IFilterGraph2::ReconnectEx method (strmif.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The ReconnectEx method breaks the existing pin connection and reconnects it to the same pin, using a specified media type.

Applications should not call this method. It is called by filters during the graph building process.


HRESULT ReconnectEx(
  [in] IPin                *ppin,
  [in] const AM_MEDIA_TYPE *pmt


[in] ppin

Pointer to the pin to disconnect and reconnect.

[in] pmt

Pointer to the media type to reconnect with. Specify NULL to use the existing media type.

Return value

Returns an HRESULT value. Possible values include the following.

Return code Description
Pin was not connected. No error.
NULL pointer argument.
The filter is not stopped, but it does not support reconnection while in a running state.


Filters can call this method in order to renegotiate a pin connection. The method executes on a separate thread. Before calling this method, call IPin::QueryAccept on the other pin to ensure that the reconnection attempt will succeed. Do not call this method unless QueryAccept returns S_OK. Otherwise, because the reconnection is performed asynchronously, the reconnection might fail even though the ReconnectEx method succeeds, leaving the filter graph in an inconsistent state.

This method improves on the IFilterGraph::Reconnect method by specifying a media type. This makes the reconnection more likely to succeed.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IFilterGraph2 Interface

Reconnecting Pins