problems getting variables

[pakine]

hi all, im beginning with sim connect, and i need to get some flight variables. I'vw started with one of SimConnect SDK samples, its called Request Data.
I think It is the closest i want to do.

#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;
    printf("callback llamado\n");
    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 to Flight Simulator!\n");   
        
        // 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");
		
		int i=0;
        while( 0 == quit )
        {
			if(i%500 == 0)
				printf("%i\n",i);
            SimConnect_CallDispatch(hSimConnect, MyDispatchProcRD, NULL);
            Sleep(1);
			i++;
        } 

        hr = SimConnect_Close(hSimConnect);
		printf("adios\n");
		
    }
}

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

    testDataRequest();

	return 0;
}

it's supossed after the program receives simstart event, the switch in the callback function receives SIMCONNECT_RECV_ID_SIMOBJECT_DATA_BYTYPE
that will print the values of these variables.

As far as i 've tried, the program enter in the while loop and receive the simstart event, but i've never seen anymore info printed

could anyone help me?

 

[Simon853]

Are you sure you receive the sim start event? Whenever I've messed with those SDK examples the first thing I do is replace the Sim start event with a simconnect open event trap, because you only get a start event when the sim starts, and yet to open simconnect it needs to be running, (or maybe in a main menu dialog so the event is sent when you enter flight), whereas the open event always works.

The other thing I'd do is implement an exception case in the callback. Often times I specify definitions wrong or something like that, and trapping exceptions helps to track them down.

Si

 

[pakine]

i've realized the i receive the simstart event when i start a new flight or when im controlling the plane and i press Esc (pause menu) and i resume the flight.

As i have read in the SimConnect reference i request some info with this instruction:
hr = SimConnect_RequestDataOnSimObjectType(hSimConnect, REQUEST_1, DEFINITION_1, 0, SIMCONNECT_SIMOBJECT_TYPE_USER);

afterthat i can get this structure, that contains the info that i want:
SIMCONNECT_RECV_ID_SIMOBJECT_DATA_BYTYPE


my problem is that i can't be receiving all the time the info requested, just when i pause the FSX and i resume it.

 

[chrisdub]

SimConnect_RequestDataOnSimObjectType will send the requested data once only, you will have to send the request again if you need more data

 

[pakine]

ok, thank you very much