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/*++ BUILD Version: 0001 // Increment this if a change has global effects
Copyright (c) 1990-1993 Microsoft Corporation
Module Name:
ntddbeep.h
Abstract:
This is the include file that defines all constants and types for
the beep device.
Author:
Lee A. Smith (lees) 02-Aug-1991.
Revision History:
--*/
#ifndef _NTDDBEEP_
#define _NTDDBEEP_
//
// Device Name - this string is the name of the device. It is the name
// that should be passed to NtOpenFile when accessing the device.
//
// Note: For devices that support multiple units, it should be suffixed
// with the Ascii representation of the unit number.
//
#define DD_BEEP_DEVICE_NAME "\\Device\\Beep"
#define DD_BEEP_DEVICE_NAME_U L"\\Device\\Beep"
//
// NtDeviceIoControlFile IoControlCode values for this device.
//
// Warning: Remember that the low two bits of the code specify how the
// buffers are passed to the driver!
//
#define IOCTL_BEEP_SET CTL_CODE(FILE_DEVICE_BEEP, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)
//
// NtDeviceIoControlFile OutputBuffer record structures for
// IOCTL_BEEP_SET.
//
typedef struct _BEEP_SET_PARAMETERS {
ULONG Frequency;
ULONG Duration;
} BEEP_SET_PARAMETERS, *PBEEP_SET_PARAMETERS;
#define BEEP_FREQUENCY_MINIMUM 0x25
#define BEEP_FREQUENCY_MAXIMUM 0x7FFF
#endif // _NTDDBEEP_
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