C++ ODB USB Interface

i want to to connect a OBD-USB (http://ift.tt/1EUU0gd) Device to my Laptop and stream the received data to c++ program. Problem is i have no idea how i can communicate with Tool via USB, if there is any library or protocol-standard that describes the way the datas are sent from such OBD-Usb-Tools.

Does anyone have some experience or can name some tools/sites that can help me?

Thanks in advance

Edit: Wow getting many downvotes but not even a comment what's wrong ...