void CTestVc2005Dlg::CustomEntity_getGeomExtentsMxdrawxctrl1(LPDISPATCH pCustomEntity, double* dMinX, double* dMinY, double* dMaxX, double* dMaxY, long* pOk)
                {
                    // TODO: 在此处添加消息处理程序代码
                    *pOk = 1;
                    IMxDrawCustomEntityPtr spDrawData;
                    pCustomEntity->QueryInterface(&spDrawData);

                    CString sGuid = spDrawData->Guid;
                    if(sGuid == MX_CUSTOM_ENTITY_ID)
                    {
                        if(spDrawData->IsHave(_T("ept") )  != VARIANT_TRUE)
                            return;

                        IMxDrawPointPtr stp =  spDrawData->GetPoint(_T("spt"));
                        if(stp == NULL)
                            return;

                        IMxDrawPointPtr ept =  spDrawData->GetPoint(_T("ept"));
                        if(ept == NULL)
                            return;

                        *dMinX = stp->x;
                        *dMinY = stp->y;

                        *dMaxX = ept->x;
                        *dMaxY = ept->y;
                    }
                }