ntddbeep.h

来自「MinGW+MSYS开发必用的api参考」· C头文件 代码 · 共 55 行

/*
 * ntddbeep.h
 *
 * Beep device IOCTL interface
 *
 * This file is part of the w32api package.
 *
 * Contributors:
 *   Created by Casper S. Hornstrup <[e-mail]>
 *
 * THIS SOFTWARE IS NOT COPYRIGHTED
 *
 * This source code is offered for use in the public domain. You may
 * use, modify or distribute it freely.
 *
 * This code is distributed in the hope that it will be useful but
 * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
 * DISCLAIMED. This includes but is not limited to warranties of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

#ifndef __NTDDBEEP_H
#define __NTDDBEEP_H

#if __GNUC__ >=3
#pragma GCC system_header
#endif

#ifdef __cplusplus
extern "C" {
#endif

#include "ntddk.h"

#define DD_BEEP_DEVICE_NAME               "\\Device\\Beep"
#define DD_BEEP_DEVICE_NAME_U             L"\\Device\\Beep"

#define IOCTL_BEEP_SET \
  CTL_CODE(FILE_DEVICE_BEEP, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)

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

#ifdef __cplusplus
}
#endif

#endif /* __NTDDBEEP_H */