question

Hi,

I'm desperately trying to get airport information from MSFS using the relatively new SimConnect_AddToFacilityDefinition function.


Sending the request and receiving some kind of data is working fine. However, I'm not able to get more than a single int.

I've made a bare-minimum example for VS2022 in .NET 6 for you to test it yourself easily: https://github.com/Clamb94/SimconnectAirportDataTest


It's obviously very simple. It opens the SimConnect connection and checks every 500ms for a new message.

Once it get's the OSimConnect_OnRecvOpen message, it request the latitude and number of runways in Frankfurt.

```

OSimConnect.AddToFacilityDefinition(sd, "OPEN AIRPORT");

OSimConnect.AddToFacilityDefinition(sd, "LATITUDE");

OSimConnect.AddToFacilityDefinition(sd, "N_RUNWAYS");

OSimConnect.AddToFacilityDefinition(sd, "CLOSE AIRPORT");

OSimConnect.RequestFacilityData(sd, rd, "EDDF", "");

```

Shortly thereafter, I'll receive a response on OSimConnect_OnRecvFacilityData(SimConnect sender, SIMCONNECT_RECV_FACILITY_DATA data).

Now comes the problem: I can't make anything useful out of the data member.


When I'm only requesting a single INT32, like "N_RUNWAYS", the data.Data[0] variable holds a value of 4, which is correct for Frankfurt.


When I'm only requesting a single FLOAT64, like "LATITUDE", the data.Data[0] variable holds an UInt32 with value 1550843904, which doesn't make any sense to me.

I tried casting it to an double, but this throws an exception:


```
double lat = (double)data.Data[0];

throws:

{"Unable to cast object of type 'System.UInt32' to type 'System.Double'."} System.Exception {System.InvalidCastException}

```


Obviously, I'm also not able to request more than one value at a time and get a useful response.

I tried casting it to a struct like this, but this also throws a System.InvalidCastExcpetion.

(That's the version on GitHub)


```
[StructLayout(LayoutKind.Sequential, Pack = 1)
struct airport

{

public double latitude;

public int nRunways;

};


airport a = (airport)data.Data[0];

Console.WriteLine($"Lat: {a.latitude}; Rwys: {a.nRunways}");
```


There is an example C++ included in the SDK samples called FacilityDataDefinition, they also cast the reply in a struct.

But I can't seem to replicate the C++ code in C#.


Any ideas how to solve this?

Thanks


Best regards

Axel