Re: PreTranslateMessage

From:

"vvf" <vvf@vvf.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 28 Aug 2009 12:07:35 +0300

Message-ID:

<OonrQ87JKHA.1252@TK2MSFTNGP04.phx.gbl>

Hi Dave,

Check for WM_CHAR first.
If it's one of those, then I've got an ASCII character. Handle it.

Then if it's a WM_KEYDOWN
Check to see if its an ASCII character.
If so just let it go to the base class, and I'll get it as WM_CHAR
eventually.
If not, handle it.

Dave

Thanks. I got it to work following your method although I'm not sure I
understand why it is working and if I'm doing things right.

Here is what I did:

I wanted to write a test and see if I can distinguish the VK_UP from regular
characters.

Here is the code:

if (pMsg->message == WM_CHAR)
{
   // it is a char
   return CStatic::PretranslateMessage(pMsg);
}

if (pMsg->messsage == WM_KEYDOWN)
{
   // check and see if it is ASCII
   if (pMsg->wParam >= 32 && pMsg->wParam <= 126 && pMsg->wParam != VK_UP)
   {
         // It is ASCII; Note: I noticed that VK_UP is defined as "38" and
somehow '&' in the ASCII table is also 38.
         // I don't understand how it can distinguish between the "&" and
VK_UP. It probably finds out later that this 38
         // refers to a VK_UP and not a char so it does not synthetise a
char, correct ?
         // If I leave out the pMsg->wParam != VK_UP, then my control never
catches VK_UP.

         CStatic::PreTranslateMessage(pMsg);
    }
    else
    {
        if (pMsg->wParam == VK_UP)
        {
               // User pressed the arrow up
         }
         return TRUE;
}
return CStatic::PretranslateMessage(pMsg);

Does it seem right? Thanks.

__________ Information from ESET NOD32 Antivirus, version of virus signature database 4376 (20090828) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com