VB - Bildschirmaktualisierungsrate ermitten

Private Function GetDisplayFrequency(ByVal Computer As String) As String

        Dim objWMIService As Object
        Dim objItems As Object
        Dim objItem As Object

        GetDisplayFrequency = ""
        objWMIService = GetObject("winmgmts:\\" & Computer & "\root\CIMV2")
        objItems = objWMIService.ExecQuery("SELECT * FROM Win32_DisplayConfiguration")
        For Each objItem In objItems
            GetDisplayFrequency = objItem.DisplayFrequency
        Next

        objWMIService = Nothing
        objItems = Nothing
        objItem = Nothing

    End Function