摘要
简要介绍了便携式导航仪产品的总体构架，重点介绍了便携式导航仪产品的多媒体播放功能，提出利用微软公司DirectShow技术实现媒体播放功能的开发思路，介绍了DirectShow技术的体系结构，设计并编写了多媒体播放功能软件的样例代码。
The framework and multimedia function of navigator, the Microsoft corporation newest directshow technology, and it＇s structure and the related technology are presented. The multimedia function based on directshow technology is developed, and the sample code is given.
