C / C++ / MFC

Re: Link error using [modified]

15-Jun-06 3:52

this is the error:
error LNK2001: unresolved external symbol "class std::basic_string<c...

This is what I have at the top of the cpp file:

#include <string>

using std::

At this point VS gives me a short list that doesn't look like the string class. It shows:
_Bool_allocator
_Vbase
_VBITS
vector
Vector <class_Bool, class alocator<_Vbase>

Any idea on why I'm not getting the right class?

Thanks,

Jim

Jun Du15-Jun-06 4:17

15-Jun-06 4:17

Should it be:

using namespace std;

- It's easier to make than to correct a mistake.

jimNLX15-Jun-06 4:32

15-Jun-06 4:32

I still get the same error when I use this...

Jun Du15-Jun-06 4:58

15-Jun-06 4:58

It usually has something to do with linked libraries.

What compiler are you using?

What runtime library settings are you using?

Have you tried a Rebuild All?

- It's easier to make than to correct a mistake.

jimNLX15-Jun-06 5:07

15-Jun-06 5:07

I have rebuilt everything many times.

I'm using ../vc98/lib and ../vc98/mfc/lib

I'm compliling with Visual C++ 6.0

Thanks for the help, I'm really lost on how to debug this..

Jim

Jun Du15-Jun-06 5:43

15-Jun-06 5:43

I mean what C/C++ run-time libraries you are linking.

Could you add "msvcprt.lib" to the additional libraries?

- It's easier to make than to correct a mistake.

jimNLX15-Jun-06 6:37

15-Jun-06 6:37

msvcprt.lit wasn't in the additional libraries so I added it and re-compiled everything and still received the same errors.

this is the whole error, it may help:

error LNK2001: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl GetConfiguredClientTypes(class std::vector<class std::basic_string<char,struct std::char_traits<
char>,class std::allocator<char> >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > *)" (?GetConfiguredClientTypes@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAV
?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@2@@Z)

thanks again!

Jun Du15-Jun-06 7:05

Re: Link error using [modified]

15-Jun-06 7:05

Could you check two things:

1) Whick one of the following appears in your linker settings:

/ML
/MT
/MD
/MLd
/MTd
/MDd

Let me know if more than one are being used.

2) Does your app load any other modules (DLLs)?

- It's easier to make than to correct a mistake.

jimNLX15-Jun-06 7:12

15-Jun-06 7:12

/MLd is the only one I saw in there.

The app does load 1 DLL*****I take that back, it doesn't link to a dll

-- modified at 13:32 Thursday 15th June, 2006

Jun Du15-Jun-06 8:15

15-Jun-06 8:15

If you've set /nodefaultlibs, try to scrap it.

- It's easier to make than to correct a mistake.

jimNLX15-Jun-06 9:38

15-Jun-06 9:38

haven't set that.

jimNLX16-Jun-06 6:48

16-Jun-06 6:48

Anybody else have any ideas on where to go from here?

It really seems like the info from <string> is getting stepped on or something.

Help I'm totally stuck!!

Thanks,

Jim

jimNLX16-Jun-06 10:31

unresolved external symbol

16-Jun-06 10:31

Would it make a difference that I have both C & CPP files in this project?

ns15-Jun-06 3:37

15-Jun-06 3:37

My class h file is

class CScale : public CStatic
{
// Construction
public:
	CScale();

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CGraphCtrl)
	public:



	protected:

	protected:
	virtual BOOL OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult);
	virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	//}}AFX_VIRTUAL

// Implementation
public:
	CFont m_font;
	COLORREF *BC, BGC;

	// Generated message map functions
protected:
	//{{AFX_MSG(CScale)
	afx_msg BOOL OnPaint(CDC* pDC);
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

I have all the function bodies in the cpp file.
When I compile I get:

GraphCtrl.obj : error LNK2001: unresolved external symbol "protected: virtual struct AFX_MSGMAP const * __thiscall CScale::GetMessageMap(void)const " (?GetMessageMap@CScale@@MBEPBUAFX_MSGMAP@@XZ)
Release/RunCadMFCDLL.dll : fatal error LNK1120: 1 unresolved externals

thanks for helping,
sb

David Crow15-Jun-06 3:45

David Crow

15-Jun-06 3:45

Do you have BEGIN_MESSAGE_MAP() in your class' .cpp file?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

ns15-Jun-06 4:41

15-Jun-06 4:41

Duh!

I made the cpp file from scratch (the class wizard didn't make it), and I did not even think about the message map section needing to be in there (though I know its always there. thanks to both of you - you diagnosed it right away
sb

Viorel.15-Jun-06 3:53

Viorel.

15-Jun-06 3:53

It seems that for your CScale control there is no corresponding BEGIN_MESSAGE_MAP/END_MESSAGE_MAP zone (created by Class Wizard) in CPP file.

Open the CPP file where the implementation of CScale class is provided, and check if there is a BEGIN_MESSAGE_MAP and END_MESSAGE_MAP macros here, something like this:

BEGIN_MESSAGE_MAP(CScale, CStatic)
    // . . .
END_MESSAGE_MAP()

In addition, check if your CPP file is included in the project, i.e. is listed in the Solution Explorer panel, and is not excluded from build process.

Hope it helps.