Simulator variables handling

[JP744]

Hello,

I am writing a C++ WIN32 add-on which reads every 5 seconds the following data from P3D :

- Aircraft altitude
- Ambient wind direction
- Ambient wind velocity
- Ambient OAT

My add-on connects and receive data every 5 seconds, but I have a problem when I try to read the variables when I stored the values. Here is my code :

void simConnectEventThread(void *pArg)
{
    hSimConnectEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

    if(SUCCEEDED(SimConnect_Open(&hSimConnect, "PSXAloft", NULL, 0, hSimConnectEvent, 0)))
    {
        pSimConnectStatusText->print("Connected", 1, TRUE);           
       
        SimConnect_AddToDataDefinition(hSimConnect, DEFINTION_OAW, "PLANE ALTITUDE", "Feet");
        SimConnect_AddToDataDefinition(hSimConnect, DEFINTION_OAW, "AMBIENT TEMPERATURE", "Celcius");
        SimConnect_AddToDataDefinition(hSimConnect, DEFINTION_OAW, "AMBIENT WIND VELOCITY", "Knots");
        SimConnect_AddToDataDefinition(hSimConnect, DEFINTION_OAW, "AMBIENT WIND DIRECTION", "Degrees");       

        SimConnect_RequestDataOnSimObject(hSimConnect, REQUEST_OAW, DEFINTION_OAW, SIMCONNECT_OBJECT_ID_USER, SIMCONNECT_PERIOD_SECOND, 0, 0, 5, 0);       

        while((!quit) && (WaitForSingleObject(hSimConnectEvent, INFINITE) == WAIT_OBJECT_0))
        {
            SimConnect_CallDispatch(hSimConnect, dispatchProc, NULL);
        }

        CloseHandle(hSimConnectEvent);
        SimConnect_Close(hSimConnect);
    }
    pSimConnectStatusText->print("Disconnected from simconnect", 2, TRUE);
    quit = FALSE;
}

void CALLBACK dispatchProc(SIMCONNECT_RECV *pData, DWORD cbData, void *pContext)
{
    switch(pData->dwID)
    {
        case SIMCONNECT_RECV_ID_OPEN:
        {
            pDebug->print("SIMCONNECT CHANEL OPEN\n", "", "");
            break;
        }

        case SIMCONNECT_RECV_ID_SIMOBJECT_DATA:
        {
            SIMCONNECT_RECV_SIMOBJECT_DATA *pObjData = (SIMCONNECT_RECV_SIMOBJECT_DATA*)pData;        

            switch(pObjData->dwRequestID)
            {
                case REQUEST_OAW:
                {               
                    pIncDataSim = (DataIncSim*)&pObjData->dwData;                    

                    stringstream ss;
                    string sstring;
                    ss.str(string());
                    ss.clear();                   
                    ss << "OAT : " << pIncDataSim->oat << "\n";
                    sstring = ss.str();
                    pDebug->print(sstring, "\n", "");
                    ss.str(string());
                    ss.clear();
                    ss << "Altitude : " << pIncDataSim->altitude << "\n";
                    sstring = ss.str();
                    pDebug->print(sstring, "\n", "");
                    ss.str(string());
                    ss.clear();
                    ss << "Wind dir : " << pIncDataSim->windDir << "\n";
                    sstring = ss.str();
                    pDebug->print(sstring, "\n", "");
                    ss.str(string());
                    ss.clear();
                    ss << "Wind vel : " << pIncDataSim->windVel << "\n";
                    sstring = ss.str();
                    pDebug->print(sstring, "\n", "");               
                   
                    break;
                }               
            }
            break;
        }

        case SIMCONNECT_RECV_ID_QUIT:
        {
            quit = TRUE;
            break;
        }
    }
}

Here is the class where I store informations :

#ifndef CLASS_DATA_INC_SIM_HEADER
#define CLASS_DATA_INC_SIM_HEADER

using namespace std;

class DataIncSim
{
    public:

    double altitude; // Aircraft current altitude
    double oat; // Current ambient OAT   
    double windVel; // Current ambient wind velocity
    double windDir; // Current ambient wind direction
   

    private:

};
#endif

And finally here is what I get within my application debug window :

SIMCONNECT CHANEL OPEN

OAT : 0.997356

Altitude : 37709.8

Wind dir : -2.53017e-098

Wind vel : 0

What am I doing wrong with data ? I tried many tips but nothing is working. Thank you in advance for your help.

Regards,
Jean-philippe