Getting Data from Flight Sim

[jsdratm]

I am able to write data to Flight Sim now, but I am having trouble getting the data from it. If I want to get altitude, for example, is there a function I can call that returns the value immediately?

The way I have my DLL set up, I want to have variables for each parameter and a get function for each parameter. To update the variables, I want to call a single function. Is it possible? Does anyone have source code covering this besides the request data sample?

//////////////
//Pseudocode//
//////////////

// App calling DLL
SimConnectApp_GetUpdatedDataFromFlightSim();
double newAltitude = SimConnectApp_GetAltitude();

--------------------

// DLL
double Altitude;

SimConnectApp_GetUpdatedDataFromFlightSim(){
Altitude = getAltitudeFromFlightSim();
}

SimConnectApp_GetAltitude(){
return Altitude;
}

 

[ronh]

Hi,

Don't have any code, but look at the "tagged data" example.

You could add a global static "atl" variable to your DLL.
Have your DLL request the altitude every 1 sec or 4 sec and store it in alt.
Then have your app call the DLL and look up the "alt" global value and do what ever.

You have to weight the performance of requesting altitude every 1 second/4 seconds to just having your app request data from the DLL and wait in a loop till the DLL returns with the event request.

 

[Pete Dowson]

I am able to write data to Flight Sim now, but I am having trouble getting the data from it. If I want to get altitude, for example, is there a function I can call that returns the value immediately?

Not with SimConnect -- that is called "polling" and is the way the FSUIPC interface works.

SimConnect uses a server/client model, where you notify it of the data you want and how often you want it (e.g. only when it changes, the most useful method), and it notifies you one or more times later, when it provides you those data updates. It does this via "call back" procedure, in the same way as Windows messages tell you when the user interacts with your program. In fact one way of using SimConnect is to get it to send you a message when it has something for you.

Regards

Pete

 

[jsdratm]

I was able to use the tabbed data sample as an example and it works great. It is very fast, even though it isn't directly accessing the variables, and works just fine.