[PDK] How to get Custom Variable ? (C:<Module Name>:<Variable>)

[a8325811]

Hi, I want to get the custom variable like this.

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C:POI:SelectedTargetName 

But I can't figure our how to get this variable in C++ PDK project ?

Does anyone know ? Thanks.

[JB3DG]

This might help:

https://forums.vrsimulations.com/suppor ... ia_C.2B.2B

[a8325811]

This might help:

https://forums.vrsimulations.com/suppor ... ia_C.2B.2B

Hi, thanks your reply, I try this method, but when I compile the code, there some warning show.

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LNK2020 unresolved token ImportTable
LNK2001 unresolved external symbol ImportTable
LNK1120 2 unresolved externals

I have try some solution I found, like add .lib file to Linker, but I can't find like gauges.lib file in PDK foldor.
Do you have any idea about this ? Thanks

[JB3DG]

There isn't a gauges.lib. You got something like this in your code somewhere?

GAUGESIMPORT ImportTable = {
{ 0x0000000F, (PPANELS)NULL },
{ 0x00000000, NULL }
};

GAUGESLINKAGE Linkage =
{
0x00000013,
module_init,
module_deinit,
0,
0,
FS9LINK_VERSION,
{
&gaugehdr_ACM,
&gaugehdr_Sys,
0
}
};

[a8325811]

I add this in my code.

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#include "gauges.h"
void DataCollector::OnFrame(IParameterListV400* pParams)
{
	IPanelCCallback *pPCC_TPUtil = panel_get_registered_c_callback("VRSTP_Util");
	IAircraftCCallback *pACC_TPUtil = pPCC_TPUtil->CreateAircraftCCallback(0);
	IGaugeCCallback *pGCC_TPUtil = pACC_TPUtil->CreateGaugeCCallback();
};

And I check all code, only in gauges.h file have these ImportTable thing, like this.

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#define panel_get_registered_c_callback (ImportTable.PANELSentry.fnptr->panel_get_registered_c_callback)
#define panel_get_aircraft_c_callback   (ImportTable.PANELSentry.fnptr->panel_get_aircraft_c_callback)
#define send_key_event  (ImportTable.PANELSentry.fnptr->send_key_event)
#define register_key_event_handler  (ImportTable.PANELSentry.fnptr->register_key_event_handler)
#define unregister_key_event_handler    (ImportTable.PANELSentry.fnptr->unregister_key_event_handler)
#define process_shared_event_out    ( ImportTable.PANELSentry.fnptr->process_shared_event_out)
#define is_master ( ImportTable.PANELSentry.fnptr->is_master)
#define set_named_variable_value_sync  (ImportTable.PANELSentry.fnptr->set_named_variable_value_sync)
#define set_named_variable_sync_enabled (ImportTable.PANELSentry.fnptr->set_named_variable_sync_enabled)
#define get_event_description (ImportTable.PANELSentry.fnptr->get_event_description)
#define get_event_token_string (ImportTable.PANELSentry.fnptr->get_event_token_string)
#define query_pdk (ImportTable.PANELSentry.fnptr->query_pdk)
#define get_event_count (ImportTable.PANELSentry.fnptr->get_event_count)
#define get_event_id_by_index (ImportTable.PANELSentry.fnptr->get_event_id_by_index)

// This is the gauge's import table definition
typedef struct GAUGESIMPORT
{
    struct
    {
        ID          fnID;
        PPANELS     fnptr;
    }PANELSentry;

    struct
    {
        ID          fnID;
        PVOID       fnptr;
    }nullentry;
} GAUGESIMPORT, *PGAUGESIMPORT;

EXTERN_C DECLSPEC_EXPORT GAUGESIMPORT ImportTable;

#if defined(_MSC_VER) 
#pragma warning( push )
#pragma warning( disable:4200 )
#endif

// This is the module's export table definition
typedef struct  GAUGESLINKAGE
{
    FSLINKAGE
    PGAUGEHDR       gauge_header_ptr[];
} GAUGESLINKAGE, *PGAUGESLINKAGE, **PPGAUGESLINKAGE;

#if defined(_MSC_VER) 
#pragma warning( pop )
#endif

EXTERN_C DECLSPEC_EXPORT    GAUGESLINKAGE   Linkage;

Are this file shoud fix?

[JB3DG]

Are you running a C++ gauge or a C++ module loaded via the dll.xml?

[a8325811]

Are you running a C++ gauge or a C++ module loaded via the dll.xml?

I use the Official PDK C++ Example, DataHarvester.

So I not use dll.xml in my project.

[JB3DG]

Look up the C: var module example in the SDK for how to set up the import table.

[a8325811]

Look up the C: var module example in the SDK for how to set up the import table.

Ok, I will look into it, and then report to you.

[a8325811]

Look up the C: var module example in the SDK for how to set up the import table.

Hi, here is my code.

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PPANELS Panels = NULL;

GAUGESIMPORT ImportTable =
{
	{0x0000000F, (PPANELS)NULL},
	{0x00000000, NULL}
};

My_DataCollector::My_DataCollector()
{
	//Init
	ImportTable.PANELSentry.fnptr = (PPANELS)Panels;
};

void My_DataCollector::OnFrame(IParameterListV400* pParams)
{
	IPanelCCallback *pPCC_TPUtil = panel_get_registered_c_callback("VRSTP_Radar");
	IAircraftCCallback *pACC_TPUtil = pPCC_TPUtil->CreateAircraftCCallback(0);
	IGaugeCCallback *pGCC_TPUtil = pACC_TPUtil->CreateGaugeCCallback();

	SINT32 ID = 0;
	pPCC_TPUtil->ConvertStringToProperty("Mode4Code", &ID);

	FLOAT64 fReadVal = 0;
	pGCC_TPUtil->GetPropertyValue(ID, &fReadVal);
};

Now, the compiler is fine, but new question come, when I load this dll into Prepar3D, the P3D will CTD, I try to do some debug with my code, finally I got some error message on visual studio.

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System.NullReferenceException: Object reference not set to an instance of an object.

Do you have any idea? thanks

[JB3DG]

You should have a DllStart or module_init function in your dll that the simulator calls on load. That's where you should do the panel pointer assignment.

[a8325811]

You should have a DllStart or module_init function in your dll that the simulator calls on load. That's where you should do the panel pointer assignment.

Yes, finally I got the custom variable, I also find you must add a .def file and set in linker, so P3D will know to set Panel pointer.

[a8325811]

Remark for other people who want get Custom variable, here is my solution.

1.First create a Dll project like before, and write something like this in file.

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#include "initpdk.h"
#include "gauges.h"

using namespace P3D;

PPANELS Panels = NULL;

GAUGESIMPORT ImportTable =
{
	{0x0000000F, (PPANELS)NULL},
	{0x00000000, NULL}
};

extern "C" __declspec(dllexport) void __stdcall DLLStart(__in __notnull IPdk* pPdk)
{
	if (pPdk != nullptr && NULL != Panels)
	{
		//The Panels pointer will get filled in during the loading process
		ImportTable.PANELSentry.fnptr = (PPANELS)Panels;

		//Start Your Program
		s_My_DataCollector = new My_DataCollector;
	}
}

extern "C" __declspec(dllexport) void __stdcall DLLStop(void)
{
	//End Program
	delete s_My_DataCollector;
}

2.Add a .def file to your project, and write this.

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LIBRARY
EXPORTS
Panels
DLLStart
DLLStop

3.Write this .def file into visual studio Linker\Input\Module Definition File.
(eg. myDefine.def)

4.Last, use this statement in your program to get custom variable.

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void My_DataCollector::Update(CComPtr<IBaseObjectV400> &userObj)
{
	//Get Custom Variable
	IPanelCCallback *pPCC_TPUtil = panel_get_registered_c_callback("Module_Name");
	IAircraftCCallback *pACC_TPUtil = pPCC_TPUtil->CreateAircraftCCallback(0);
	IGaugeCCallback *pGCC_TPUtil = pACC_TPUtil->CreateGaugeCCallback();

	SINT32 ID = 0;
	pPCC_TPUtil->ConvertStringToProperty("Variable_Name", &ID);

	FLOAT64 fReadVal = 0;
	pGCC_TPUtil->GetPropertyValue(ID, &fReadVal);
	
	//This is what you want
	fReadVal;
};

Hope these can help someone. And thanks again JB3DG help.