Using native headers in C# project

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Hi everybody,

Here is my question. I have a native project with many headers and class that i try to wrap using c++/cli in order to have a dll that i could reference in my c# project.

In some moment i only have headers file (without the corresponding class) that contains only mathematical functions and i use them by including them in my project. My native project work very well.

When i have the header and the corresponding class i am able to wrap this. But when i only have the header with only many function i don't know how to wrap these.

What is the way for wrap these headers file ?

P.S : here is an example of headers that i try to wrap in C++/CLI

C++

#ifndef ASSIM_H
#define ASSIM_H

#include "et.h"

// Changes the given model parameter based on current temperature.
//   k25 (model parameter at 25 deg. C), q10 (Q10 value),
//   lftemp (leaf temperature, deg. C)
double Q10(double k25, double q10, double lftemp)
{
   return (k25 * pow(q10, (lftemp - 25.0) / 10.0));
}

// Rubisco capacity rate (umol m-2 s-1)
//   lftemp (leaf temperature, deg. C)
double Vcmax(double lftemp)
{
   double const VCMAX = 200.0;   // max rate
   double dExp = 1.0 + exp(0.128 * (lftemp - 40.0));
   return (Q10(VCMAX, 2.4, lftemp) / dExp);
}

// CO2 compensation point (umol mol-1)
//   lftemp (leaf temperature, deg. C)
double CO2CompensationPt(double lftemp)
{
   double const TAU = 2600.0;    // specificity factor
   double const OA = 210000.0;   // O2 concentration
   double dTau = Q10(TAU, 0.57, lftemp);
   return (OA * 0.5 / dTau);
}

What I have tried:

I try to create a ref class to encapsulate these functions/headers but i need use a pointer to the native class but the point is that this is not a class but only a list of functions that perform calculations.

Posted 26-Jul-16 23:17pm

naecotor

Updated 27-Jul-16 4:08am

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[no name] 27-Jul-16 9:21am

I never used it but maybe it can assist you: PInvoker - C#/VB.NET PInvoke Interface Generation Tools[^]

2 solutions

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KarstenK · Answer 1 · 2016-07-27T02:52:00

Solution 1

You cant avoid the work to write all declarations in C#. Take a look at my article Calling all Stations.

The point is to declare the C functions as undecorated.

Posted 27-Jul-16 2:52am

KarstenK

Comments

naecotor 27-Jul-16 13:56pm

Hi karstenk,

Thanks for your reply. My idea is build a C++/CLI wrapper. I try something some hours ago that it seems work without having to rewrite all declarations in c#.
Here is the "possible" solution i wrote (i don't know if it is correct).
So what i did is the following in the solution i propose. Is not a solution it seems that i made mistake for reply to your comment.

SD

naecotor · Answer 2 · 2016-07-27T04:08:00

Hi Karstenk,

Thanks for your reply. My idea is build a C++/CLI wrapper. I try something some hours ago that it seems work without having to rewrite all declarations in c#.
Here is the "possible" solution i wrote (i don't know if is correct).
So what i did is the following :

For my native header (assim.h) that is in my first message i defined a c++/cli class with :

1) assimWrapper.h

C++

// PaSimWrapper.h
#pragma once

#include "Stdafx.h"

namespace Wrapper{
	
	public ref class assimWrapper
	{
	public:
		double Q10Wrapped(double k25, double q10, double leafTemp);
		double CO2CompensationPtWrapped(double leafTemp);
		double VcmaxWrapped(double leafTemp);
		double LightLimitedWrapped(double par, double leafTemp, double ci);
		double RubiscoLimitedWrapped(double leafTemp, double ci);
		double SinkLimitedWrapped(double leafTemp);
		double LeafAssimWrapped(double par, double leafTemp);
		double HourCanopyAssimWrapped(double th, double leafTemp);
		double DayCanopyAssimWrapped();

	};
}

2) assimWrapper.cpp

C++

#include "Stdafx.h"
//#include "etWrapper.h"

#include "assim.h"
#include "assimWrapper.h"

namespace Wrapper
{
	///
	///
	double assimWrapper::Q10Wrapped(double k25, double q10, double leafTemp)
	{
		return Q10(k25, q10, leafTemp);
	}

	///
	///
	double assimWrapper::CO2CompensationPtWrapped(double leafTemp)
	{
		return CO2CompensationPt(leafTemp);
	}

	///
	///
	double assimWrapper::VcmaxWrapped(double leafTemp)
	{
		return Vcmax(leafTemp);
	}

	///
	///
	double assimWrapper::LightLimitedWrapped(double par, double leafTemp, double ci)
	{
		return LightLimited(par, leafTemp, ci);
	}

	///
	///
	double assimWrapper::RubiscoLimitedWrapped(double leafTemp, double ci)
	{
		return RubiscoLimited(leafTemp, ci);
	}

	///
	///
	double assimWrapper::SinkLimitedWrapped(double leafTemp)
	{
		return SinkLimited(leafTemp);
	}

	///
	///
	double assimWrapper::LeafAssimWrapped(double par, double leafTemp)
	{
		return LeafAssim(par, leafTemp);
	}

	///
	///
	double assimWrapper::HourCanopyAssimWrapped(double th, double leafTemp)
	{
		return HourCanopyAssimWrapped(th, leafTemp);
	}

	///
	///
	double assimWrapper::DayCanopyAssimWrapped()
	{
		return DayCanopyAssim();
	}
};

It seems working because i have access to my native functions in my c# project.

Do you think or other people that is correct ?

SD