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For all IOCTL requests except IOCTL_SMARTCARD_IS_ABSENT and IOCTL_SMARTCARD_IS_PRESENT, SmartcardDeviceControl (WDM) initializes the IoRequest member of the SMARTCARD_EXTENSION structure before it calls a callback routine. The following table indicates the sorts of initialization that SmartcardDeviceControl performs.
| Member of IoRequest | Initialization performed by SmartcardDeviceControl |
|---|---|
IoRequest.RequestBuffer |
Stores the user data to be sent to the card in the buffer that this member points to. |
IoRequest.RequestBufferLength |
Stores the length of the user buffer in this member. |
IoRequest.ReplyBuffer |
Stores the data returned by the smart card in the buffer that this member points to. |
IoRequest.ReplyBufferLength |
Stores the size of the reply buffer in this member. |
IoRequest.Information |
Stores the number of bytes that were actually received from the card in the variable that this member points to. |
MajorIoControlCode |
Stores the major I/O control code of the IOCTL request in this member. |
MinorIoControlCode |
Stores the minor I/O control code (if any) of the IOCTL request in this member. |
The structure pointed to by SmartcardExtension->OsData is set up as described in the following table.
| Member | Description |
|---|---|
CurrentIrp |
Receives a pointer to the requesting IRP for every control request except IOCTL_SMARTCARD_IS_ABSENT and IOCTL_SMARTCARD_IS_PRESENT. |
NotificationIrp |
Receives a pointer to the requesting IRP for the IOCTL_SMARTCARD_IS_ABSENT or IOCTL_SMARTCARD_IS_PRESENT control request. |