[isugamedev-devel] Windoze link errors

[Jon <jk...@mu...>]

Hi People,

I've been knocking this around for awhile so I thought I'd see if any of 
you can see any obvious errors with this code I'm working on.
I'm using Win32 code for handling the OpenGL window.  As some of my 
routines have gotten long I wanted to split the WinMain.cpp (containing the 
Game loop, rendering routine, startup, shutdown, etc.) into different 
files.  All I've done so far is put all the #includes, #defines, Windows 
handles, and function declarations into a file called WinMain.h and 
#include "WinMain.h" in WinMain.cpp.  BUT, WinMain.h is also included in 
one of my other header files (3DModel.h).  When I compile I get the link 
errors:

3DModel.obj : error LNK2005: "struct HWND__ *  hWnd" (?hWnd@@3PAUHWND__@@A) 
already defined in WinMain.obj

I'm confused because I used a code example off GameTutorials.com and he 
does exactly what I have described here and it works fine.
Any clues??

Thanks,

Jon

Here's what the declarations basically look like::

WinMain.h ---

#ifndef _WINMAIN_H
#define _WINMAIN_H

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
....

extern HDC	 hDC=NULL;		
extern HGLRC hRC=NULL;
...

int WINAPI WinMain(	HINSTANCE hInstance, HINSTANCE	hPrevInstance,	 LPSTR 
lpCmdLine, int nCmdShow);
LRESULT CALLBACK WndProc( ....
...
#endif

WinMain.cpp ---

#include "WinMain.h"
#include "3DModel.h"
...

3DObject.h --

#ifndef .....

#include "WinMain.h"
....
#endif

3DObject.cpp ---

#include "3DObject.h"