unresolved external symbol

[ns]

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

:confused: thanks for helping, sb

[David Crow]

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

[Viorel]

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.

[ns]

Duh!:doh: 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

[Blake Miller]

What the others have said, and also, if you want ClassWizard to work correctly, you need to make all this stuff match ... // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CGraphCtrl) should be // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CScale) Be careful what you cut and paste - don't forget the edit! I've seen better runs in my shorts! - Patches O'Houlihan