CBaseReferenceClock::AdvisePeriodic (Windows CE 5.0)
Sets up a recurring advise with the reference clock.
HRESULT AdvisePeriodic(REFERENCE_TIMEStartTime,REFERENCE_TIMEPeriodTime,HSEMAPHOREhSemaphore,DWORD* pdwAdviseToken);
Parameters
- StartTime
Start at this time. - PeriodTime
Time between notifications. - hSemaphore
Advise through a semaphore. - pdwAdviseToken
Advise token that identifies the link with the clock.
Return Values
Returns one of the following HRESULT values.
| Value | Description |
|---|---|
| E_OUTOFMEMORY | Out of memory. |
| E_INVALIDARG | Invalid argument. |
| 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 PeriodTime parameter elapses, the semaphore is released.
When no further notifications are required, call CBaseReferenceClock::Unadvise and pass the pdwAdviseToken value 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 Unadvise is called. By using a semaphore with a count of 10, the clock is effectively able to cache 10 events.
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);
Requirements
DirectShow applications and DirectShow filters have different include file and link library requirements.
For more information, see Setting Up the Build Environment.
OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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