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Subject: Re: Length of Window extra bytes.
From: Chris Johns
Date: Tue, 18 Jan 2000 12:45:24 +1100

Greg Haerr wrote:
> 
> : To make sure I understand this I will outline what I will do :
> :
> :  In `class WindowClass' I add sizeof (class Window*) to
> :  the extra bytes supplied by the user. The user of
> :  `class Window' must use a window class created by
> :  the WindowClass class.
> :
> :  When creating a window fill in a CREATESTRUCT and pass in
> :  the first parameter of the CreateWindowEx function.
> :
> :  Filter the WM_CREATE and take the object pointer from
> :  the CREATESTRUCT and set in the extra bytes.
> :
> :  Use the extra bytes to get the object pointer.
> :
> : This makes the only change I need the macro I posted earlier plus the
> : code to set a long word.
> 
> You only need the code to set a long word.  Your
> earlier macro gets the length of extra bytes, it's not needed.
> 

Yes you are correct. Sorry about that.

I have also noticed that the header files are not protected against C++.
Should I add the:

extern "C"
{

};

etc to the header files ?

-- 
 Chris Johns, mailto:ccj@acm.org

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