这个代码返回系统任务栏高度，以缇(twips)做单位，使用了SystemParametersInfo API函数。

Option Explicit

Public Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByRef lpvParam As Any, ByVal fuWinIni As Long) As Long
    Public Const SPI_GETWORKAREA = 48


Public Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Public Function GetTaskbarHeight() As Integer
    Dim lRes As Long
    Dim rectVal As RECT
   
    lRes = SystemParametersInfo(SPI_GETWORKAREA, 0, rectVal, 0)
    GetTaskbarHeight = ((Screen.Height / Screen.TwipsPerPixelX) - rectVal.Bottom) * Screen.TwipsPerPixelX
End Function