c++ code into unity

Ok so I have this game I have been working on and it is in visual studio 2008 c++ window32 consol app. and I was woundering how I can get this code to work with Unity? Is there a plugin or can i convert it some how?
I see the c# script thing when I was playing with unity, but I dont know C# and to tell the truth dont really know c++ all that much either, but hey the code run and its pretty fast too boot. But besides that.

you would have to write a dll that uses this code so you can use it with unity pro (only pro) in a standalone windows application