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Sets up a recurring advise with the reference clock.
Syntax
HRESULT AdvisePeriodic( REFERENCE_TIME StartTime, REFERENCE_TIME PeriodTime, HSEMAPHORE hSemaphore, DWORD* pdwAdviseToken ); |
Parameters
- StartTime
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Start at this time.
- PeriodTime
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Time between notifications.
- hSemaphore
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Advise through a semaphore.
- pdwAdviseToken
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Advise token that identifies the link with the clock.
Return Value
Returns one of the following HRESULTvalues.
| Value | Description |
|---|---|
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E_OUTOFMEMORY |
Out of memory. |
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E_INVALIDARG |
Invalid argument. |
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NOERROR |
No error. |
Remarks
A semaphore, rather than an event, is used to ensure that multiple notifications can be seen by the user.
Each time an amount of time specified in the PeriodTimeparameter elapses, the semaphore is released.
When no further notifications are required, call CBaseReferenceClock::Unadviseand pass the pdwAdviseTokenvalue returned from this call.
For example, the following code extract sets up an advise link that fires its first advise five seconds from now and then signals every second until Unadviseis called. By using a semaphore with a count of 10, the clock is effectively able to cache 10 events.
 Copy Code
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HANDLE hSemaphore = CreateSemaphore(NULL, 0, 10, NULL); // Assume pRefClock is an IReferenceClock* variable. REFERENCE_TIME rtPeriodTime = 1000 * (UNITS / MILLISECONDS); // A one-second interval REFERENCE_TIME rtNow; DWORD dwAdviseToken; pRefClock->GetTime(&rtNow); pRefClock->AdvisePeriodic(rtNow+(5*rtPeriodTime), PeriodTime, hSemaphore, &dwAdviseToken); |
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Requirements
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment,Version 2.12 requires DXPAK 1.0 or later |