说明：  本文主要介绍如何开发一个ActiveX控件，提供接口，与相应事件挂钩。文中涉及到VARIANT，SAFEARRAY，BSTR的详细使用方法。另外还提供了WinSock的详细开发步骤，以及如何响应网络超时，网络断开的事件方法以及在VC，VB调用该控件的方法。
(This article describes how to develop an ActiveX control, interface, and linked with the corresponding event. Involved in the VARIANT, SAFEARRAY, BSTR use. Also WinSock detailed development steps, and how to respond to a network timeout, disconnected from the network event and call the control in VC, VB.)