[Alan Anderson]

I think the simplest way to find out what axis and button numbers correspond to the controls on a joystick or gamepad is to hook it up and see what you get. In LabVIEW, it's as easy as creating an indicator on the Axes and Buttons outputs of the Joystick Get vi. In C++, you'll want code to continuously display all the axis and button values.

In my experience, the d-pad typically shows up on joystick axes 5 and 6.