WTL学习（1）

总的看法：WTL（windows  Template Libary）是一组基于ATL的扩展类库用来支持更加复杂的应用程序，或者UI组件的用户接口，同时保留了ATL的编码短小和执行快速的的特性。 WTL可以更好和更快的的执行大量的Win32下的UI的用来支持ATL的应用程序和，服务，组件，和控件

 WTL provides support for implementing various user interface elements, from frame and popup windows, to MDI, standard and common controls, common dialogs, property sheets and pages, GDI objects, UI updating, scrollable windows, splitter windows, command bars, etc. The WTL classes are mostly templated and use minimal instance data and inline functions. They were not designed as a framework, so they do not impose a particular application model, and can accommodate any. The classes do not use hooks or thread local storage, so they have no restrictions that those techniques impose. They also have no inter-dependencies and can be freely mixed with straight SDK code. In summary, WTL delivers very small and efficient code, very close in size and speed to SDK programs, while presenting a more logical, object oriented model to a programmer.