DevHelp Beep: Difference between revisions
Created page with "This service generates a beep. ==Syntax== ===C=== <PRE> USHORT APIENTRY DevHelp_Beep(USHORT Frequency, USHORT DurationMS); </PRE> ===Assembler=..." |
|||
| (3 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
{{DISPLAYTITLE:DevHelp_Beep}} | |||
This service generates a beep. | This service generates a beep. | ||
| Line 4: | Line 5: | ||
===C=== | ===C=== | ||
<PRE> | <PRE> | ||
USHORT APIENTRY DevHelp_Beep(USHORT Frequency, | USHORT APIENTRY DevHelp_Beep(USHORT Frequency, USHORT DurationMS); | ||
</PRE> | </PRE> | ||
| Line 18: | Line 18: | ||
==Parameters== | ==Parameters== | ||
===C=== | ===C=== | ||
; Frequency (USHORT) : Frequency of beep in Hz | ; ''Frequency'' ([[USHORT]]) - input: Frequency of beep in Hz | ||
; DurationMS (USHORT) : Duration of beep in milliseconds | ; ''DurationMS'' (USHORT) - input: Duration of beep in milliseconds | ||
===Assembler=== | ===Assembler=== | ||
<PRE> | <PRE> | ||
| Line 33: | Line 33: | ||
Success Indicator: 0 | Success Indicator: 0 | ||
Possible errors: | ;Possible errors: ERROR_INVALID_FREQUENCY (395) | ||
===Assembler=== | ===Assembler=== | ||
Latest revision as of 18:12, 23 May 2025
This service generates a beep.
Syntax
C
USHORT APIENTRY DevHelp_Beep(USHORT Frequency, USHORT DurationMS);
Assembler
MOV BX,_Freq ; Frequency of beep in Hz MOV CX,_Duration ; Duration of beep in milliseconds MOV DL,DevHlp_Beep CALL [Device_Help]
Parameters
C
- Frequency (USHORT) - input
- Frequency of beep in Hz
- DurationMS (USHORT) - input
- Duration of beep in milliseconds
Assembler
MOV BX,_Freq ; Frequency of beep in Hz MOV CX,_Duration ; Duration of beep in milliseconds MOV DL,DevHlp_Beep CALL [Device_Help]
Return Code
C
Success Indicator: 0
- Possible errors
- ERROR_INVALID_FREQUENCY (395)
Assembler
'C' Clear if successful.
AX = 0.
'C' Set if error.
AX = Error code.
Possible errors:
ERROR_INVALID_FREQUENCY (395)
Remarks
This function uses the DX register.
Example Code
C
#include "dhcalls.h"
USHORT APIENTRY DevHelp_Beep(USHORT Frequency,
USHORT DurationMS);