CONFIGURATION_INFORMATION structure (ntddk.h)

The CONFIGURATION_INFORMATION structure contains the overall system device configuration record.

Syntax

typedef struct _CONFIGURATION_INFORMATION {
  ULONG   DiskCount;
  ULONG   FloppyCount;
  ULONG   CdRomCount;
  ULONG   TapeCount;
  ULONG   ScsiPortCount;
  ULONG   SerialCount;
  ULONG   ParallelCount;
  BOOLEAN AtDiskPrimaryAddressClaimed;
  BOOLEAN AtDiskSecondaryAddressClaimed;
  ULONG   Version;
  ULONG   MediumChangerCount;
} CONFIGURATION_INFORMATION, *PCONFIGURATION_INFORMATION;

Members

DiskCount

Number of hard disks in the system thus far. A driver can use this number to determine the names of new disks. The driver should update this value as it finds new disks.

FloppyCount

Number of floppy disks in the system thus far. A driver can use this number to determine the names of new disks. The driver should update this value as it finds new disks.

CdRomCount

Number of CD-ROM drives in the system thus far. A driver can use this number to determine the names of new drives. The driver should update this value as it finds new drives.

TapeCount

Number of tape drives in the system thus far. A driver can use this number to determine the names of new drives. The driver should update this value as it finds new drives.

ScsiPortCount

Number of SCSI port adapters in the system thus far. A driver can use this number to determine the names of new SCSI port adapters. The driver should update this value as it finds new adapters.

SerialCount

Number of serial devices in the system thus far. A driver can use this number to determine the names of new serial devices. The driver should update this value as it finds new devices.

ParallelCount

Number of parallel devices in the system thus far. A driver can use this number to determine the names of new parallel devices. The driver should update this value as it finds new devices.

AtDiskPrimaryAddressClaimed

Boolean that indicates ownership of the 0x1F0-0x1FF space of the two I/O address spaces used by WD1003-compatible disk controllers.

AtDiskSecondaryAddressClaimed

Boolean that indicates ownership of the 0x170-0x17F space of the two I/O address spaces used by WD1003-compatible disk controllers.

Version

The version of this structure. Set to sizeof(CONFIGURATION_INFORMATION).

MediumChangerCount

Number of medium changer devices in the system. A driver can use this number to determine the names of new medium changer devices. The driver should update this value as it finds new devices.

Remarks

CONFIGURATION_INFORMATION can be used as follows:

• By drivers that are initializing to determine the number of devices of a particular type that have already been initialized.
• To track whether or not the AtDisk address range has already been claimed.
• By the **IoGetConfigurationInformation ** system service to return device type counts.

Requirements

See also

**IoGetConfigurationInformation ** (ntddk.h)

**IoGetConfigurationInformation ** (ntifs.h)