Writing a CoD 4 Aimbot - Mac

I have the cracked version of CoD 4, and I want to write an aimbot for it.

How do I write an aimbot? And I'm on a Mac!

I've searched the forums, and it said that you should start with Visual Basic and also use C++ to write a hack. If you're using C++, you should use Bloodshed C++ or Eclipse to write it. I can't get Visual Basic (only for Windows!) and can't get Bloodshed C++ (only for Windows!). So, I am resorting to using Eclipse. So, how do I write a hack for Mac?

Actually, my first hack doesn't have to be an aimbot. That might be much too hard. I just want to write something really simple that doesn't drastically change gameplay, but just so I learn how to write a hack.

I already know Java and a bit of C. Please help. Ask questions if I confused you.

Well I'm assuming coding for Mac is completely different to coding for Windows (since there's the Windows API to make life easier). So I have no idea.