10 #define DD_BEEP_DEVICE_NAME "\\Device\\Beep"
11 #define DD_BEEP_DEVICE_NAME_U L"\\Device\\Beep"
12 #define BEEP_FREQUENCY_MINIMUM 0x25
13 #define BEEP_FREQUENCY_MAXIMUM 0x7FFF
14 #define IOCTL_BEEP_SET CTL_CODE(FILE_DEVICE_BEEP, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)
16 typedef struct _BEEP_SET_PARAMETERS
20 } BEEP_SET_PARAMETERS
, *PBEEP_SET_PARAMETERS
;