I know this isn't exactly c++ but has anyone used blender 2.69 and if so have you used the collision sensor. i am trying to but i can't get the property to work i'm not sure how to make it only count if it touches my cone.
Well unless someone has already done it or you give us a direct link to the tutorial section you are using then there is nothing we can do to help you with this. Blender Noob to Pro 3D tut is a fairly large series of tutorials to sift through. It isn't like we are going to instantly know what you have to do just by saying what you are doing and so far sifting through the site, I've yet to find a tutorial on collision or anything so I'm not sure what you have to do.
The problem with that tutorial is that, the version of Blender I am using doesn't have half the options so I would be stuck googling for finding the updated material to find what has changed. I got to the Motion subchapter before hitting a snag due to the UI being completely different between my version (2.69) and the version it was originally written for (2.44).