3.1.4.5 SCARD_IOCTL_LISTREADERGROUPSA (IOCTL 0x00090020)
The ASCII version List Reader Groups returns the reader groups known to Smart Cards for Windows. ListReaderGroups_Return is constructed according to ListReaderGroups_Return and ListReaders_Return and the information in ListReaderGroups_Call.
Return Values: This method sets ListReaderGroups_Return.ReturnCode (for more information, see section 2.2.3.4) 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.