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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Oct 13, 2001



Application Security Testing: An Integral Part of DevOps

Determine whether a control has a scrollbar

There is no built-in VB function that lets you know whether a control - such as a ListBox - is currently displaying a vertical scrollbar. Here's a pair of functions that check the control's style bits and return a Boolean that tells if a vertical or horizontal scrollbar is visible:

Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
    (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Const GWL_STYLE = (-16)
Const WS_VSCROLL = &H200000
Const WS_HSCROLL = &H100000

Function HasHorizontalScrollbar(ctrl As Control) As Boolean
    HasHorizontalScrollbar = (GetWindowLong(ctrl.hwnd, _
End Function

Function HasVerticalScrollbar(ctrl As Control) As Boolean
    HasVerticalScrollbar = (GetWindowLong(ctrl.hwnd, GWL_STYLE) And WS_VSCROLL)
End Function
Using these functions is easy:

If HasVerticalScrollBar(List1) Then
    ' List1 is displaying a vertical scrollbar
End If
Francesco Balena
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