如何选择范围比较？

• 回答：

  首先通过id得到两个控件，返回控件的数据库对象，把两个控件里面不同的内容标记出来，具体实现js代码如下：

  
  

  function DoImpCompare(points, filter) {
  
      var ocx1 = document.getElementById("MxDrawXCtrl1");
      var ocx2 = document.getElementById("MxDrawXCtrl2");
  
      var database1 = ocx1.GetDatabase();
      var database2 = ocx2.GetDatabase();
  
      var compare1 = ocx1.NewComObject("IMxDrawCompare");
      compare1.Bound = points;
  
      compare1.Do(database1, database2, filter);
  
      var aryDifferent1 = compare1.GetCurveIdsOfTheDifferent();
  
      compare1.DrawFlag(1.0, false);
      // 反过来比较一下，用来确定，那些对象是新增加的。
      var compare2 = ocx1.NewComObject("IMxDrawCompare");
      compare2.Bound = points;
      compare2.Do(database2, database1, filter);
  
      var aryDifferent2 = compare2.GetCurveIdsOfTheDifferent();
      
      compare2.DrawFlag(1.0, true);
      
      var iErase = 0;
      var iModify = 0;
      var iAdd = 0;
      for (var i = 0; i < aryDifferent1.Count; i++) {
          var lId = aryDifferent1.AtObjectId(i);
          if (compare1.GetIsErase(lId)) {
              iErase = iErase + 1;
          }
          else {
              iModify = iModify + 1;
          }
      }
      for (var i = 0; i < aryDifferent2.Count; i++) {
          var lId = aryDifferent2.AtObjectId(i);
          if (compare2.GetIsErase(lId)) {
              iAdd = iAdd + 1;
          }
      }
      alert(iModify + "对象修改," + iErase + "对象删除," + iAdd + "对象被增加");
  }

  
  

  用户可以选取范围内的图纸作比较，具体实现js代码如下：

  
  

  function BoundCompare() {
  
      var ocx1  = document.getElementById("MxDrawXCtrl1");
      var getPt = ocx1.NewComObject("IMxDrawUiPrPoint");
      getPt.message = "点取第一点";
      if(getPt.go() != 1)
          return;
      var frstPt = getPt.value();
      var getCorner = ocx1.NewUtility();
      var secondPt =  getCorner.GetCorner(frstPt,"点取第二点:");
      if(secondPt == null)
          return;
      var points = ocx1.NewComObject("IMxDrawPoints");
      points.Add2(frstPt);
      points.Add2(secondPt);
      var filter = ocx1.NewResbuf();
      DoImpCompare( points, filter);
  }