基于VC++环境的ComGIS开发初探

The Preliminary Discussion on Development of ComGIS Based on VC++

ComGIS也称组件式地理信息系统,是指由一组遵循COM(组件对象模型)“工业标准”的,基于组件对象平台的,允许跨语言应用甚至跨计算机交互的组件提供的GIS,各GIS组件之间可通过标准的通信接口实现互操作,目前它已经成为地理信息系统软件发展的新潮流。VisualC++简称VC,是微软公司推出的一个面向对象的、功能丰富的可视化重量级的开发工具。在目前流行的VisualC++,VisualBasic,Delphi等众多开发工具中,其功能最为强大。但目前对于在VC++环境下如何开发组件式地理信息系统的研究却很少。该文以VC++6.0开发环境和MapObjects2.0为例,采用西北干旱区典型的内陆河石羊河流域的地图数据,探讨了在VC++环境中地理信息系统组件的嵌入、地理信息系统基本功能如图形的放大、漫游以及图形显示的恢复等基本问题,进而为开发基于VC++环境的组件式地理信息系统提供参考和依据。

ComGIS is components geographic information systems.It is composed of a group of GIS components which conform to the“technical criterion”of COM(Component Object Model)and is based on the platform of component objects and may be applied to all programming languages,furthermore all various computers.One GIS component may communicate with another through the standard communication interfaces.At present ,it is a mainstream in GIS technology.Visual C++,in a word,is VC.It is the heavyweight of programming language by Microsoft corporation with sufficient functions,object oriented and visual.It is the most powerful one of popular programming languages at present ,such as Visual C++,Visual Basic and Delphi.But the research on the development of ComGIS is very scarce in VC++programming language.The paper gives an example of the development of ComGIS in VC++.The map data is from the ShiYanghe riverbasin which is a typical inland riverbasin in northwestern region in China.The fundmental functions of GIS,such as built -in of GIS components,zoom,pan and refreshing of a map and so on have been discussed.The research in the paper gives scientific and referenced bases for the development of ComGIS based on VC++.