Subclassing TextBox

[nishantp]

Could someone point me to an example of subclassing a textbox? For instance, so it will block pastes, and allow only numbers. how would that be done? I know there is code to do it easily, but i would like to learn Subclassing. thanks.

[vbgladiator]

Just do a search on subclassing.

It is bound to return enough material for hours to read.

The topic of subclassing has been mentioned countless times on this forum.

[donW]

just replyed to brianh about this!
simple API to force a textbox to #'s only:
(but can still paste anything into into, sorry)

[code]Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Const GWL_STYLE = (-16) 'ALTER TEXTBOX STYLES:
Public Const ES_NUMBER = &H2000 '#'S ONLY
Public Const ES_UPPERCASE = &H8& 'uppercase all
Public Const ES_PASSWORD = &H20 'stars only
'example:
'I = GetWindowLong(TXTpanel(0).hwnd, GWL_STYLE)
'r (long) = SetWindowLong(Text1.hwnd, GWL_STYLE, l Or ES_NUMBER)

[Nucleus]

good explanation here:


http://forums.vb-world.net/showthrea...threadid=35186