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IFilterGraph::AddFilter method

Applies to: desktop apps only

The AddFilter method adds a filter to the graph.

Syntax

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HRESULT AddFilter(
  [in]  IBaseFilter *pFilter,
  [in]  LPCWSTR pName
);

Parameters

pFilter [in]: Pointer to the IBaseFilter interface of the filter to add.
pName [in]: Pointer to a wide-character string containing a name for filter.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
S_OK	Success.
VFW_S_DUPLICATE_NAME	Successfully added a filter with a duplicate name.
E_FAIL	Failure.
E_OUTOFMEMORY	Insufficient memory.
E_POINTER	NULL pointer argument.
VFW_E_CERTIFICATION_FAILURE	Use of this filter is restricted by a software key.
VFW_E_DUPLICATE_NAME	Failed to add a filter with a duplicate name.

Remarks

The name of the filter can be NULL, in which case the Filter Graph Manager generates a name. If the name is not NULL and is not unique, this method will modify the name in an attempt to generate a new unique name. If this is successful, this method returns VFW_S_DUPLICATE_NAME. If it cannot generate a unique name, it returns VFW_E_DUPLICATE_NAME.

AddFilter calls the filter's IBaseFilter::JoinFilterGraph method to inform the filter that it has been added. AddFilter must be called before attempting to use the IGraphBuilder::Connect, IFilterGraph::ConnectDirect, or IGraphBuilder::Render method to connect or render pins belonging to the added filter.

The Filter Graph Manager holds a reference count on the filter until the filter is removed from the graph or the Filter Graph Manager is released.

Requirements