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7-22 Lucent Technologies Inc.
USS-720 Preliminary User Guide, Rev. 2
USB Device Driver February 1999
13
4 I/O Control Codes (continued)
4.13 IOCTL_GET_DEVICE_INSTANCES
IOCTL_GET_DEVICE_INSTANCES returns a list of current devices based on the symbolic links created during
each device enumeration. Details regarding parameters and error codes follow.
4.13.1 Parameters
lpInBuffer—Points to an input buffer that will receive. Not used with this operation. Set to NULL.
nInBufferSize—Specifies the size (in bytes) of the buffer pointed to by lpInBuffer. Not used with this operation. Set
to zero.
lpOutBuffer—Points to an output buffer that will receive a DEVICE_INSTANCE_HEADER structure (see
Section 5.1) and a series of DEVICE_INSTANCE structures (see Section 5.2), one for each device instance.
nOutBufferSize—Specifies the size (in bytes) of the buffer pointed to by lpOutBuffer. Specify zero to return only the
length of the Device ID string in lpBytesReturned.
lpBytesReturned—Points to a DWORD that receives the actual size (in bytes) of the data stored into lpOutBuffer.
4.13.2 Notes
None.
4.13.3 Error Code
ERROR_NOT_ENOUGH_BUFFER—lpOutBuffer needs to be large enough to receive the device instances.