[VBA]用VBA宏自动改变Excel宏安全级别设置

Option Explicit
Sub SetExcelVBA()
'练习
'功能：改变Excel的安全级别
'使用：Wscript，FileSystemObject，创建txt文件，注册表操作，VBS文件自我删除，改变Excel文件读写属性等
'By [e-mail]
Dim WSH As Object, ret As String, regStr As String
Dim strFullname As String, strVBS As String
Dim tf, fso, RetVal
'本程序仅适用于Excel 2003( 11.0)，如果当前版本不是2003则退出
If Application.Version <> "11.0" Then MsgBox "本代码仅在 Excel 2003 下可使用! ", vbOKOnly + vbCritical, "Keanjeason": Exit Sub
strFullname = ThisWorkbook.FullName '取得当前工作薄的全名
strVBS = Replace(UCase(strFullname), ".XLS", ".vbs") 'temp文件VBS的文件名
Set WSH = CreateObject("Wscript.Shell") '创建Wscript对象
Err.Clear
On Error Resume Next
regStr = "HKEY_CURRENT_USER/Software/Microsoft/Office/11.0/Excel/Security/Level" '注册表中Excel vba安全级别位置
ret = WSH.RegRead(regStr) '读取当前安全级别
If Err.Number <> 0 Then
      '判断读取是否成功
      MsgBox "从注册表读取当前Excel VBA安全级别设置失败，本程序将退出! ", vbOKOnly + vbCritical, "Keanjeason"
      Exit Sub
Else
   '如果当前Excel VBA安全级别不为“低”,则设置为“低”,值1-4分别对应：低，中，高，非常高
   If Val(ret) <> 1 Then ret = WSH.RegWrite(regStr, "1", "REG_DWORD")
End If
Set fso = CreateObject("Scripting.FileSystemObject")
Set tf = fso.CreateTextFile(strVBS, True) '创建temp文件VBS文件
With tf
     '写入VBS文件内容
     .WriteLine ("Dim oExcel,fso,delme")
     .WriteLine ("Set fso = CreateObject(""Scripting.FileSystemObject"")")
     .WriteLine ("Set oExcel = CreateObject(""excel.application"")")
     .WriteLine ("oExcel.Workbooks.Open " & Chr(34) & strFullname & Chr(34))
     .WriteLine ("oExcel.Visible=true")
     .WriteLine ("Set oExcel = Nothing")
     .WriteLine ("delme = fso.DeleteFile(" & Chr(34) & strVBS & Chr(34) & ")")
     .Close
End With
With ThisWorkbook
     '将当前文件属性设置为“只读”，以方便重新打开
     .ChangeFileAccess Mode:=xlReadOnly
     .Saved = True
End With
RetVal = WSH.Run(Chr(34) & strVBS & Chr(34), 1, True) '运行刚刚创建的VBS文件，新启动一个Excel程序
Application.Quit '退出当前Excel
Set WSH = Nothing
Set fso = Nothing
End Sub