71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
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/*++ BUILD Version: 0001 // Increment this if a change has global effects
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Copyright (c) Microsoft Corporation. All rights reserved.
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Module Name:
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ntddbeep.h
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Abstract:
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This is the include file that defines all constants and types for
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the beep device.
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Author:
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Lee A. Smith (lees) 02-Aug-1991.
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Revision History:
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--*/
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#ifndef _NTDDBEEP_
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#define _NTDDBEEP_
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#if _MSC_VER > 1000
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#pragma once
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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//
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// Device Name - this string is the name of the device. It is the name
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// that should be passed to NtOpenFile when accessing the device.
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//
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// Note: For devices that support multiple units, it should be suffixed
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// with the Ascii representation of the unit number.
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//
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#define DD_BEEP_DEVICE_NAME "\\Device\\Beep"
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#define DD_BEEP_DEVICE_NAME_U L"\\Device\\Beep"
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//
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// NtDeviceIoControlFile IoControlCode values for this device.
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//
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// Warning: Remember that the low two bits of the code specify how the
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// buffers are passed to the driver!
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//
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#define IOCTL_BEEP_SET CTL_CODE(FILE_DEVICE_BEEP, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)
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//
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// NtDeviceIoControlFile OutputBuffer record structures for
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// IOCTL_BEEP_SET.
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//
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typedef struct _BEEP_SET_PARAMETERS {
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ULONG Frequency;
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ULONG Duration;
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} BEEP_SET_PARAMETERS, *PBEEP_SET_PARAMETERS;
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#define BEEP_FREQUENCY_MINIMUM 0x25
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#define BEEP_FREQUENCY_MAXIMUM 0x7FFF
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#ifdef __cplusplus
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}
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#endif
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#endif // _NTDDBEEP_
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