B18
代码说明：
E:Visual_C__MFC扩展编程实例 例18 动态地抓取应用程序的屏幕图像并将其打印。 上一个实例打印的是文档的报表，而不是当前出现在屏幕上的内容。在本例中，将实现 屏幕抓取并打印其内容。M F C 为打印视提供了有限的支持， 但只要用M F C 在 C Vi e w : : O n D r a w ( )中所提供的设备环境，就可以绘制自己的视。在打印视的时候， M F C只需调 用具备打印机设备环境的O n D r a w ( )函数即可。但是，如果不绘制自己的视，例如，用一个或 者一个以上的控件窗口填充自己的视就不会打印任何东西。每个控件将使用自己的设备环境 将自己打印到屏幕，因此打印视的唯一途径就是抓取屏幕(拷贝其内容到一个位图对象)并将其 打印到打印机。由于该功能整个与位图相关，因此将该功能封装到了位图类中。(E : Visual_C__MFC expand programming examples cases 18 crawls dynamic application's screen images and their Print. Print example, a document is a statement, rather than the current appeared on the screen content. In this case, to achieve the screen crawls and print its contents. M F C Print, as provided limited support, but as long as M F C in C Vi e w : : O r a n D. w (), which provided the equipment environment, we can draw our own consideration. In Print, as when M F C only with the printer device called the environment O D r a n w () function can be. However, if we do not draw their attention, for example, or one with a control over their windows filled as it will not print anything. Controls will use their own equipment to their environment to Print Screen, Therefore, as Print i)
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