'This project needs a 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
Const GWL_STYLE = (-16)
Const ES_NUMBER = &H2000&
Public Sub SetNumber(NumberText As TextBox, Flag As Boolean)
Dim curstyle As Long, newstyle As Long
'retrieve the window style
curstyle = GetWindowLong(NumberText.hwnd, GWL_STYLE)
If Flag Then
curstyle = curstyle Or ES_NUMBER
Else
curstyle = curstyle And (Not ES_NUMBER)
End If
'Set the new style
newstyle = SetWindowLong(NumberText.hwnd, GWL_STYLE, curstyle)
'refresh
NumberText.Refresh
End Sub
Private Sub Form_Load()
SetNumber Text1, True
Me.Caption = "Now, try typing some letters into the textbox"
End Sub
