如何把两个CMemDC类代码整合在一起？

[yschat2012]

在整合两个不同的代码时，两个不同的CMemDC类产生了冲突。现在想把它们整合在一起。但是一个只有memdc.h文件，另一个有memdc.cpp和memdc.h两个文件，不知怎么整合？
1、第一个memdc.h

#ifndef _MEMDC_H_
class CMemDC : public CDC
{
public:

    // constructor sets up the memory DC
    CMemDC(CDC* pDC) : CDC()
    {
        ASSERT(pDC != NULL);

        m_pDC = pDC;
        m_pOldBitmap = NULL;
        m_bMemDC = !pDC->IsPrinting();
              
        if (m_bMemDC)    // Create a Memory DC
        {
            pDC->GetClipBox(&m_rect);
            CreateCompatibleDC(pDC);
            m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
            m_pOldBitmap = SelectObject(&m_bitmap);
            SetWindowOrg(m_rect.left, m_rect.top);
        }
        else        // Make a copy of the relevent parts of the current DC for printing
        {
            m_bPrinting = pDC->m_bPrinting;
            m_hDC       = pDC->m_hDC;
            m_hAttribDC = pDC->m_hAttribDC;
        }
    }
    
    // Destructor copies the contents of the mem DC to the original DC
    ~CMemDC()
    {
        if (m_bMemDC) 
        {    
            // Copy the offscreen bitmap onto the screen.
            m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
                          this, m_rect.left, m_rect.top, SRCCOPY);

            //Swap back the original bitmap.
            SelectObject(m_pOldBitmap);
        } else {
            // All we need to do is replace the DC with an illegal value,
            // this keeps us from accidently deleting the handles associated with
            // the CDC that was passed to the constructor.
            m_hDC = m_hAttribDC = NULL;
        }
    }

    // Allow usage as a pointer
    CMemDC* operator->() {return this;}
        
    // Allow usage as a pointer
    operator CMemDC*() {return this;}

private:
    CBitmap  m_bitmap;      // Offscreen bitmap
    CBitmap* m_pOldBitmap;  // bitmap originally found in CMemDC
    CDC*     m_pDC;         // Saves CDC passed in constructor
    CRect    m_rect;        // Rectangle of drawing area.
    BOOL     m_bMemDC;      // TRUE if CDC really is a Memory DC.
};

#endif

2、第二个类是有memdc.cpp和memdc.h两个文件
memdc.h

class CMemDC : public CDC
{
// Construction
public:
	CMemDC(UINT heigh,UINT width);

// Attributes
public:

// Implementation
public:
	HBITMAP CloseMemDC();
	virtual ~CMemDC();

private:
	CBitmap  m_bitmap;      
    CBitmap* m_pOldBitmap;
	UINT m_bmpHeigh;
	UINT m_bmpWidth;
};

memdc.cpp

#include "stdafx.h"
#include "MemDC.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
CMemDC::CMemDC(UINT width,UINT heigh)
{   
	CDC *pDC = CDC::FromHandle(::GetDC(GetDesktopWindow()));
	ASSERT(pDC != NULL);
    CreateCompatibleDC(pDC);
	m_bmpWidth = width;
	m_bmpHeigh = heigh;
    m_bitmap.CreateCompatibleBitmap(pDC, m_bmpWidth, m_bmpHeigh);
    m_pOldBitmap = SelectObject(&m_bitmap);
	::ReleaseDC(GetDesktopWindow(), pDC->m_hDC);
}

CMemDC::~CMemDC()
{
	SelectObject(m_pOldBitmap);
	m_bitmap.DeleteObject();
	DeleteDC();
}
HBITMAP CMemDC::CloseMemDC()
{
	SelectObject(m_pOldBitmap);
	return (HBITMAP)(m_bitmap.Detach());
}

现在想把后面的MemDC类整合到第一个memdc.h中，怎么处理？谢谢！

[Eleven]

class CMemDC : public CDC
{
public:
   CMemDC(UINT heigh,UINT width)
   {
      CDC *pDC = CDC::FromHandle(::GetDC(GetDesktopWindow()));
    ASSERT(pDC != NULL);
    CreateCompatibleDC(pDC);
    m_bmpWidth = width;
    m_bmpHeigh = heigh;
    m_bitmap.CreateCompatibleBitmap(pDC, m_bmpWidth, m_bmpHeigh);
    m_pOldBitmap = SelectObject(&m_bitmap);
    ::ReleaseDC(GetDesktopWindow(), pDC->m_hDC);
   m_nIndex = 1;
    }
    // constructor sets up the memory DC
    CMemDC(CDC* pDC) : CDC()
    {
        ASSERT(pDC != NULL);
 
        m_pDC = pDC;
        m_pOldBitmap = NULL;
        m_bMemDC = !pDC->IsPrinting();
               
        if (m_bMemDC)    // Create a Memory DC
        {
            pDC->GetClipBox(&m_rect);
            CreateCompatibleDC(pDC);
            m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
            m_pOldBitmap = SelectObject(&m_bitmap);
            SetWindowOrg(m_rect.left, m_rect.top);
        }
        else        // Make a copy of the relevent parts of the current DC for printing
        {
            m_bPrinting = pDC->m_bPrinting;
            m_hDC       = pDC->m_hDC;
            m_hAttribDC = pDC->m_hAttribDC;
        }
      m_nIndex = 0;
    }
     
    // Destructor copies the contents of the mem DC to the original DC
    ~CMemDC()
    {
   if(1==m_nIndex)
{
SelectObject(m_pOldBitmap);
    m_bitmap.DeleteObject();
    DeleteDC();
}
else{
        if (m_bMemDC) 
        {    
            // Copy the offscreen bitmap onto the screen.
            m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
                          this, m_rect.left, m_rect.top, SRCCOPY);
 
            //Swap back the original bitmap.
            SelectObject(m_pOldBitmap);
        } else {
            // All we need to do is replace the DC with an illegal value,
            // this keeps us from accidently deleting the handles associated with
            // the CDC that was passed to the constructor.
            m_hDC = m_hAttribDC = NULL;
        }
}
    }
 
    // Allow usage as a pointer
    CMemDC* operator->() {return this;}
         
    // Allow usage as a pointer
    operator CMemDC*() {return this;}
    HBITMAP CMemDC::CloseMemDC()
{
    SelectObject(m_pOldBitmap);
    return (HBITMAP)(m_bitmap.Detach());
}
private:
    CBitmap  m_bitmap;      // Offscreen bitmap
    CBitmap* m_pOldBitmap;  // bitmap originally found in CMemDC
    CDC*     m_pDC;         // Saves CDC passed in constructor
    CRect    m_rect;        // Rectangle of drawing area.
    BOOL     m_bMemDC;      // TRUE if CDC really is a Memory DC.
      UINT m_bmpHeigh;
    UINT m_bmpWidth;
     Int m_nIndex;
};