Abstract
Component technology pushed object\|oriented technology and distributed calculation efficiently, and then advanced software development. ActiveX control has been the standard of component technology of microsoft. This article began with the component technology, then introduce a GIS ActiveX control Mapobjects 1.2, and analyses its mechanism. Based on the application environment information system of Dunhuang and surrounding area, the authors analyse some detailed questions and present the solutions. In this system, we tried to display overlaid different coverage by displaying coverages we chose. To display vector shape and label text in several levels, we added some control field in the attribute table that was bounded to vector shape file. We decorate Chinese symbols displaying by relating map scale to Chinese font size. In addition, the authors presented some appreciation dealing with the error and packing and distributing of application.
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