Re: Prevent invalid chars in editbox

Eric Lilja <>
Fri, 20 Jul 2007 02:50:32 +0200
David Lowndes wrote:

Ah, I noticed that some of the "control keys" were not behaving as they
should so that's when it occured to me to redefine OnChar instead on
OnKeyDown. Problem solved.

Now try pasting something invalid into the control.


Bah, there are so many situations to worry about! :)

Anyway, I tried handling pastes but my problem is: what do I do when I
have a paste that consists of valid strings? I just want the CEdit base
class handle it's my code:

NumberEditBox::OnPaste(WPARAM wParam, LPARAM lParam)
    if (!IsClipboardFormatAvailable(CF_TEXT))
       TRACE0("OnPaste() called but CF_TEXT was not available.\n");

       return 0;


    HGLOBAL hdl = ::GetClipboardData(CF_TEXT);

    if (hdl == 0)
       DWORD error_code = ::GetLastError();
       TRACE1("GetClipboardData() failed: %i\n", error_code);
       const char *str = (const char *)::GlobalLock(hdl);

       if (!contains_invalid_char(str)
           // Valid paste..but how do I make it happen??



    return 0;

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