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MFAddPeriodicCallback function

Sets a callback function to be called at a fixed interval.

Syntax


HRESULT MFAddPeriodicCallback(
  _In_   MFPERIODICCALLBACK Callback,
  _In_   IUnknown *pContext,
  _Out_  DWORD *pdwKey
);

Parameters

Callback [in]

Pointer to the callback function, of type MFPERIODICCALLBACK.

pContext [in]

Pointer to a caller-provided object that implements IUnknown, or NULL. This parameter is passed to the callback function.

pdwKey [out]

Receives a key that can be used to cancel the callback. To cancel the callback, call MFRemovePeriodicCallback and pass this key as the dwKey parameter.

Return value

The function returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return codeDescription
S_OK

The function succeeded.

 

Remarks

To get the timer interval for the periodic callback, call MFGetTimerPeriodicity.

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Mfapi.h

Library

Mfplat.lib

DLL

Mfplat.dll

See also

Media Foundation Functions
Work Queues

 

 

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