Funções de classe de janela
- GetClassInfo
- GetClassInfoEx
- GetClassLong
- GetClassLongPtr
- GetClassName
- GetClassWord
- GetWindowLong
- GetWindowLongPtr
- RegisterClass
- RegisterClassEx
- SetClassLong
- SetClassLongPtr
- SetClassWord
- SetWindowLong
- SetWindowLongPtr
- UnregisterClass