Re: Why CreateCompatibleDC and CreateCompatibleBitmap?

"hawkgao" <hawkgao-/[email protected]> wrote in
message news:[email protected]
> 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?

Compatible with the other HDC you are passing in as a parameter. As in, 
having the same resolution, color depth and so on.

> why windows cannot draw directly on
> device?

Can too. You don't have to call these functions, you can draw directly 
onto the device DC.
-- 
With best wishes,
    Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not 
necessarily a good idea. It is hard to be sure where they are going to 
land, and it could be dangerous sitting under them as they fly 
overhead. -- RFC 1925 





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