comctl32: theming "framework"

Alexandre Julliard julliard at
Mon Jul 25 03:06:40 CDT 2005

Frank Richter <frank.richter at> writes:

> On 16.07.2005 01:13, Frank Richter wrote:
> > Frank Richter <frank.richter at>
> > Added some generic code to allow subclassing(for the purpose of theming)
> > of standard controls.
> What are the issues with this one?

I don't think you should store information in the class/window extra
data, since you have no way of knowing what offset to use. Basing the
offset on the total number of allocated bytes will break if someone
creates a new subclass with more extra data.

Alexandre Julliard
julliard at

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