本例实现了一个简单的绘工具，该绘图工具具有打开，关闭，保存，另存文件的功能；它能够对直线，矩形等几种图元进行绘制和操作。本章主要介绍了视图文档的程序框架的应用，创建工具条，使用设备环境变量的各种绘制功能，使用设备环境变量的不同绘制模式，实现文件的流式存储与加载功能等。-the cases to achieve a simple painting tool, the graphics tools with open and closed, preservation, Save document functions; It is capable of linear, rectangular, etc. Several map yuan for mapping and operation. This chapter introduces the Document View the procedural fr a mework of the applications, create tools, equipment use environment variables in the various functional mapping, the use of equipment of different environmental variables mapping models and document flow storage and loading capabilities.