DevHelp ResetTimer

This service removes a timer handler for the physical device driver.

Syntax

C

USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler );

Assembler

MOV   AX,Offset cs:timer_handler     ; Offset to timer handler
MOV   DL,DevHlp_ResetTimer

CALL  [Device_Help]

Parameters

C

TimerHandler (NPFN)

Offset to timer handler

Assembler

MOV   AX,Offset cs:timer_handler     ; Offset to timer handler

Return Code

Success Indicator: Clear if successful.

Possible errors: Invalid handler if carry flag is set.

Assembler

'C' Clear if successful.

   'C' Set if error.
       AX = Error code.
            Possible errors:
               Invalid handler if carry flag is set.

Remarks

ResetTimer removes a timer handler from the list of timer handlers. Timer handlers are analogous to the user timer interrupt (INT 1Ch). Refer to TickCount for a discussion of timer handlers.

DS should be set to the data segment of the physical device driver. If the physical device driver issued a call to PhysToVirt referencing the DS register, the physical device driver will restore DS to the original value.

Example Code

C

#include  "dhcalls.h"

USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler );