How to subclass a CWnd window?

[Igor Jarm]

Hi all,

I would like to subclass (or Attach) a CWnd owned window to my CWnd derived
class.
So far I was able to crash consistently due to
ASSERT(FromHandlePermanent(hWndNew) == NULL);
related problem.

Is there a way for two CWnd objects to coexist on one window handle?
It has to be done this way because of a rather large library so rewriting it
isn't an option.

Thanks in advance.

Igor

[Ajay Kalra]

Thats a MFC limitation. Unforturnately you cannot do it. However, the
popular CSubClassWnd by Paul Dilascia will do what you want. You can search
for it in back issues of MSJ: www.microsoft.com/msj. Following example in
MSJ uses it:

http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0199/c++/c++0199.htm

--
Ajay Kalra [MVP - VC++]
ajay...@yahoo.com

"Igor Jarm" <NOigor....@siol.net> wrote in message
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[Igor Jarm]

"Ajay Kalra" <ajay...@yahoo.com> wrote in message
news:eLTbyt7pCHA.2460@TK2MSFTNGP12...

> Thats a MFC limitation. Unforturnately you cannot do it. However, the
> popular CSubClassWnd by Paul Dilascia will do what you want. You can
search
> for it in back issues of MSJ: www.microsoft.com/msj. Following example in
> MSJ uses it:
>
>
http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0199/c++/c++0199.htm
>
> --
> Ajay Kalra [MVP - VC++]
> ajay...@yahoo.com

Thanks a lot Ajay, this works fine and is a good substitute for
CWnd::SubclassWindow.
Is there an easy way to transfer CWnd message mapping to CSubClassWnd or is
it better to just rewrite it?

Thanks again.

Igor Jarm

[Ajay Kalra]

Actually you will get all the messages before the CWnd object gets it. You
dont have to rewrite anything. Just capture the messages you want in your
own window procedure. Example I mentioned shows how to do it.

--
Ajay Kalra [MVP - VC++]
ajay...@yahoo.com

"Igor Jarm" <NOigor....@siol.net> wrote in message

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