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CBaseFilter::JoinFilterGraph

  • Articolo
 
Microsoft DirectShow 9.0

CBaseFilter::JoinFilterGraph

The JoinFilterGraph method notifies the filter that it has joined or left a filter graph. This method implements the IBaseFilter::JoinFilterGraph method.

Syntax

  HRESULT JoinFilterGraph(
    IFilterGraph *pGraph,
    LPCWSTR pName
);

Parameters

pGraph

Pointer to the filter graph manager's IFilterGraph interface, or NULL if the filter is leaving the graph.

pName

[in, string] Pointer to a Unicode string containing a name for the filter.

Return Value

Returns S_OK.

Remarks

This method sets the CBaseFilter::m_pGraph member variable equal to the pGraph parameter. It also queries for an IMediaEventSink interface pointer and stores it in the CBaseFilter::m_pSink member variable. However, the filter does not keep a reference count on either of these interfaces. Doing so would create a circular reference count, because the filter graph manager keeps a reference count on the filter.

The method copies the string specified by pName into the CBaseFilter::m_pName member variable.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also