Hi,
It would likely be easier if you read through the DEMO_DLL in the ANT Library Package instead, as the Simulator interfaces through managed libraries before reaching the C based ANT library.
Reading the profiles directly on how to decode SPD, CAD, SPD&CAD;, and HRM and implementing them in Delphi rather then porting the simulator directly would also likely be easier, I would only use the simulator as a rough guide on how to decode the data packets.
Cheers