Thread: multiple defs

More dll trouble -- when I include this header in multiple source files I get LINK2005 errors

all are along these lines

error LNK2005: "struct IDirect3D9 * g_pD3D" (?g_pD3D@@3PAUIDirect3D9@@A) already defined in Audio.obj

Code:

#ifndef REAL_EARTH_ENGINE_H
#define REAL_EARTH_ENGINE_H

#include <d3d9.h>
#define DIRECTINPUT_VERSION  0x0800
#include <dinput.h>
#include <dsound.h>
#include <string>

using std::string;

#define DECLSPEC __declspec( dllexport )

//Global Functions
DECLSPEC bool RE_Init(bool windowed);
DECLSPEC string RE_GetLastError(void);

//Global Variables
DECLSPEC LPDIRECT3D9 g_pD3D;
DECLSPEC LPDIRECT3DDEVICE9 g_pd3dDevice;
DECLSPEC HWND hWnd;

//Private Functions

//Private Variables
string error;

#endif

Thanks for any help,
MadCow

Oh, I hate those LNK2005 errors. I used to get them all the time. I even phoned microsoft tech support. I still got them occaisnally after that. That's why I switched to Mac.

Try a whole bunch of things. You can start off by making one general header file, and then including all the DirectX headers in there. Then use this code below to make sure that header isn't included twice:

Code:

#ifndef H_DIRECTXHEADERFILE
#define H_DIRECTXHEADERFILE
.
. // put direct x header includes here
.
#endif

If that doesn't work, try adding the directx headers to your precompiled header. That also worked for me.

Good luck with it.

Thanks, but the errors don't come from the dx headers. They all come from this block

Code:

#define DECLSPEC __declspec( dllexport )

//Global Functions
DECLSPEC bool RE_Init(bool windowed);
DECLSPEC string RE_GetLastError(void);

//Global Variables
DECLSPEC LPDIRECT3D9 g_pD3D;
DECLSPEC LPDIRECT3DDEVICE9 g_pd3dDevice;
DECLSPEC HWND hWnd;

_edit

just quoting more errors, kind of redunant

Basic.obj : error LNK2005: "struct IDirect3DDevice9 * g_pd3dDevice" (?g_pd3dDevice@@3PAUIDirect3DDevice9@@A) already defined in Audio.obj
Basic.obj : error LNK2005: "struct HWND__ * hWnd" (?hWnd@@3PAUHWND__@@A) already defined in Audio.obj
Basic.obj : error LNK2005: "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > error" (?error@@3V?$basic_string@DU?$char_traits@D@std@@V ?$allocator@D@2@@std@@A) already defined in Audio.obj
Network.obj : error LNK2005: "struct IDirect3D9 * g_pD3D" (?g_pD3D@@3PAUIDirect3D9@@A) already defined in Audio.obj

Aha, function related errors fixed (needed to add extern before DECLSPEC)

Now all I have is the global variables. I removed DECLSPEC from their decleration so I really don't understand why there is still trouble...I've used multiple source files before and the inclusion gaurd has always stopped them from throwing redecleration errors in each .cpp file until now it seems

Yay! everything solved. Here's what works

Code:

#ifndef REAL_EARTH_ENGINE_H
#define REAL_EARTH_ENGINE_H

#include <d3d9.h>
#define DIRECTINPUT_VERSION  0x0800
#include <dinput.h>
#include <dsound.h>
#include <string>

using std::string;

#define DECLSPEC __declspec( dllexport )

//Global Functions
extern DECLSPEC bool RE_Init(bool windowed);
extern DECLSPEC string RE_GetLastError(void);

//Global Variables
static LPDIRECT3D9 g_pD3D;
static LPDIRECT3DDEVICE9 g_pd3dDevice;
static HWND hWnd;

//Private Functions

//Private Variables
static string error;

#endif