Microsoft DirectX 9.0


The ConnectFrontEnd method builds the front end of the filter graph from the current timeline.


HRESULT ConnectFrontEnd( void ); 

Return Value

Returns an HRESULT value. Possible return values include the following:

Value Description
S_OK Success.
S_WARN_OUTPUTRESET Rendering portion of the graph was deleted.
E_INVALIDARG No timeline set for this render engine.
E_MUST_INIT_RENDERER Render engine failed to initialize.
E_RENDER_ENGINE_IS_BROKEN Operation failed because the project was not rendered successfully.
E_UNEXPECTED Unexpected error.
VFW_E_INVALIDMEDIATYPE Invalid media type.


This method does not build the rendering portion of the filter graph. The application must connect the output pins on the front end to the desired rendering filters:

If you are using the basic render engine, the output pins on the front end produce uncompressed data. If you are using the smart render engine, the output pins produce compressed data.

If you change the timeline after you build the filter graph, you must call ConnectFrontEnd again to rebuild the front end. The method preserves the rendering portion of the graph whenever possible. However, if you add or delete a group, or change the order of the groups, ConnectFrontEnd deletes the rendering portion and your application must rebuild it. If the method deletes the rendering portion, it returns S_WARN_OUTPUTRESET.


Header: Include Qedit.h. This header file is not compatible with Microsoft® Direct3D® headers later than version 7.

Library: Use strmiids.lib.

See Also