Petzold's programming windows if you can find a copy.
All the win32 gui stuff is still there underneath MFc/Winforms etc.
http://www.charlespetzold.com/pw5/index.html
edit - as somebody mentioned, the win32 api is purely 'C' as are all the examples in Petzold. This doesn't really matter if you are calling them from C++ except that you will have to understand regular C strings.
