一个叫"CPicture"的类来封装IPicture。CPicture将一些麻烦的COM类型的参数映射为那些更容易被MFC程序员接受的类型，在CPicture里，你可以控制按一定比率放大、缩小，甚至你图片自适应窗口的大小-Called " CPicture"　class to encapsulate IPicture. CPicture some of the troubles of the COM type parameter is mapped to MFC programmers who are more likely to be type accepted in CPicture, you can control by a certain percentage of zoom, and even the size of your image adaptive window