错误图层上的块

Public Sub BlocksAndXrefsToZeroLayer()
    Dim oEnt As AcadEntity
    Dim I As Integer
    Dim oSS As AcadSelectionSet
    Dim iType(3) As Integer
    Dim vData(3) As Variant
    Dim P1(2) As Double
    Dim P2(2) As Double
    Set oSS = getSS("zlayer")
    iType(0) = -4: vData(0) = ""
    oSS.Select acSelectionSetAll, P1, P2, iType, vData
    If oSS.Count < 1 Then Exit Sub
    For I = 0 To oSS.Count - 1
        Set oEnt = oSS(I)
        If ThisDrawing.Layers(oEnt.Layer).Lock Then
            ' entity is on a locked layer - can't change it
        Else
            oEnt.Layer = "0"
            oEnt.Update
        End If
    Next
End Sub
Public Function getSS(strName As String) As AcadSelectionSet
    Dim SS As AcadSelectionSet
    On Error Resume Next
    ThisDrawing.SelectionSets(strName).Delete
    Set SS = ThisDrawing.SelectionSets.Add(strName)
    Set getSS = SS
End Function