?? memdc.h
字號:
#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
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