Get position data in an own little program

[Researcher]

Hello,
my question is very simple: How can I get the position data sent from PPT system in my own little C++ program?

The examples in the Vizard environment work fine. But I am not sure how I can access the position data without Vizard.
I tried to use code from the PPT Developer's API, but when I print the values on the console they jump wildly (between about -9 and 8)
Is there a way to access the data, received by the serial port in a C(++) program?

Maybe I just missed something, but I didn't find an example...