Filter
Top Products
Preliminary User Guide, Rev. 2 USS-720
February 1999 USB Device Driver
Lucent Technologies Inc. 7-19
13
4 I/O Control Codes (continued)
4.10 IOCTL_GET_CAPABILITIES
IOCTL_GET_CAPABILITIES returns a variable buffer length containing the device capabilities string. This is an
IEEE
1284 compatible string. Details regarding parameters and error codes follow.
4.10.1 Parameters
lpInBuffer—Points to an input buffer. 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 an
IEEE
1284 Device ID string.
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 or
returns the length of the Device ID string if nOutBufferSize is zero.
4.10.2 Notes
None.
4.10.3 Error Codes
ERROR_NOT_ENOUGH_BUFFER—lpOutBuffer was not large enough to receive the Device ID string (see
USS-
720 USB-to-
IEEE
1284 Bridge
Preliminary Data Sheet, “Printer Class-Specific Requests”).
STATUS_INSUFFICIENT_RESOURCES—Not enough memory to perform the request on this device instance.