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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Jun 19, 1999

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Application Security Testing: An Integral Part of DevOps


ForceTextBoxNumeric - Create a numeric Textbox

Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

' Force a TextBox control to accept only numeric digits
' Cancel the effect by passing Force = False
'
' Note that it only accepts positive integer values

Sub ForceTextBoxNumeric(TextBox As TextBox, Optional Force As Boolean = True)
    Dim style As Long
    Const GWL_STYLE = (-16)
    Const ES_NUMBER = &H2000
    
    ' get current style
    style = GetWindowLong(TextBox.hWnd, GWL_STYLE)
    If Force Then
        style = style Or ES_NUMBER
    Else
        style = style And Not ES_NUMBER
    End If
    ' enforce new style
    SetWindowLong TextBox.hWnd, GWL_STYLE, style
End Sub

Marco Losavio
 
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