如何在mapControl控件上添加feature要素？

ArcGIS Engine没有提供在MapControl中点击查询的命令，只是提供了ReaderControl中的使用的点击查询的命令，下面的代码就是实现点击查询并闪烁的代码。

过程描述

Private Sub MapControl1_OnMouseDown(ByVal button As Long, ByVal shift As Long, ByVal x As Long, ByVal y As Long, ByVal mapX As Double, ByVal mapY As Double)

Dim pMap As IMap

Dim i As Integer

Dim pPoint As IPoint

Set pMap = MapControl1.Map

Set pPoint = MapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y)

Dim pIdentify As IIdentify

Dim pIDArray As IArray

Dim pFeatIdObj As IFeatureIdentifyObj

Dim pIdObj As IIdentifyObj

Set pIdentify = pMap.Layer(1)

Dim pEnv As IEnvelope

Set pEnv = New Envelope

Set pEnv = MapControl1.ActiveView.Extent

pEnv.Height = 100

pEnv.Width = 100

pEnv.CenterAt pPoint

Set pIDArray = pIdentify.Identify(pEnv)

If Not pIDArray Is Nothing Then

Set pFeatIdObj = pIDArray.Element(0)

Set pIdObj = pFeatIdObj

pIdObj.Flash MapControl1.ActiveView.ScreenDisplay

'消息显示查询目标的信息

MsgBox "Layer:" & pIdObj.Layer.Name & vbNewLine & "Feature:" & pIdObj.Name

Else

MsgBox "No feature identified."

End If

End Sub

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