windows下smartcard reader的调用流程讨论

下面是我在我的Smartcardf Reader驱动中所跟踪得驱动IO调用过程

做过的帮助解释一个问题，系统为什么会调用IOCTL_SMARTCARD_IS_ABSENT这个IO？
我的卡是一直存在的啊

Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_IS_PRESENT
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_SET_ATTRIBUTE
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_IS_ABSENT
Enter IOCTL_SMARTCARD_IS_PRESENT
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_IS_ABSENT
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_IS_PRESENT
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_IS_ABSENT
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_IS_PRESENT
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_POWER
Enter IOCTL_SMARTCARD_GET_STATE
Enter IOCTL_SMARTCARD_GET_ATTRIBUTE
Enter IOCTL_SMARTCARD_IS_ABSENT

你好！我觉得你的SMARTCARD DRIVER 已经OVER了，但我的刚完，且我不知道调用ScardConnect不能进入我的DRIVER，希望Help Me?谢谢！！

你这些跟踪到的信息是在什么情况下产生的，你同时在做什么操作