rivate FormOldWidth As Long '保存窗体的原始宽度
Private FormOldHeight As Long '保存窗体的原始高度


'在调用ResizeForm前先调用本函数
Public Sub ResizeInit(FormName As Form)

Dim Obj As Control
FormOldWidth = FormName.ScaleWidth
FormOldHeight = FormName.ScaleHeight
On Error Resume Next


For Each Obj In FormName
Obj.Tag = Obj.Left & " " & Obj.Top & " " & Obj.Width & " " & Obj.Height & " "
Next Obj

On Error GoTo 0

End Sub

'按比例改变表单内各元件的大小， 在调用ReSizeForm前先调用ReSizeInit函数

Public Sub ResizeForm(FormName As Form)

Dim Pos(4) As Double
Dim i As Long, TempPos As Long, StartPos As Long
Dim Obj As Control
Dim ScaleX As Double, ScaleY As Double


ScaleX = FormName.ScaleWidth / FormOldWidth '保存窗体宽度缩放比例
ScaleY = FormName.ScaleHeight / FormOldHeight '保存窗体高度缩放比例

On Error Resume Next

For Each Obj In FormName
StartPos = 1

For i = 0 To 4 '读取控件的原始位置与大小
TempPos = InStr(StartPos, Obj.Tag, " ", vbTextCompare)
If TempPos > 0 Then
Pos(i) = Mid(Obj.Tag, StartPos, TempPos - StartPos)
StartPos = TempPos + 1
Else
Pos(i) = 0
End If

'根据控件的原始位置及窗体改变大小 的比例对控件重新定位与改变大小

Obj.Move Pos(0) * ScaleX, Pos(1) * ScaleY, Pos(2) * ScaleX, Pos(3) * ScaleY

Next i

Next Obj

On Error GoTo 0

End Sub

是借用了他们的代码，其他控件都可以改变大小，就combox不能改变，请大侠指教