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Sample: RequestData.cpp

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//------------------------------------------------------------------------------
//
//  SimConnect Data Request Sample
// 
//    Description:
//                After a flight has loaded, request the lat/lon/alt of the user
//                aircraft
//------------------------------------------------------------------------------

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>

#include "SimConnect.h"

int     quit = 0;
HANDLE  hSimConnect = NULL;

struct Struct1
{
    char    title[256];
    double  kohlsmann;
    double  altitude;
    double  latitude;
    double  longitude;
};

static enum EVENT_ID{
    EVENT_SIM_START,
};

static enum DATA_DEFINE_ID {
    DEFINITION_1,
};

static enum DATA_REQUEST_ID {
    REQUEST_1,
};

void CALLBACK MyDispatchProcRD(SIMCONNECT_RECV* pData, DWORD cbData, void *pContext)
{
    HRESULT hr;
    
    switch(pData->dwID)
    {
        case SIMCONNECT_RECV_ID_EVENT:
        {
            SIMCONNECT_RECV_EVENT *evt = (SIMCONNECT_RECV_EVENT*)pData;

            switch(evt->uEventID)
            {
                case EVENT_SIM_START:
                    
                    // Now the sim is running, request information on the user aircraft
                    hr = SimConnect_RequestDataOnSimObjectType(hSimConnect, REQUEST_1, DEFINITION_1, 0, SIMCONNECT_SIMOBJECT_TYPE_USER);
                    
                    break;

                default:
                   break;
            }
            break;
        }

        case SIMCONNECT_RECV_ID_SIMOBJECT_DATA_BYTYPE:
        {
            SIMCONNECT_RECV_SIMOBJECT_DATA_BYTYPE *pObjData = (SIMCONNECT_RECV_SIMOBJECT_DATA_BYTYPE*)pData;
            
            switch(pObjData->dwRequestID)
            {
                case REQUEST_1:
                {
                    DWORD ObjectID = pObjData->dwObjectID;
                    Struct1 *pS = (Struct1*)&pObjData;->dwData;
                    if (SUCCEEDED(StringCbLengthA(&pS;->title[0], sizeof(pS->title), NULL))) // security check
                    {
                        printf("\nObjectID=%d  Title=\"%s\"\nLat=%f  Lon=%f  Alt=%f  Kohlsman=%.2f", ObjectID, pS->title, pS->latitude, pS->longitude, pS->altitude, pS->kohlsmann );
                    } 
                    break;
                }

                default:
                   break;
            }
            break;
        }


        case SIMCONNECT_RECV_ID_QUIT:
        {
            quit = 1;
            break;
        }

        default:
            printf("\nReceived:%d",pData->dwID);
            break;
    }
}

void testDataRequest()
{
    HRESULT hr;

    if (SUCCEEDED(SimConnect_Open(&hSimConnect;, "Request Data", NULL, 0, 0, 0)))
    {
        printf("\nConnected...!");   
        
        // Set up the data definition, but do not yet do anything with it
        hr = SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_1, "Title", NULL, SIMCONNECT_DATATYPE_STRING256);
        hr = SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_1, "Kohlsman setting hg", "inHg");
        hr = SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_1, "Plane Altitude", "feet");
        hr = SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_1, "Plane Latitude", "degrees");
        hr = SimConnect_AddToDataDefinition(hSimConnect, DEFINITION_1, "Plane Longitude", "degrees");

        // Request an event when the simulation starts
        hr = SimConnect_SubscribeToSystemEvent(hSimConnect, EVENT_SIM_START, "SimStart");

        while( 0 == quit )
        {
            SimConnect_CallDispatch(hSimConnect, MyDispatchProcRD, NULL);
            Sleep(1);
        } 

        hr = SimConnect_Close(hSimConnect);
    }
}

int __cdecl _tmain(int argc, _TCHAR* argv[])
{

    testDataRequest();

    return 0;
}