A free C++ BitTorrent/HTTP/FTP Download Client

bencode:

string:      <string length>:<string data> 
integer：    i<integer>e 
list:        l<bencoded type>e
dictionary:  d<bencoded string><bencoded element>e 

example:

string:      5:hello
integer：    i680e 
list:        l5:hello5:worlde
dictionary:  d4:name8:BitComet3:ver4:1.11e