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Preliminary User Guide, Rev. 2 USS-720
February 1999 USB Device Driver
Lucent Technologies Inc. 7-31
13
5 I/O Control Data Structures
This section describes the data structures used in I/O control codes.
5.1 DEVICE_INSTANCE_HEADER
The DEVICE_INSTANCE_HEADER structure is used when issuing the IOCTL_GET_DEVICE_INSTANCES con-
trol code.
5.1.1 Data Structure
typedef struct _DEVICE_INSTANCE_HEADER{
DWORD NumDeviceInstance;
DWORD TotalLength;
}DEVICE_INSTANCE_HEADER;
5.1.2 Members
NumDeviceInstance—Total number of device instances.
TotalLength—Total length (in bytes) of device instances including the header.
5.2 DEVICE_INSTANCE
The DEVICE_INSTANCE structure is used when issuing the IOCTL_GET_DEVICE_INSTANCES control code.
5.2.1 Data Structure
typedef struct _DEVICE_INSTANCE{
DWORD InstanceIndex;
DWORD LinkNameLength;
CHAR DeviceLinkName[64];
}DEVICE_INSTANCE, *PDEVICE_INSTANCE;
5.2.2 Members
InstanceIndex—Index of this instance.
LinkNameLength—Length (in bytes) of the DeviceLinkName.
DeviceLinkName—Pointer to a null terminated string containing the symbolic link name of a device instance.