IReferenceClock::AdvisePeriodic (Windows Embedded CE 6.0)

1/6/2010

This method creates a periodic advise request.

Syntax

HRESULT AdvisePeriodic(
  REFERENCE_TIME rtStartTime,
  REFERENCE_TIME rtPeriodTime,
  HSEMAPHORE hSemaphore,
  DWORD* pdwAdviseCookie
);

Parameters

• rtStartTime
  [in] Time of the first notification, in 100-nanosecond units.

  Must be greater than zero and less than MAX_TIME.

• rtPeriodTime
  [in] Time between notifications, in 100-nanosecond units.

  Must be greater than zero.

• hSemaphore
  [in] Handle to a semaphore, created by the caller.

• pdwAdviseCookie
  [out] Pointer to a variable that receives an identifier for the advise request.

Return Value

Returns an HRESULT value.

Possible values include the following.

Remarks

At each notification time, the clock releases the semaphore specified in the hSemaphore parameter. When no further notifications are required, call Unadvise and pass the pdwAdviseToken value returned from this call.

The following code example creates an advise request that signals five seconds from the time it is created, and again every second thereafter.

IReferenceClock *pRefClock = NULL;
// Get an IReferenceClock pointer (not shown).
DWORD          dwAdviseToken;
HANDLE         hSemaphore = CreateSemaphore(NULL, 0, 0x7FFFFFFF, NULL);
REFERENCE_TIME rtPeriodTime = 10000000; // A one-second interval
REFERENCE_TIME rtNow;
pRefClock->GetTime(&rtNow);
pRefClock->AdvisePeriodic(rtNow + (5 * rtPeriodTime),
                          rtPeriodTime, 
                          hSemaphore, 
                          &dwAdviseToken);
...
pRefClock->Unadvise(dwAdviseToken);

Requirements

See Also

Reference

IReferenceClock Interface