How to use the Infohash to get the torrent file ?

[holicc]

I'm working the Bt a few weeks , but i have been stumped how to use the infohash to get connection with peer and download torrent file T_T . when i send a query to ask for more piece , the peer is not response for that , but other request is response correct such as handshake .

Could you show me how to do this?

Thank you .