|Microsoft DirectX 9.0|
The GetDDrawSurface method retrieves the DirectDraw surface being used by the Overlay Mixer.
HRESULT GetDDrawSurface( LPDIRECTDRAWSURFACE *pDDrawSurface, BOOL *pdUsingExternal );
[out] Address of a pointer to the IDirectDrawSurface interface that is being used by the Overlay Mixer.
[out] Pointer to a variable that receives a Boolean value. It receives the value TRUE if the Overlay Mixer is using a DirectDraw surface specified by IDDrawExclModeVideo::SetDDrawSurface, or FALSE otherwise.
Returns an HRESULT value. Possible values include the following.
|E_INVALIDARG||Argument is invalid.|
|A DirectDraw error code||A DirectDraw error is encountered when trying to set the specified surface on the Overlay Mixer.|
If the filter graph has not set a DirectDraw surface and the Overlay Mixer has not yet allocated one, then pDDrawSurface will be set to NULL and pdUsingExternal will be set to FALSE.