The IOCTL_HID_GET_DEVICE_DESCRIPTOR request obtains a HIDClass device's HID descriptor.
For general information about HIDClass devices, see HID Collections.
Parameters.DeviceIoControl.OutputBufferLength contains the length of the system-resident buffer provided at Irp->UserBuffer.
Input Buffer Length
The size of OutputBufferLength.
The HID minidriver returns the device descriptor in the user buffer at Irp->UserBuffer.
Output Buffer Length
The size of the device descriptor.
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.
|Header||hidport.h (include Hidport.h)|