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.


  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.

Return Values

The method returns an HRESULT. Possible values include the following.

Value Description
E_NOTIMPL Not implemented.
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.

See Also