error C2061 when compilling

hey guys,

i have this weird problem. i have a native dll i did. i create a struct in it, and declare a pointer and use it in a function member in a class. i compile this native dll with absolutely no problem at all.

i come to wrap this native dll in a managed dll. i include the header file of the native and the lib file, and compile without using the code from native dll. and i get a "error C2061: syntax error : identifier 'NMaterial'" in the native dll.

why is that

here is my native dll code
[code]
// the structure
#ifndef NMATERIAL_DEFINED
typedef struct NMaterial: public D3DMATERIAL9
{
 public:
     NMaterial()
     {}
}NMaterial, *LPNMaterial;
#define NMATERIAL_DEFINED
#endif

// the class
class NDeviceMaterial
{
public:
    NDeviceMaterial();
    ~NDeviceMaterial(void);

    void SetMaterial( NMaterial );
};
[/code]

and in my managed dll i wrote this in the stdafx.h file:

[code]
#pragma once
#include <nrenderd3d.h>
#include "windows.h"

#pragma comment(lib, "nrenderd3d.lib")
[/code]

note: nrenderd3d.h is the header file where i have all of my headers so i can use in other dlls.

the nrenderd3d.h has the following:

[code]

#pragma once