'调用API取得除任务栏外的屏幕高度
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


'调用API得到整个屏幕高度
Private Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
Private Const SM_CXSCREEN = 0
Private Const SM_CYSCREEN = 1
Public Function GetSystemHeight() As Integer '取得屏幕高度
    GetSystemHeight = GetSystemMetrics(SM_CYSCREEN)
End Function


Public Function GetTaskbarHeight() As Integer '取得任务栏高度
    Dim lRes As Long
    Dim rectVal As RECT
    lRes = SystemParametersInfo(SPI_GETWORKAREA, 0, rectVal, 0)
    GetTaskbarHeight = GetSystemMetrics(SM_CYSCREEN) - rectVal.Bottom
End Function