjectId(entId, ename)) continue;

                                    ids.append(entId);

                  }

                  acedSSFree(ss);

 

                  return RTNORM;

}