_URB_CONTROL_GET_INTERFACE_REQUEST structure (usb.h)
The _URB_CONTROL_GET_INTERFACE_REQUEST structure is used by USB client drivers to retrieve the current alternate interface setting for an interface in the current configuration.
Syntax
struct _URB_CONTROL_GET_INTERFACE_REQUEST {
struct _URB_HEADER Hdr;
PVOID Reserved;
ULONG Reserved0;
ULONG TransferBufferLength;
PVOID TransferBuffer;
PMDL TransferBufferMDL;
struct _URB *UrbLink;
struct _URB_HCD_AREA hca;
UCHAR Reserved1[4];
USHORT Interface;
USHORT Reserved2;
};
Members
Hdr
Pointer to a _URB_HEADER structure that specifies the URB header information. Hdr.Function must be URB_FUNCTION_GET_INTERFACE, and Hdr.Length must equal sizeof(_URB_CONTROL_GET_INTERFACE_REQUEST).
Reserved
Reserved. Do not use.
Reserved0
Reserved. Do not use.
TransferBufferLength
Must be 1. This member specifies the length, in bytes, of the buffer specified in TransferBuffer or described in TransferBufferMDL. The host controller driver returns the number of bytes sent to or read from the pipe in this member.
TransferBuffer
Pointer to a resident buffer for the transfer or is NULL if an MDL is supplied in TransferBufferMDL. The bus driver returns a single byte specifying the index of the current alternate setting for the interface.
TransferBufferMDL
Pointer to an MDL that describes a resident buffer or is NULL if a buffer is supplied in TransferBuffer. The bus driver returns a single byte specifying the index of the current alternate setting for the interface. This MDL must be allocated from nonpaged pool.
UrbLink
Reserved. Do not use.
hca
Reserved. Do not use.
Reserved1[4]
Reserved. Do not use.
Interface
Specifies the device-defined index of the interface descriptor being retrieved.
Reserved2
Reserved. Do not use.
Remarks
The reserved members of this structure must be treated as opaque and are reserved for system use.
Requirements
| Requirement | Value |
|---|---|
| Header | usb.h (include Usb.h) |