Treylis

I was describing Objectivism to a friend of mine--who has a philosophy degree--and he said that it seems to be pretty much Wittgenstein's Tractatus Logico-Philosophicus (what a clunky title, heh), which he apparently repudiated later. Unfortunately, I'm a philosophy dilettante--engineer, actually--and I'm pretty much totally in the dark insofar as this man and his philsophy. I tried looking online for a comparison between TLP and Objectivism, but I didn't find anything really informative. The aforementioned philosopher friend has no knowledge of Rand, either, and he doesn't have the time to read the books, so, well... Can somebody explain to me the differences here?