CAD计算两曲线间最短路径（com接口）

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axMxDrawX1.StopAllTwinkeEnt();                 MxDrawEntity ent1 = (MxDrawEntity)(axMxDrawX1.GetEntity("选择开始曲线:") );                 if (ent1 == null)                     return;                   MxDrawEntity ent2 = (MxDrawEntity)(axMxDrawX1.GetEntity("选择结束曲线:"));                 if (ent2 == null)                     return;                   MxDrawDatabase database = (MxDrawDatabase)(axMxDrawX1.GetDatabase());                   MxDrawResbuf param = new MxDrawResbuf();                 param.AddObjectId(ent1.ObjectID);                 param.AddObjectId(ent2.ObjectID);                   MxDrawResbuf ret = (MxDrawResbuf)(axMxDrawX1.CallEx("ExApp_ShortestPath",param));                 if (ret.AtString(0) != "Ok")                 {                     MessageBox.Show("曲线不连通!");                 }                 else                 {                     for (int i = 1; i < ret.Count; i++)                     {                         Int64 lId = ret.AtObjectId(i);                         axMxDrawX1.TwinkeEnt(lId);                           // 由lId得到对象，并得到对象的坐标                         MxDrawMcDbObject obj = database.ObjectIdToObject(lId);                         if (obj == null)                             continue;                           if (obj is MxDrawLine)                         {                             MxDrawLine line = (MxDrawLine)obj;                             MxDrawPoint sPt = (MxDrawPoint)(line.StartPoint);                             MxDrawPoint ePt = (MxDrawPoint)(line.EndPoint);                               //MessageBox.Show(sPt.x.ToString() + "," + sPt.y.ToString() + ","                              //   + ePt.x.ToString() + "," + ePt.y.ToString()                              //   );                         }                         else if (obj is MxDrawText)                         {                             MxDrawText text = (MxDrawText)obj;                             // 是这文字对象                           }                     }                 }