SUB_Q_CURRENT_POSITION structure (ntddcdrm.h)
The SUB_Q_CURRENT_POSITION structure contains position information and is used in conjunction with SUB_Q_CHANNEL_DATA.
Syntax
typedef struct _SUB_Q_CURRENT_POSITION {
SUB_Q_HEADER Header;
UCHAR FormatCode;
UCHAR Control : 4;
UCHAR ADR : 4;
UCHAR TrackNumber;
UCHAR IndexNumber;
UCHAR AbsoluteAddress[4];
UCHAR TrackRelativeAddress[4];
} SUB_Q_CURRENT_POSITION, *PSUB_Q_CURRENT_POSITION;
Members
Header
Indicates, among other things, the length of the Q subchannel data that was retrieved. See SUB_Q_HEADER for more details.
FormatCode
Should have a value of IOCTL_CDROM_CURRENT_POSITION.
Control
Defines various types of information within the table of contents lead-in area. For more information about the permissible values for this member, see specification T10/1363-D, by National Committee for Information Technology Standards (NCITS).
ADR
Indicates the type of information encoded in the Q subchannel of the block. For information about the permissible values for this member, see specification T10/1363-D, by National Committee for Information Technology Standards (NCITS).
TrackNumber
Contains the current track number.
IndexNumber
Contains the current index number.
AbsoluteAddress[4]
Gives the current location relative to the logical beginning of the media. The bytes in this array are arranged in big-endian order. AbsoluteAddress[0] contains the most significant byte, and AbsoluteAddress[3] contains the least significant byte.
TrackRelativeAddress[4]
Gives the current location relative to the logical beginning of the current track. The bytes in this array are arranged in big-endian order. TrackRelativeAddress[0] contains the most significant byte, and TrackRelativeAddress[3] contains the least significant byte.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddcdrm.h (include Ntddcdrm.h) |