CAD在网页绘一个直线，得到直线id,再调该得到直线对象，然写扩展数据

IMxDrawDatabase::ObjectIdToObject

实体id返回实体对象。

参数	说明
[in] LONGLONG lId	实体id

JS代码，中绘一个直线，得到直线id,再调该得到直线对象，然写扩展数据的例子。

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function DoCommandEventFunc(iCmd) {         if (iCmd == 1)         {         var mxOcx = document.all.item("MxDrawXCtrl");                 mxOcx.focus();         var point1 = mxOcx.GetPoint(null,"n 点取开始点:");         if(point1 == null)         {             return;         }         var point2 = mxOcx.GetPoint(point1,"n 点取结束点:");         if(point1 == null)         {             return;         }                 // 直线的id                 var lineId = mxOcx.DrawLine(point1.x,point1.y,point2.x,point2.y);                   // 为新写的直线写一个字符串扩展数据                 var database = mxOcx.GetDatabase();                 var ent = database.ObjectIdToObject(lineId);                    if(ent == null)                {                   return;                }             var exData = mxOcx.Call("Mx_NewResbuf","");             exData.AddString("TestApp",1001);                 exData.AddString("用户的扩展数据内容。。。",1000);             ent.SetXData(exData);       } }