IOCTL_SMARTCARD_POWER

WDM driver version

The IOCTL_SMARTCARD_POWER request consists of three minor IOCTL codes listed in the following table.

Code	Meaning
SCARD_COLD_RESET	Power down the card and power it up again.
SCARD_WARM_RESET	Perform a warm reset of the card.
SCARD_POWER_DOWN	Switch off the card power.

Irp->AssociatedIrp.SystemBuffer: Contains the minor IOCTL code.
Parameters.DeviceIoControl.OutputBufferLength: The size of the output buffer. Must be at least 33 bytes to hold the answer to request (ATR) data. (Does not apply to power down code.)

Irp->AssociatedIrp.SystemBuffer: Used by SCARD_COLD_RESET and SCARD_WARM_RESET to store the ATR data coming from the card.

Information is set to the length of the ATR returned by the card. Status is set to one of the following values.

Status	Meaning
STATUS_SUCCESS	Successful operation.
STATUS_UNRECOGNIZED_MEDIA	Unknown or unsupported card inserted.
STATUS_NO_MEDIA	No card is in the reader.
STATUS_IO_TIMEOUT	The operation has timed out.

Defined in winsmcrd.h. Include winsmcrd.h.

The IOCTL_SMARTCARD_POWER request consists of three minor IOCTL codes listed in the following table.

Code	Meaning
SCARD_COLD_RESET	Power down the card and power it up again.
SCARD_WARM_RESET	Perform a warm reset of the card.
SCARD_POWER_DOWN	Switch off the card power.

DiocParams->lpvInBuffer: Contains the minor IOCTL code.
DiocParams->cbOutBuffer: The size of the output buffer. Must be at least 33 bytes to hold the answer to reset (ATR) data.

DiocParams->lpvOutBuffer: Used by SCARD_COLD_RESET and SCARD_WARM_RESET to store the ATR coming from the card.
DiocParams->lpcbBytesReturned: Must be set to the length of the ATR returned by the card. (Does not apply to power down code.)

Following are possible status values.

Value	Meaning
STATUS_SUCCESS	Successful operation.
STATUS_UNRECOGNIZED_MEDIA	Unknown or unsupported card inserted.
STATUS_NO_MEDIA	No card is in the reader.
STATUS_IO_TIMEOUT	The operation has timed out.

Defined in winsmcrd.h. Include winsmcrd.h.