Reading binary data

[Ty Young]

I've stumbled across a function that returns a pointer to memory which 
contains data(AKA binary data) and a size for it. I'm assuming(correct 
me if I'm wrong here) that accessing this data requires use of lower 
level foreign memory API however the API seems to have changed since the 
presentation given a few months back. What is the correct way currently 
for accessing this data?