unresolved external error

//anauel_init.h
#include "anaueld3d.h"

HRESULT CreateRenderDevice(HINSTANCE hDll, AnauEngine **aDevice)
{
	if(!*aDevice)
	{
		
		*aDevice = new anaueld3d(hDll);//line possibly with error
		return 0; //return A_OK quando estiver implementado o controle de erros
	}
	return 1;
}

//anauel.h
#define Max_Instances 8

class AnauEngine
{
	protected:
		HWND   		a_HwndMain;
        HWND        a_Hwnd[Max_Instances];  //limite de janelas de renderização
		UINT 		a_HwndCount; //número de janelas usadas
		UINT	 	a_ActiveWindowId; // Identificação da janela ativa
		HINSTANCE	a_Dll; //Usado para carregar a DLL
		DWORD		a_largura; //largura da tela
		DWORD		a_altura; //altura da tela
		bool		a_Windowed; //tela cheia ou janela?
		char		a_GpuId[256]; //Modelo da GPU
		FILE	   *a_Log; //Arquivo de log
		bool		a_Ativo; //Verifica se o engine está rodando


	public:
		AnauEngine(HINSTANCE) {};
		virtual ~AnauEngine(void)=0;	

		virtual HRESULT Init(HWND) =0;  //Inicializa o dispositivo para a janela solicitada
		virtual void Release(void) =0;
		virtual bool Ativo(void) =0;

		virtual HRESULT UseWindow(UINT Hwnd) =0;
		virtual HRESULT Render(bool ClearPixel, bool ClearDepth, bool ClearStencil) =0;
		virtual void StopRender(void) =0;
		virtual HRESULT Clear(bool ClearPixel, bool ClearDepth, bool ClearStencil) =0;
		virtual void SetClearColor(float Red, float Green, float Blue) =0;
};

typedef struct AnauEngine *ANAUENGINE;



extern "C" 
{
	HRESULT CreateRenderDevice(HINSTANCE hDll, AnauEngine **pInterface);
	typedef HRESULT (*CREATERENDERDEVICE) (HINSTANCE hDll, AnauEngine **pInterface);
	HRESULT ReleaseRenderDevice(AnauEngine **pInterface);
	typedef HRESULT (*RELEASERENDERDEVICE) (AnauEngine **pInterface);

}

//anaueld3d.h
#define Max_Instances 8

class anaueld3d : public AnauEngine
{
public:
	anaueld3d(HINSTANCE a_Dll);
	~anaueld3d(void);

	HRESULT Init(HWND);
	BOOL CALLBACK DlgProc(HWND, UINT, WPARAM, LPARAM);

	void Release(void);
	bool Ativo(void) {return a_Ativo;}
	HRESULT Render(bool, bool, bool);
	HRESULT Clear(bool, bool, bool);
	void StopRender(void);
	void SetClearColor(float, float, float);
	HRESULT UseWindow(UINT Hwnd);

private:
	//AnauD3DEnum			*a_Enum;
	LPDIRECT3D9			 a_D3D;
	LPDIRECT3DDEVICE9	 a_Device;
	LPDIRECT3DSWAPCHAIN9 a_Chain[Max_Instances];
	D3DPRESENT_PARAMETERS a_d3dpp;
	D3DCOLOR			 a_ClearColor;
	bool				 a_Rendering;
	bool				 a_Stencil;

	HRESULT				 Go(void);

	void Log(char *, ...);
};