Re: Prevent invalid chars in editbox

"Tom Serface" <>
Thu, 19 Jul 2007 17:52:18 -0700
There are a lot of "mask edit controls" here that might either already work
for you or give you some ideas about how to do just about anything you might


"Eric Lilja" <> wrote in message

Hello, I have an editbox in a dialog where the user is only allowed to
enter integers. However, I cannot simply set the number flag in the
resource editor because the user must be able to enter negative integers
too. Therefore, I didn't create it with that flag. Instead I subclassed
CEdit and redefined OnKeyDown():

NumberEditBox::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
   static const std::string valid_chars = "0123456789-";

   if (valid_chars.find(nChar) != std::string::npos)
      TRACE1("%c is a valid char\n", (char)nChar);
      CEdit::OnKeyDown(nChar, nRepCnt, nFlags);

This is basically the only code in my NumberEditBox class, no other member
functions have been introduced or redefined by me.

When the program is run, I only see traces of the valid chars, however the
invalid ones still appear in the editbox itself. What else do I need to
do? I was suprised that not letting the CEdit do anything for the unwanted
chars was not enough.

I'm using MSVC++ 8.0 SP1 on WinXP Pro SP2.

- Eric

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