PC/SC接口包含30多个以Scard为前缀的函数，所有函数的原型都在winscard.h中声明，应用程序需要包含winscard.lib，所有函数的正常返回值都是SCARD_S_SUCCESS。在这30多个函数中，常用的函数只有几个，与智能卡的访问流程（图2）对应，下面将详细介绍这些常用函数。-PC/SC interface contains over 30 Scard prefix function, all functions of the prototype is declared in winscard.h, the application needs to contain winscard.lib normal return values ​ ​ of all functions are SCARD_S_SUCCESS. Over 30 functions, only a few of the commonly used functions, corresponding to the process (Figure 2) with smart card access these commonly used functions, detailed below.