> With the potential of exposing my C++ knowledge deficiency, I'll explain how
> far I got ;-)
> As mentioned in the last post, I have two variables I can access through the
> existing code I have.
> One variable is cur_fdm_state which is of type FGInterface. FGInterface is a
> parent class of JSBSim so accessing accessing the said 'get_fdmex()' method
> isn't easily done. I tried declaring a virtual method in FGInterface and
> defining it in JSBSim, but this only got ugly. The other variable is
> 'globals', but I haven't had much luck here either.
> With your knowledge of flightgear, do you know if it is possible to access
> methods from the JSBSim object via either of these variables? If so, could
> you provide suggestions?
In FGJSBSim (the JSBSim object derived from FGInterface) there is a private
member called
Aerodynamics that points to the FGAerodynamics object of JSBSim. If you have
your own
"cur_fdm_state" object, however, the Aerodynamics object won't be accessible
unless you
change the Aerodynamics object to be protected instead of private, or unless
you provide a
getter such as GetAerodynamics() that returns the pointer to the Aerodynamics
object.
Then, you could simply do:
my_string = cur_fdm_object->Aerodynamics->GetCoefficientStrings(delimiter);
-or-
my_string = cur_fdm_object->GetAerodynamics()->GetCoefficientStrings(delimiter);
> With the other option of using the XML file, could you give me an example of
> how the values would be retrieved?
<output name="localhost" type="SOCKET" port="1139" rate="10">
<coefficients> ON </coefficients>
</output>
If you were to do the above (i.e. place it in your aircraft config file) you
would have to
have a listening socket somewhere ready to receive the data. In another shell
window you
could type:
nc -l -p 1139
to listen to the data output by the sim. I've only done this with JSBSim
standalone - not
with FlightGear.
Jon
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