` Limiting number of characters entered in a field (Larry Sand ) - Icetips Article
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Par2: Limiting number of characters entered in a field
2006-12-15 -- Larry Sand
 
If you want to limit the text box to n characters you can send it the Edit Message: EM_LIMITTEXT Like this: SendMessage(hWndText, EM_LIMITTEXT, nTextLimit, 0) hWndText is the handle to the text box, ?textbox{Prop:Handle} EM_LIMITTEXT EQUATE(00C5h) nTextLimit is the number of characters. This does not require that you subclass the text box. If you want to know the number of characters as they're typed you can subclass the control and watch for the Edit Notification message EN_CHANGE. Edit notification messages are sent in a WM_COMMAND message.

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