Updating single variable in a structure

[PittsburghLever]

Hi,

Forgive me if this has been asked before: What is the best (meaning most efficient such that it costs least amount of frames) way to update a single variable in a stuct of variables? I tried looking into tagged variables, but since I will be reading and potentially setting some of the variables in the struct often, I understand that tagged variables are not the way to go.

So, that leaves me with an option that is to keep track of the last updated struct and only setting the diffs of the struct members whereafter I can update the whole struct.

Any ideas?

Thanks,
Boaz Lev

 

[Manuel Ambulo]

If you want to set a *SINGLE* simulation variable, you can try doing this:



1) Define a DEFINITION_ID for update *ONLY* the plane's latitude:

SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_PLANE_LATITUDE, "Plane Latitude", "degrees");

NOTE: Notice that i'm definiting a FLOAT64 variable for the plane's latitude definition as FLOAT64 is the *DEFAULT* data type



2) Now, when you are ready to update *ONLY* the plane's latitude:

// Declare my variable
double plane_lat = 9.3847572; // DOUBLE = FLOAT64

// Update *ONLY* the latitude on USER's AIRCRAFT
SimConnect_SetDataOnSimObject(hSimConnect, DEFINITION_PLANE_LATITUDE, SIMCONNECT_OBJECT_ID_USER, 0, sizeof(double), &plane_lat);

NOTE: Notice that im using "double" because we defined the "DEFINITION_PLANE_LATITUDE" to be a FLOAT64 variable in other words a "DOUBLE", that's why im setting --> "sizeof(double), &plane_lat"


For update more *INDIVIDUAL* variables, you will need to define more DEFINITION_IDs, and so on...


Hope that helps,



Manuel

 

[PittsburghLever]

Hi Manuel,

I thought of that approach, but I am wondering if splitting out logically related variables into several definitions in the long run is the best approach for performance. Doesn't that mean that FS(X) will have to call me back more frequently -- one for each define -- as opposed to one time for the whole master define that holds all the variables I am interested in?

Thanks for responding

 

[Daniel]

You could create one master struct and use it to have FS send you updates and then create several smaller structs and use them to send modifications back to FS.

Daniel