This paper studies IP multicast technology,WinSock control component programming theory and DirectSound firstly. Then it discusses implementation of real-time capture of sound and the design method of multicast in Visual C++6.0.

• 本文对IP组播技术、WinSock控件编程原理以及DirectSound对象进行了研究；探讨了在VisualC++6.；0环境中实现局域网音频的实时捕捉和组播传送的关键技术和方法。