crypto++ help

I recently downloaded the crypto++ class library and am having a bit of trouble getting things to happen. I have read the text on the source-filter-sink concept and was able to create a DES file encryptor. What I would like to do is use either blowfish or IDEA to encrypt a variable length data stream. Does anybody have experience with this library? A short code snippet or similar help would be appreciated. Bill Woelbeling wwoelbel@midwest.net