en:docs:fapi:dosbeep

DosBeep

This call generates sound from the speaker.

Syntax

DosBeep (Frequency, Duration)

Parameters
  • Frequency (USHORT) - input : Tone in Hertz (cycles per second) in the range 37 through 32767.
  • Duration (USHORT) - input : Length of the sound in milliseconds.
Return Code

rc (USHORT) - return Return code descriptions are:

  • 0 NO_ERROR
  • 395 ERROR_INVALID_FREQUENCY
Remarks

DosBeep executes synchronously. An application program that invokes DosBeep waits until the specified number of milliseconds expire before it resumes execution.

Example Code

C Binding

#define INCL_DOSPROCESS

USHORT  rc = DosBeep(Frequency, Duration);

USHORT  Frequency;     /* Hertz (Hz) */
USHORT  Duration;      /* Length of sound */

USHORT  rc;            /* return code */

This example generates a beep for 1 second (1,000 milliseconds) at a frequency of 1,380.

#define INCL_DOSPROCESS
#define BEEP_FREQUENCY 1380
#define BEEP_DURATION 1000

USHORT  rc;

rc = DosBeep(BEEP_FREQUENCY,
            BEEP_DURATION);

MASM Binding

EXTRN  DosBeep:FAR
INCL_DOSPROCESS     EQU 1

PUSH   WORD    Frequency     ;Frequency (in Hertz)
PUSH   WORD    Duration      ;Length of sound (in milliseconds)
CALL   DosBeep

Returns WORD

Note


en/docs/fapi/dosbeep.txt · Last modified: 2018/08/25 15:00 by prokushev