DevHelp Beep: Difference between revisions
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USHORT APIENTRY DevHelp_Beep(USHORT Frequency, | USHORT APIENTRY DevHelp_Beep(USHORT Frequency, USHORT DurationMS); | ||
</PRE> | </PRE> | ||
Revision as of 02:16, 25 November 2023
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)
- Frequency of beep in Hz
- DurationMS (USHORT)
- 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);