IReferenceClock::AdvisePeriodic method (strmif.h)

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The AdvisePeriodic method creates a periodic advise request.

Syntax

HRESULT AdvisePeriodic(
  [in]  REFERENCE_TIME startTime,
  [in]  REFERENCE_TIME periodTime,
  [in]  HSEMAPHORE     hSemaphore,
  [out] DWORD_PTR      *pdwAdviseCookie
);

Parameters

[in] startTime

Time of the first notification, in 100-nanosecond units. Must be greater than zero and less than MAX_TIME.

[in] periodTime

Time between notifications, in 100-nanosecond units. Must be greater than zero.

[in] hSemaphore

Handle to a semaphore, created by the caller.

[out] pdwAdviseCookie

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 IReferenceClock::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

Error and Success Codes

IReferenceClock Interface