Thread: Using RegisterWaitForSingleObject.

Hi,

I have a question regarding RegisterWaitForSingleObject :
Should i call UnregisterWait after using RegisterWaitForSingleObject? If yes, can provide me with an example; because i am having problems with the call to UnregisterWait. I am using it as follows( just an example ) :

Code:

bool      runing = false;
HANDLE hTimer ;
HANDLE	phObject;

LARGE_INTEGER liTime;
liTime.QuadPart = -100000000;

void CDR( void )
{
    SetThreadExecutionState( ES_DISPLAY_REQUIRED | ES_CONTINUOUS );
    runing = false;
}

void Function( void )
{
   runing = true;
   hTimer = CreateWaitableTimer( NULL, FALSE, "WaitableTimer" );

   RegisterWaitForSingleObject( &phObject, hTimer, ( WAITORTIMERCALLBACK )CDR, NULL, INFINITE, WT_EXECUTEDEFAULT );

   SetWaitableTimer( hTimer, &liTime, 0, NULL, NULL, TRUE );
}

Function();
while( runing )
{
    Sleep( 1000 );
}
UnregisterWait( phObject ); // Error 997 : ERROR_IO_PENDING

You should probably use the callback method available to timer objects, rather than using the registerwait callback on a timer object.

Or kill the timer first and then unregister after the next callback. Not sure if that will work though.