"Kza" <kzawah@g...> writes:

> Feature 1: A progress display. I have tried a few times now to find a
> way of asking xerces how far through a file it is in bytes, but no
> luck. (I did try a per element check, but that involves a whole extra
> parse at the start just to count the elements). I have tried using the
> LocalFileInputSource, and getting its BinInputStream and calling itc
> curPos, but its always 0.
>
> Any ideas?

You can implement your own InputStream which will keep track of how
much data Xerces-C++ has consumed so far. Combine this with the total
length of the file and you can calculate the progress.


> Feature 2: Loading only a "screenful" of the file at a time. I also
> would like some sort of random access functionality, so if the user
> scrolls down to 75% of the file, the parser skips forward to that
> position and starts reading there, and when they scroll back up it goes
> up and reads just that little bit of the file.

This one would definitely be easier with an in-memory model (e.g., DOM).


hth,
-boris


-- 
Boris Kolpackov
Code Synthesis Tools CC
http://www.codesynthesis.com
Open-Source, Cross-Platform C++ XML Data Binding