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调用该控件的方法。-This article describes how to develop an ActiveX control, to provide interfaces to link with the corresponding event. Man

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这是一个读卡器上位机人机界面交互测试程序.对熟悉PC/SC编程狠有帮助.-This is a card reader place of honor machine man-machine interface to hand over to test procedure with each other.It is malicious to do good towards acquainting with PC| SC plait distance.