#pragma once
#include <afxwin.h>  // MFC ºËÐÄÍ·Îļþ

// CServoMemDC£ºË«»º³å»æͼ·â×°ÀࣨÏû³ýÉÁ˸£©
class CServoMemDC : public CDC
{
public:
    CServoMemDC(CDC* pDC, const CRect* pRect = nullptr); // ¹¹Ô죺´«ÈëÄ¿±ê DC ºÍÇøÓò
    ~CServoMemDC();                                      // Îö¹¹£º×Ô¶¯¿½±´µ½Ä¿±ê DC

    CServoMemDC* operator->();
    operator CDC* ();

private:
    CBitmap m_bitmap;        // ÓÃÓÚÄÚ´æ DC µÄλͼ
    CBitmap* m_pOldBitmap;   // ¾Éλͼ
    CDC* m_pDC;              // ԭʼ»æͼ DC£¨´°¿Ú£©
    CRect m_rect;            // »æͼÇøÓò
    BOOL m_bMemDC;           // ÊÇ·ñÆôÓÃÁËÄÚ´æ DC£¨CreateCompatibleDC ³É¹¦£©
};