3.1.4.27 SCARD_IOCTL_CANCEL (IOCTL 0x000900A8)
The Cancel method MUST instruct Smart Cards for Windows to cancel any outstanding calls by using the context specified by Context_Call.Context (for more information, see section 2.2.2.2).
Return Values: The method sets Long_Return.ReturnCode (for more information, see section 2.2.3.3) to SCARD_S_SUCCESS on success; otherwise, it sets one of the smart card-specific errors or one of the return codes from Winerror.h. No specialized error codes are associated with this method.