|Microsoft DirectX 9.0|
This topic applies to Windows XP only.
The Step method steps through the video stream by a specified number of frames.
HRESULT Step( long lStep );
[in] Specifies how many frames to step. If lStep is 1, the Video Control steps forward one frame. If lStep is a number N greater than 1, the Video Control skips N - 1 frames and shows the Nth frame.
The method returns an HRESULT. Possible values include the following.
|ERROR_INVALID_STATE||The graph is not built. Call the Build or View method on the Video Control.|
|S_OK||The method succeeded.|
Note The value ERROR_INVALID_STATE is converted to an HRESULT with the HRESULT_FROM_WIN32 macro.
Although a negative value for lStep is defined as stepping backwards, that functionality is currently not implemented, and the method returns E_NOTIMPL.
Call the IMSVidCtl::Build or IMSVidCtl::View method before calling this method.