Re: Why CreateCompatibleDC and CreateCompatibleBitmap?

I've read 'windows programming'. i didn't find any chapter cover the details of CreateCompatible*. Could you provide the link to the articles you mentioned on MSDN.

--- In [email protected], "Roel Vanhout" <rvanhout@...> wrote:
>
>  
> You only need the CreateCompatible* calls when you're doing double
> buffering, i.e. drawing onto an offscreen (in memory) bitmap first, then
> blitting it to the window's DC, to avoid flicker. If you're using a
> CPaintDC in your WTL WM_PAINT handler, you *can* draw directly on that.
>  
> 'Compatible' refers to 'having the same properties' (color depth,
> palette, ...) as the original DC. What the CreateCompatible* calls do
> exactly is a long and complicated topic. I suggest reading the Petzold
> for an accessible (in asfar as an intricate topic like this can be made
> accessible) explanation. MSDN has the information too but IMO it's too
> dense to be fully understood by a novice.
>  
>  
> cheers,
>  
> roel
>  
> 
> 
>   _____  
> 
> From: [email protected] [mailto:[email protected]] On Behalf Of
> hawkgao
> Sent: Thursday, April 16, 2009 11:29
> To: [email protected]
> Subject: [wtl] Why CreateCompatibleDC and CreateCompatibleBitmap?
> 
> 
> 
> 
> 
> I've study windows programming 8 years ago. but, i even don't understand
> why windows need CreateCompatibleDC and CreateCompatibleBitmap, when
> drawing some thing on view. what is the "compatible" real meaning here?
> why windows cannot draw directly on device?
> 
> Thanks,
> -Hawk
> 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>




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