Check out this post on MAKE:
http://blog.makezine.com/archive/2008/11/howto_hacking_rjdj_with_p.html?CMP=OTC-0D6B48984890

I know I'll be trying this out as soon as I'm done with other projects.

i'm working on an iphone app at the moment.

it's going to get finally coded in C, but we are prototyping it in PD.

..can be useful when using c++. pd addon for openframeworks on github:
http://github.com/damiannz/ofxPd