Using a native C struct in Managed C++

[PaulM1985]

Hi

I am trying to make a C wrapper around some native code so that I can use it in an Azure Web Service. As far as I am aware, Azure only allows pinvoke on C functions and does not allow for interop on to C++.

I am getting some link errors with regard to using a C struct in a C++/CLI wrapper. Here is my code:

PointCloudGenerator.h (Native dll)

#ifdef MESHGENERATIONNATIVE_EXPORTS
#define MESHGENERATIONNATIVE_API __declspec(dllexport)
#else
#define MESHGENERATIONNATIVE_API __declspec(dllimport)
#endif

struct Vector3d
{
	double x;
	double y;
	double z;
};

extern "C" MESHGENERATIONNATIVE_API void PCGen_Sphere(const Vector3d& centre, double radius, int numPoints, Vector3d* pPointList);

PointCloudGenerator.cpp (Native dll)

#include "stdafx.h"

#include "PointCloudGenerator.h"

#include <cstdlib>
#include <cmath>

MESHGENERATIONNATIVE_API void PCGen_Sphere(const Vector3d& centre, double radius, int numPoints, Vector3d* pPointList)
{
	static double PI = atan(1) * 4;

	// First test create a series of true points representing a 3x2 grid
	// in X/Y space
	for (int i = 0; i < numPoints; ++i)
	{
//		double angleA = 2 * PI * (double) rand() / RAND_MAX;
		double angleA = PI * (double) rand() / RAND_MAX;
//		double angleB = 2 * PI * (double) rand() / RAND_MAX;
		double angleB = PI * (double) rand() / RAND_MAX;

		double x = centre.x + radius * cos(angleA) * sin(angleB);
		double y = centre.y + radius * sin(angleA) * sin(angleB);
		double z = centre.z + radius * cos(angleB);

		pPointList[i].x = x;
		pPointList[i].y = y;
		pPointList[i].z = z;
	}
}

Now for my managed wrapper:
PointCloudGeneratorWrap.cpp

#include "stdafx.h"

#include "PointCloudGeneratorWrap.h"

#include "../MeshGenerationNative/MeshGenerationNative.h"
#include "../MeshGenerationNative/PointCloudGenerator.h"

namespace MeshGenerationWrapper
{
	PointCloudGeneratorWrap::PointCloudGeneratorWrap()
	{
	}

	bool
	PointCloudGeneratorWrap::CreateSphere()
	{
		bool success = true;

		int value = fnMeshGenerationNative();

		try
		{
			Vector3d centre;
			double radius = 5;

			static const int numPoints = 500;
			Vector3d points[numPoints];

			PCGen_Sphere(centre, radius, numPoints, points);

			int hello = 0;
		}
		catch (...)
		{
			success = false;
		}

		return true;
	}
}

I am getting the following link error when building my managed dll:

1>PointCloudGeneratorWrap.obj : error LNK2032: metadata inconsistent with COFF symbol table: symbol '?PCGen_Sphere@@$$J0YAXAEBUVector3d@@NHPEAU1@@Z' (0A00000D) mapped to '<unknown symbol>' (06000021) in PointCloudGenerator.obj
1>PointCloudGeneratorWrap.obj : error LNK2019: unresolved external symbol "extern "C" void __cdecl PCGen_Sphere(struct Vector3d const &,double,int,struct Vector3d *)" (?PCGen_Sphere@@$$J0YAXAEBUVector3d@@NHPEAU1@@Z) referenced in function "public: bool __clrcall MeshGenerationWrapper::PointCloudGeneratorWrap::CreateSphere(void)" (?CreateSphere@PointCloudGeneratorWrap@MeshGenerationWrapper@@$$FQE$AAM_NXZ)

I am assuming that I am doing something wrong in exporting my C Struct. Any advice on how to fix this would be greatly appreciated.

Paul