Skip to content
View in the app

A better way to browse. Learn more.
The AVSIM Community

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

Reading heading and speed values

Diuc38
in MS FSX | FSX=SE | P3D Simconnect Forum

Featured Replies

Hello,

 

I'm trying to read theses variables :

 - AIRSPEED TRUE and PLANE HEADING DEGREES TRUE.

 

So , to do this I wrote this king of code :

struct Struct1
{
	double altitude;
	double altitudeAboveGround;
	double latitude;
	double longitude;
	double heading;
	double trueAirSpeed;
};

and

SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Altitude","feet");
SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Alt Above Ground","feet");
SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Latitude","degrees");
SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Longitude","degrees");
SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Heading Degrees Magnetic","radians");
SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Airspeed True","knots");

like the RequestData sample from SimConnect SDK.

 

When I run FSX, Altitude, Latitude and Longitude datas are correct, but heading and speed give me some funny values.

Are my definitions wrong ? Or do I need to convert the heading and speed values ?

 

 

Thank you for help...

 

Davy

Did you want heading in radians?  You'd have to convert it to degrees by multiplying it by 180/PI if I remember. 

 

Gregg

Gregg Seipp

"A good landing is when you can walk away from the airplane.  A great landing is when you can reuse it."
i9 64GB RAM, GTX-5090

  • Author

For funny values, this is what I've got :

 

 

2014-12-07  15:27:05.849 L  [iNFO]:  Log file, "LiveTiles.log", has been opened.
2014-12-07  15:27:05.849 L  [iNFO]:  DLLstart...
2014-12-07  15:27:07.887 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_OPEN...
2014-12-07  15:27:07.887 L  [iNFO]:  OnRecvOpen : create menu entry...
2014-12-07  15:27:10.840 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_EVENT...
2014-12-07  15:27:10.840 L  [iNFO]:  OnRecvEvent : SIM_START... [#0]
2014-12-07  15:27:31.369 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_EVENT...
2014-12-07  15:27:31.369 L  [iNFO]:  OnRecvEvent : SIM_START... [#1]
2014-12-07  15:27:32.247 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:32.248 L  [iNFO]:  Aircraft latitude : 0.003000 longitude : -0.007197 altitude : 1724.999996 heading : -1731497640 speed : 1073910191
2014-12-07  15:27:37.218 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:37.218 L  [iNFO]:  Aircraft latitude : 0.002343 longitude : -0.006309 altitude : 1737.872894 heading : -741805454 speed : 1073876476
2014-12-07  15:27:42.248 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:42.248 L  [iNFO]:  Aircraft latitude : 0.002337 longitude : -0.005052 altitude : 1613.741970 heading : -1273069681 speed : 1073053304
2014-12-07  15:27:47.208 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:47.208 L  [iNFO]:  Aircraft latitude : 0.003036 longitude : -0.003702 altitude : 1476.562808 heading : -1305919448 speed : 1072961660
2014-12-07  15:27:52.224 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:52.225 L  [iNFO]:  Aircraft latitude : 0.003785 longitude : -0.002346 altitude : 1341.971656 heading : -887307242 speed : 1072803769
2014-12-07  15:27:57.244 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:27:57.244 L  [iNFO]:  Aircraft latitude : 0.004799 longitude : -0.001117 altitude : 1160.765933 heading : 1249950545 speed : 1072565281
2014-12-07  15:28:02.194 L  [iNFO]:  DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...
2014-12-07  15:28:02.194 L  [iNFO]:  Aircraft latitude : 0.005956 longitude : -0.000031 altitude : 1058.595231 heading : -1447998764 speed : 1072325553
2014-12-07  15:28:07.523 L  [iNFO]:  DLLStop...
====[ END OF CURRENT LOG ]====
 

Even if I convert from rad to deg or deg to rad the heading value, I still have wrong heading ... :wacko:

 

When I run FSX, I'm using a low speed aircraft...

Can you provide a snippet of where you're storing the variable and the line you're using for logging?

Gregg Seipp

"A good landing is when you can walk away from the airplane.  A great landing is when you can reuse it."
i9 64GB RAM, GTX-5090

  • Author

Here it is , all my code:

 

I use for my logging this library : CppLogLib_0_3_1

#include "stdafx.h"
#include <iostream>

#include <SimConnect\SimConnect.h>

#include "CppLogLib_0_3_1\LogFile\Log.h"


using namespace std;

// Logger
	LogFile_t mLogger;


// Inner
	int SimStartCounter;
// Menu


// Données à recueiller
struct Struct1
{
	double altitude;
	double altitudeAboveGround;
	double latitude;
	double longitude;
	double heading;
	double trueAirSpeed;
};

// Simconnect datas
HANDLE hSimConnect;

enum EVENT_ID
{
	MAIN_MENU = 1,
	SIM_START
} ;

enum REQUEST_ID
{
	SHOW_WINDOW,
} ;

enum DATA_DEFINE_ID
{
	DEFINITION_1
} ;

enum DATA_REQUEST_ID
{
	REQUEST_1
} ;


void SetupStructDefinitions()
{
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Altitude","feet");
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Alt Above Ground","feet");
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Latitude","degrees");
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Longitude","degrees");
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Plane Heading Degrees Magnetic","radians", SIMCONNECT_DATATYPE::SIMCONNECT_DATATYPE_FLOAT64, 0.0f, SIMCONNECT_UNUSED);
	SimConnect_AddToDataDefinition(hSimConnect,DEFINITION_1,"Airspeed True","knots");
}

void onRecvOpen(SIMCONNECT_RECV_OPEN *pOpen)
{
	mLogger->Info("OnRecvOpen : create menu entry...");

	SimConnect_MenuAddItem(hSimConnect, "Live Tiles",MAIN_MENU,0);
}

void onRecvEvent(SIMCONNECT_RECV_EVENT *pEvent)
{
	switch(pEvent->uEventID)
	{
	case MAIN_MENU :
		{
			mLogger->Info("OnRecvEvent : MAIN_MENU...");
			break;
		}
	case SIM_START:
		{
			mLogger->Info("OnRecvEvent : SIM_START... [#%d]",SimStartCounter);
			
			if (SimStartCounter > 0)
				SimConnect_RequestDataOnSimObject(hSimConnect,REQUEST_1,DEFINITION_1,SIMCONNECT_OBJECT_ID_USER,SIMCONNECT_PERIOD_SECOND,0,0,5,0);
	
			SimStartCounter++;
						
			break;
		}
	}
}

void onRecvSimObjectData(SIMCONNECT_RECV_SIMOBJECT_DATA *pObjData)
{
	switch (pObjData->dwRequestID)
	{
	case REQUEST_1:
		{
			Struct1 * pstruct1 = (Struct1*) &pObjData->dwData;
			mLogger->Info("Aircraft latitude : %f longitude : %f altitude : %f heading : %d speed : %d",pstruct1->latitude, pstruct1->longitude, pstruct1->altitude, pstruct1->heading, pstruct1->trueAirSpeed);
			break;
		}
	}
}

void CALLBACK DispatchProcedure(SIMCONNECT_RECV *pData, DWORD chData,void *pContext)
{
	switch(pData->dwID)
	{
	case SIMCONNECT_RECV_ID_OPEN:
		{
			mLogger->Info("DispatchProcadure call : SIMCONNECT_RECV_ID_OPEN...");
			onRecvOpen((SIMCONNECT_RECV_OPEN *) pData);
			break;
		}
	case SIMCONNECT_RECV_ID_EVENT:
		{
			mLogger->Info("DispatchProcadure call : SIMCONNECT_RECV_ID_EVENT...");
			onRecvEvent((SIMCONNECT_RECV_EVENT *) pData);
			break;
		}
	case SIMCONNECT_RECV_ID_SIMOBJECT_DATA:
		{
			mLogger->Info("DispatchProcadure call : SIMCONNECT_RECV_ID_SIMOBJECTDATA...");
			onRecvSimObjectData((SIMCONNECT_RECV_SIMOBJECT_DATA *) pData);
			break;
		}
	}
}
void __stdcall DLLStart(void)
{
	SimStartCounter = 0;
//	BOOST_LOG_TRIVIAL(info) << "DLLStart";
	const string LogName = "f:\\LiveTiles.log";

	Logger::Init(LogName.c_str(), true, false);	// this file (no path included) gets created in the current working directory.
	mLogger = Logger::GetLog();			// get the pointer through which logging takes place.


	if ( mLogger.get() == NULL || mLogger->IsProblem() )	// one can check for error conditions in the logger.
	{
		if ( mLogger.get() == NULL )
			cout << "\n" << "Failed to initialize (open/create) the log file, " << LogName << endl;
		else
			cout << "\n" << mLogger->GetErrorMessage() << endl;
	}
	else
	{
		mLogger->Info("Log file, \"%s\", has been opened.", "LiveTiles.log");
		mLogger->Info("DLLstart...");
	}

	
	if (SUCCEEDED(SimConnect_Open(&hSimConnect,"LiveTiles_DLL",NULL,0,NULL,SIMCONNECT_OPEN_CONFIGINDEX_LOCAL)))
	{
		SetupStructDefinitions();
		SimConnect_SubscribeToSystemEvent(hSimConnect, SIM_START, "SimStart");
		SimConnect_CallDispatch(hSimConnect,DispatchProcedure,NULL);
	}
}

void __stdcall DLLStop(void)
{
//	BOOST_LOG_TRIVIAL(info) << "DLLStop";
	mLogger->Info("DLLStop...");

	SimConnect_Close(hSimConnect);
}

Still looking for the problem...

Try changing those %d in your log line to %f and see what happens.

 

Gregg 

Gregg Seipp

"A good landing is when you can walk away from the airplane.  A great landing is when you can reuse it."
i9 64GB RAM, GTX-5090

  • Author

Ok, I found my errors .... :rolleyes:

 

 

mLogger->Info("Aircraft latitude : %f longitude : %f altitude : %f heading : %d speed : %d",pstruct1->latitude, pstruct1->longitude, pstruct1->altitude, pstruct1->heading, pstruct1->trueAirSpeed);

 

It should be :

mLogger->Info("Aircraft latitude : %f longitude : %f altitude : %f heading : %f speed : %f",pstruct1->latitude, pstruct1->longitude, pstruct1->altitude, pstruct1->heading, pstruct1->trueAirSpeed);

Anyway, thank's a lot for you help Gregg_Seip...


Ahhh, you answered when I was writting my post...

 

Thank you

Create an account or sign in to comment
Go to topic listing

Account

Navigation

Search

Search

Configure browser push notifications
Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.