IOCTL_HID_GET_DEVICE_DESCRIPTOR IOCTL (hidport.h)

The IOCTL_HID_GET_DEVICE_DESCRIPTOR request obtains a HIDClass device's HID descriptor.

For general information about HIDClass devices, see HID Collections.

Major code

IRP_MJ_DEVICE_CONTROL

Input buffer

Parameters.DeviceIoControl.OutputBufferLength contains the length of the system-resident buffer provided at Irp->UserBuffer.

Input buffer length

The size of OutputBufferLength.

Output buffer

The HID minidriver returns the device descriptor in the user buffer at Irp->UserBuffer.

Output buffer length

The size of the device descriptor.

Status block

HID minidrivers that carry out the I/O to the device set the following fields of Irp->IoStatus:

• Information is set to the number of bytes transferred from the device.
• Status is set to STATUS_SUCCESS if the transfer completed without error. Otherwise, it is set to an appropriate NTSTATUS error code.

HID minidrivers that call other drivers with this IRP to carry out the I/O to their device should ensure that the Information field of the status block is correct and not change the contents of the Status field.

Requirements

Requirement	Value
Header	hidport.h (include Hidport.h)

See also

IOCTL_GET_PHYSICAL_DESCRIPTOR

IOCTL_HID_GET_DEVICE_ATTRIBUTES

IOCTL_HID_GET_REPORT_DESCRIPTOR