Thanks Scruffyduck,
I have dowloaded Pete's FSUIPC.dll file and also the FSUIPC programmers SDK which includes FS Interrogate, and I have managed to extract variables using this program.
I am now trying to see how the UIPCHello program works, the exe files seems to work fine but the .cpp file does not compile, therefore I can't make any ammendments to it in order to get different variables out.
Bearing in mind I have no C++ programming skills whatsover so am kind of relying on modifying the UIPCHello program rather than writing my own.
I'm also hoping to pick up enough C++ skills on the way to have a basic understanding of what is going on.
What I am trying to do is read in the variables, convert them to ARINC 429 words and re-transmit them to some avionics equipment (Displays, and Flight management computer), the variables I am trying to extract are position, attitude and air data variables (Pitch, Roll, heading, etc...)
If you have any experience in this field, or have any more advice to offer, I would be more than grateful.