IFileSinkFilter2 interface

The IFileSinkFilter2 interface extends the IFileSinkFilter interface. Filters that write media streams to a file implement this interface. A file sink filter in a video capture filter graph, for instance, saves the output of the video compression filter to a file. Typically, the application running this filter graph should allow the user to enter the name of the file to which to save the data. This interface enables you to communicate this information.

IFileSinkFilter2 adds the option to determine whether the file it writes should destroy an existing file of the same name. In the video capture case, do not destroy a file you've already created, because preallocating file space takes valuable time. By default, the new file does not destroy the old one. Otherwise, destroy the original file to make sure the file you author doesn't contain garbage.

When to implement

A filter should implement this interface when it needs the name of an output file or needs to set options for that file. Note that there is currently no base class implementation of this interface.

When to use

When an application must set the name of the file into which the file sink filter will write, it should use this interface to get and set the file name or change options.


The IFileSinkFilter2 interface inherits from IFileSinkFilter. IFileSinkFilter2 also has these types of members:


The IFileSinkFilter2 interface has these methods.


Retrieves whether the file writer destroys the file when it creates the new one.


Determines whether the file writer destroys the file when it creates the new one.



Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]


Strmif.h (include Dshow.h)



See also