Visual C++的CBitmap类和静态图片控件的功能是比较弱的，它只能显示出在资源中的图标、位图、光标以及图元文件的内容，而不像VB中的Image控件可以显示出绝大多数的外部图像文件(BMP、GIF、JPEG等)。因此，想要在对话框或其他窗口中显示外部图像文件则只能借助于第三方提供的控件或代码。 现在，MFC和ATL共享的新类CImage为图像处理提供了许多相应的方法.-The Visual C++ class CBitmap and static picture control function is weak, it can only show in a resource, bitmap, cursor and icon metafile contents, rather than VB in Image control can display the external image files most (BMP, GIF, JPEG etc.). Therefore, to show the external image files only with control or code provided to the third party in the dialog box or other window. Now, a new class of CImage MFC and ATL sharing provides a number of the corresponding method for image processing.