objcetArx按长度 选择线段

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objcetArx 如何快速选择 长度大于多少的线段。 选择集里面那个那个组合是线段的长度？[code]ads_name sset, newss;
int result = acedSSGet(NULL, NULL, NULL, NULL, sset);
if (result != RTNORM) { return; }
Adesk::Int32 length = 0;
acedSSLength(sset, &length);
Acad::ErrorStatus es = Acad::eOk;
double dLength = 10.0; // 过滤线段的长度，假设为10米
acedSSAdd(NULL, NULL, newss);
for (int i = 0; i < length; i++)
{
    ads_name ename;
    acedSSName(sset, i, ename);
    AcDbObjectId objId = AcDbObjectId::kNull;
    es = acdbGetObjectId(objId, ename);
    if (es != Acad::eOk) { continue; }
    AcDbEntity* pEnt = NULL;
    es = acdbOpenObject(pEnt, objId, AcDb::kForRead);
    if (es != Acad::eOk) { continue; }
    if (pEnt->isKindOf(AcDbCurve::desc()))
    {
        AcDbCurve* pCurve = AcDbCurve::cast(pEnt);
        AcGePoint3d entPt;
        pCurve->getEndPoint(entPt);
        double length = 0.0;
        pCurve->getDistAtPoint(entPt, length);
        if (length >= dLength)
            acedSSAdd(ename, newss, newss);
        pCurve->close();
    }
    pEnt->close();
}
acedSSFree(sset);
acedSSSetFirst(newss, NULL); // 测试亮响
// ...
acedSSFree(newss);[/code]