Hi Stephen, From: Stephen Webb [mailto:swebb75ky@gmail.com]

My trouble is knowing when the end-of-input has arrived. Is there a well defined way that my output filter is notified of a close event or something similar? I did see close functions defined in the example filters, but mine isn't getting called.

Is you filter's category convertible to "closable_tag"? A filter's category has to be tagged as "closable" for its close function to be called: http://www.boost.org/libs/iostreams/doc/index.html?path=4.1.3.1 HTH, Éric