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Re: [Dev-C++] linker errors
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From: Vlada D. <dj...@im...> - 2003-06-13 13:19:43
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----- Original Message -----
From: "Vlada Djurovic" <dj...@im...>
To: "Per Westermark" <pw...@ia...>
Cc: "'DevC++ help'" <dev...@li...>
Sent: Friday, June 13, 2003 2:24 PM
Subject: Re: [Dev-C++] linker errors
>
> ----- Original Message -----
> From: "Per Westermark" <pw...@ia...>
> To: "Vlada Djurovic" <dj...@im...>
> Cc: "'DevC++ help'" <dev...@li...>
> Sent: Friday, June 13, 2003 1:44 PM
> Subject: Re: [Dev-C++] linker errors
>
>
> > You didn't exactly send any source code for us to look at...
> >
> > However, if you get multiple declarations of _pGame, I would suspect
that
> > one header file contains a line 'GameEngine *pGame;' or similar. If that
> > include file is used by more than one cpp file (main.cpp and
> > GameEngine.cpp) then you'll get a link error.
> >
> > In the header, the declaration should say 'extern GameEngine *pGame;'
and
> > then in one of the source files, there should be a 'GameEngine *pGame;'.
> >
> > Is GameEngine::m_pGameEngine declared as static? In that case, you
should
> > declare a variable of that type in one of the cpp files.
> >
> > /Per W
> >
> Man, this was great!!!!! This is exactly what happens. And you knew it
> without even looking at the source? You must be psychic( I hope I spelled
it
> right :-)).
> I didn't send any source, because there are 6 files and I didn't know
> exactly what to send. However, the multiple definitions are gone now. As
for
> the m_pGameEngine, it is declared like this:
>
> class GameEngine
> {
> protected:
>
> static GameEngine* m_pGameEngine;
> HINSTANCE m_hInstance;
> HWND m_hWindow;
> TCHAR m_szWindowClass[32];
> TCHAR m_szTitle[32];
> WORD m_wIcon,m_wSmallIcon;
> int m_iWidth,m_iHeight;
> int m_iFrameDelay;
> BOOL m_bSleep;
>
> public:
> //konstruktor i destruktor
> GameEngine(HINSTANCE hInstance,LPTSTR szWindowClass,LPTSTR szTitle,WORD
> wIcon,WORD wSmallIcon,
> int iWidth=600,int iHeight=480);
> virtual ~GameEngine();
>
> //opsti metod
> static GameEngine* GetEngine(){return m_pGameEngine;};
> BOOL Initialize(int iCmdShow);
> LRESULT HandleEvent(HWND hWindow,UINT mag,WPARAM wParam,LPARAM lPAram);
>
> //metodi pristupa
> HINSTANCE GetInstance(){return m_hInstance;};
> HWND GetWindow(){return m_hWindow;};
> void SetWindow(HWND hWindow){m_hWindow=hWindow;};
> LPTSTR GetTitle(){return m_szTitle;};
> WORD GetIcon(){return m_wIcon;};
> WORD GetSmallIcon(){return m_wSmallIcon;};
> int GetWidth(){return m_iWidth;};
> int GetHeight(){return m_iHeight;};
> int GetFrameDelay(){return m_iFrameDelay;};
> void SetFrameRate(int iFrameRate){m_iFrameDelay=1000/iFrameRate;};
> BOOL GetSleep(){return m_bSleep;};
> void SetSleep(BOOL bSleep){m_bSleep=bSleep;};
> };
> and the constructor is defined like this:
>
> GameEngine::GameEngine(HINSTANCE hInstance,LPTSTR szWindowClass,LPTSTR
> szTitle,WORD wIcon,
> WORD wSmallIcon,int iWidth,int iHeight)
> {
> m_pGameEngine=this;
> m_hInstance=hInstance;
> m_hWindow=NULL;
> if(lstrlen(szWindowClass)>0)
> lstrcpy(m_szWindowClass,szWindowClass);
> if(lstrlen(szTitle)>0)
> lstrcpy(m_szTitle,szTitle);
> m_wIcon=wIcon;
> m_wSmallIcon=wSmallIcon;
> m_iWidth=iWidth;
> m_iHeight=iHeight;
> m_iFrameDelay=50;
> m_bSleep=TRUE;
> }
> Are you saying that I should declare the variable of that type instead of
> 'this'?
> (If you think I should send entire source, I will, but I'm affraid it's
too
> long).
>
Forget that, I did some reading and worked it out.
>
> >
> > On Fri, 13 Jun 2003, Vlada Djurovic wrote:
> >
> > > Hi.
> > >
> > > I just got a book about games programming and I got stuck in the first
> step.
> > > When trying to compile an example from the book, I keep getting linker
> > > errors. The output looks like this:
> > >
> > > C:\Visual\engine\main.o
> > > [Warning] In function `GameEngine::GetFrameDelay(void)':
> > > //C/Visual/engine/main.cpp(.bss+0x0)
C:\Visual\engine\main.cpp(.bss+0x0)
> > > multiple definition of `_pGame'
> > > //C/Visual/engine/GameEngine.h C:\Visual\engine\skeleton.o(.bss+0x0)
> > > first defined here
> > > C:\Visual\engine\GameEngine.o
> > > [Warning] In function `_10GameEngineP11HINSTANCE__PcT2UsUsii':
> > >
> > > [Linker error] undefined reference to `GameEngine::m_pGameEngine'
> > >
> > >
> > > I can't figure out what this means. I tried looking for multiple
> definitions
> > > of _pGame, but I can't find any. Can something else be causing this?
> > > As for the other error, m_pGameEngine is a member of GameEngine class
> and
> > > it's referenced only in the class constructor. Can somebody give me a
> hint
> > > about possible problems?
> > >
> > > Thanks.
> > > ------------
> > > Vlada
> > >
> > >
> > >
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> >
>
>
>
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