Re: PreTranslateMessage is not called in CMessageFilter and CEdit derived class

"izm_ka" wrote:
> Maybe this question has been answered somewhere on forums, but I could
> not find. Basically, I want to filter chars in the in-place edit box to 
> allow
> entering only digits (for integer).

As already mentioned, there is the ES_NUMBER style, though it doesn't 
support signed numbers or hexadecimal.

> I thought that PreTranslateMessage can help, but the method is never 
> called.

You don't need a message filter - just handle the WM_CHAR message. Here is 
how I restrict input to hexadecimal digits:

class CHexEdit :
    public CWindowImpl<CHexEdit, CEdit>
{
    BEGIN_MSG_MAP_EX(CMainDlg)
        MSG_WM_CHAR(OnChar)
    END_MSG_MAP()

    void OnChar(TCHAR ch, UINT, UINT)
    {
        // Allow hex digits and backspace.
        if ((VK_BACK == ch) ||
            _tcschr(_T("0123456789ABCDEFabcdef"), ch))
        {
            SetMsgHandled(FALSE);
            return;
        }
        MessageBeep(0);
    }
};

Note that invalid characters can still be pasted into the edit control. 
You'll have to take additional steps if you want to prevent that.

- Jim 



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