Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

This method is called repeatedly by the framework to process the next chunk of input. The implementation should parse a suitable (preferably not too large) chunk of the input, and return a boolean value that indicates whether there is more work to be done before this file is completely parsed.

The parser fires this event at regular intervals in order to report the progress so that interested parties can ascertain whether the parsing process is indeed in progress and has not hung. That way users get an idea about how fast the parsing job is progressing. Framework consumers should typically not connect directly to this event, but rather connect to the corresponding event on the IFileConverter instance.