SelectObject 和 DeleteObject

	m_DC.CreateCompatibleDC(pDC); 

	m_Bmp.CreateCompatibleBitmap(pDC, m_nWidth, m_nHeight);

	m_pOldBmp = m_DC.SelectObject(&m_Bmp);

	m_DC.FillSolidRect(0, 0, m_nWidth, m_nHeight, RGB(255,255,255));

	m_RawImage.Draw(m_DC.m_hDC, 8, 5, m_nWidth-20, m_nHeight-35);

	m_DC.Draw3dRect(5, 2, m_nWidth-10, m_nHeight-4, RGB(190,190,190), RGB(190,190,190));	

	m_DC.SetTextColor(RGB(0,0,255));

	m_DC.SetBkMode(TRANSPARENT);

	LOGFONT logfont;

	memset(&logfont, 0x0, sizeof(logfont));

	logfont.lfHeight = 12;

	logfont.lfWeight = FW_NORMAL;

	logfont.lfCharSet = GB2312_CHARSET;

	wcscpy_s(logfont.lfFaceName, _T("宋体"));	



	CString strPageNum;

	if (m_nPageNum == 0)

	{

		strPageNum = _T("签名");

	}

	else

	{

		strPageNum.Format(_T("第%.2d页"), m_nPageNum);

	}

	CFont font;

	font.CreateFontIndirect(&logfont);

	CFont* poldFont = m_DC.SelectObject(&font);

	m_DC.DrawText(strPageNum, CRect(m_nWidth/2-20, m_nHeight-25, m_nWidth/2+20, m_nHeight-5),  DT_LEFT);

	m_DC.SelectObject(poldFont);

	font.DeleteObject();