Re: PreTranslateMessage and Ctrl + A

"Doug Harrison [MVP]" <>
Thu, 26 Jul 2007 07:47:23 -0500
On Thu, 26 Jul 2007 13:14:58 +0200, "Guido Franzke" <>

Ok, GetKeyState is < 0. I think I misunderstood the documentation.
VK_A does not exist, I regret. So I compared wParam with 'a', did not work,
with 'A', didn't work either. Other chars didn't work either.
The value is 65 that I must compare with. But I don't know why because 'a'
is ASCII 65. Do you know why?

No, I don't, because 'A' is the correct value to compare to. The value of
'A' is 65. The value of 'a' is 65+32 or 97.

Now this works well:

     if (pMsg->wParam==65 && GetKeyState(VK_CONTROL)<0)

Replace the 65 with 'A'. You must have done something else wrong if it
wasn't working before. And spaces are cheap! Use them:

      if (pMsg->wParam == 'A' && GetKeyState(VK_CONTROL) < 0)

            return TRUE;
   return CPropertyPage::PreTranslateMessage(pMsg);

Just another question. Is it ok to return TRUE instead of calling the base
class function?

If you don't want the base class to have any say in processing the message,
don't call it. For this function, it's perfectly reasonable not to call the
base class version.

Doug Harrison
Visual C++ MVP

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