Microsoft DirectX 9.0


The Initialize method initializes the multimedia stream object.


HRESULT Initialize(
  STREAM_TYPE StreamType,
  DWORD dwFlags,
  IGraphBuilder *pFilterGraph



[in] Member of the STREAM_TYPE enumeration, specifying whether the streams are read-only, write-only, or read/write.


[in] Must be one of the following values:

Value Description
Zero Create a filter graph that runs on a separate thread.
AMMSF_NOGRAPHTHREAD Create a filter graph that runs on the calling thread.


[in] [optional] Pointer to the IGraphBuilder interface, or NULL. If this parameter is non-NULL, it specifies a filter graph that the multimedia stream object will use. Otherwise, the multimedia stream object creates a new filter graph.

Return Values

Returns an HRESULT value. Possible values include the following.

Value Description
E_POINTER NULL pointer argument.
S_OK Success.


If you specify AMMSF_NOGRAPHTHREAD in the dwFlags parameter, the calling thread must process window messages, and it must release all multimedia streaming objects before the thread exits. Otherwise, the application might deadlock.

See Also