void CDrawBase::DrawMain(CDC *pDC, BOOL bSeeMark)

{

	if (bSeeMark && !m_bCanDraw)

		return;



	CMemDC dc(pDC, &((CRect)m_rect));   //Call stack 就到这里，程序出错，请看MemDC的代码：

	dc.SetBkMode(TRANSPARENT);

	DrawBackGround(&dc);

	_DrawMain(&dc);

}

CMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()

{

	ASSERT(pDC != NULL); 



	// Some initialization

	m_pDC = pDC;

	m_oldBitmap = NULL;

	m_bMemDC = !pDC->IsPrinting();

	// Get the rectangle to draw

	if (pRect == NULL) {

		pDC->GetClipBox(&m_rect);

	} else {

		m_rect = *pRect;

	}

		

	if (m_bMemDC) {

		// Create a Memory DC

		CreateCompatibleDC(pDC);

		pDC->LPtoDP(&m_rect);



		m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height()); 

		m_oldBitmap = SelectObject(&m_bitmap);   //好，call stack到这里程序出错 

			

		SetMapMode(pDC->GetMapMode());

		pDC->DPtoLP(&m_rect);

		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;

	}



	// Fill background 

	FillSolidRect(m_rect, pDC->GetBkColor());

}

ASSERT_VALID(pDC);