memdc.h

来自「evc listcontrol控件自绘,实现report风格的标题自绘,以及滚动」· C头文件 代码 · 共 39 行

#ifndef _MEMDC_H_
#define _MEMDC_H_




class CMemDC : public CDC
{
private:
	CBitmap*	m_bitmap;
	CBitmap*	m_oldBitmap;
	CDC*		m_pDC;
	CRect		m_rcBounds;
public:
	CMemDC(CDC* pDC, const CRect& rcBounds) : CDC()
	{
		CreateCompatibleDC(pDC);
		m_bitmap = new CBitmap;
		m_bitmap->CreateCompatibleBitmap(pDC, rcBounds.Width(), rcBounds.Height());
		m_oldBitmap = SelectObject(m_bitmap);
		m_pDC = pDC;
		m_rcBounds = rcBounds;
	}
	~CMemDC()
	{
		m_pDC->BitBlt(m_rcBounds.left, m_rcBounds.top, m_rcBounds.Width(), m_rcBounds.Height(), this, m_rcBounds.left, m_rcBounds.top, SRCCOPY);
		SelectObject(m_oldBitmap);
		if(m_bitmap != NULL)
			delete m_bitmap;
	}
	CMemDC* operator->()
	{
		return this;
	}
};



#endif