error LNK2005: "already defined in SkinHeaderCtrl.obj"

Question

I am Getting this error "Error 2 error LNK2005: "public: virtual __thiscall CMemDC::~CMemDC(void)" (??1CMemDC@@UAE@XZ) already defined in SkinHeaderCtrl.obj C:\Users\anthonyd\Desktop\ASPX\STP\nafxcwd.lib(afxglobals.obj) STP "

I have read through many similar questions but can not find what fits. Could someone help please?

   // SkinHeaderCtrl.cpp : implementation file
//

#include "stdafx.h"
#include "STP.h"
#include "SkinHeaderCtrl.h"
#include "memdc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define BACKGROUND RGB(218,218,218)// was 218,218,218
#define HEIGHT 16
/////////////////////////////////////////////////////////////////////////////
// CSkinHeaderCtrl

CSkinHeaderCtrl::CSkinHeaderCtrl()
{
}

CSkinHeaderCtrl::~CSkinHeaderCtrl()
{
}


BEGIN_MESSAGE_MAP(CSkinHeaderCtrl, CHeaderCtrl)
    //{{AFX_MSG_MAP(CSkinHeaderCtrl)
    ON_WM_PAINT()
    ON_WM_ERASEBKGND()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSkinHeaderCtrl message handlers

void CSkinHeaderCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{

}

void CSkinHeaderCtrl::OnPaint() 
{
    CPaintDC dc(this); // device context for painting

    CRect rect, rectItem, clientRect;
    GetClientRect(&rect);
    GetClientRect(&clientRect);
    CMemDC memDC(&dc, rect);
    CDC bitmapDC;
    bitmapDC.CreateCompatibleDC(&dc);

//  memDC.FillSolidRect(&rect, RGB(76,85,118));
    memDC.FillSolidRect(&rect, BACKGROUND);

    CBitmap bitmapSpan;
    bitmapSpan.LoadBitmap(IDB_COLUMNHEADER_SPAN);
    CBitmap* pOldBitmapSpan = bitmapDC.SelectObject(&bitmapSpan);

//  memDC.StretchBlt(rect.left+2, 0, rect.Width(), 12, &bitmapDC, 0, 0, 1, 12, SRCCOPY);
    memDC.StretchBlt(rect.left+2, 0, rect.Width(), HEIGHT, &bitmapDC, 0, 0, 1, 12, SRCCOPY);

    bitmapDC.SelectObject(pOldBitmapSpan);
    bitmapSpan.DeleteObject();

    int nItems = GetItemCount();

    CBitmap bitmap;
    CBitmap bitmap2;
    CBitmap bitmap3;

Here is the skinheaderctrl.h

#if !defined(AFX_SKINHEADERCTRL_H__8B0847B1_B4E6_4372_A62D_038582FFEA5C__INCLUDED_)
#define AFX_SKINHEADERCTRL_H__8B0847B1_B4E6_4372_A62D_038582FFEA5C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// SkinHeaderCtrl.h : header file
//


/////////////////////////////////////////////////////////////////////////////
// CSkinHeaderCtrl window

class CSkinHeaderCtrl : public CHeaderCtrl
{
// Construction
public:
    CSkinHeaderCtrl();

// Attributes
public:

// Operations
public:

// Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CSkinHeaderCtrl)
    //}}AFX_VIRTUAL

// Implementation
public:
    virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
    virtual ~CSkinHeaderCtrl();

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

    DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_SKINHEADERCTRL_H__8B0847B1_B4E6_4372_A62D_038582FFEA5C__INCLUDED_)

Update

On the skinheaderctrl.cpp I have a includes #include "memdc.h" do I want to update this to CMemDC?

Answer 1

CMemDC is an internal helper class in MFC (see Internal Classes). You've apparently defined your own CMemDC class, with the result that the linker is seeing two destructors with the same name. You'll either have to rename your class to something else or put it in a namespace to avoid the conflict.