笔记 区域

void COpenSaveAcessView::OnLButtonUp(UINT nFlags, CPoint point)
{
 // TODO: Add your message handler code here and/or call default
 CDC* pDC;
 pDC=GetDC();
 COpenSaveAcessDoc* pDoc = GetDocument();
 ASSERT_VALID(pDoc);
 // TODO: add draw code for native data here
 if(pDoc->m_pDib==NULL)
  return;
 BITMAPINFOHEADER *infoHead=(BITMAPINFOHEADER*)pDoc->m_pDib;
 int width=infoHead->biWidth;
 int height=infoHead->biHeight;
 int biBitCount=infoHead->biBitCount;

 int colorTableLng;
 if(biBitCount!=24)//看了书
  colorTableLng=(int)pow(2,biBitCount);
 else
  colorTableLng=0;

 HPALETTE hPalette=0,hOldPal;
 if(colorTableLng!=0){
  RGBQUAD *pColorTable=(RGBQUAD*)(pDoc->m_pDib+sizeof(BITMAPINFOHEADER));
 LPLOGPALETTE lpColorTable=(LPLOGPALETTE)new char[2*sizeof(WORD)+
  sizeof(PALETTEENTRY)*colorTableLng];//RGBQUAD 可以互换PALETTEENTRY
 lpColorTable->palVersion=0x300;
 lpColorTable->palNumEntries=colorTableLng;
 for(int i=0;i<colorTableLng;i++){
  lpColorTable->palPalEntry[i].peBlue=pColorTable[i].rgbBlue;
  lpColorTable->palPalEntry[i].peGreen=pColorTable[i].rgbGreen;
  lpColorTable->palPalEntry[i].peRed=pColorTable[i].rgbRed;
  lpColorTable->palPalEntry[i].peFlags=0;
 }
 
 hPalette=::CreatePalette(lpColorTable);//看了书
 hOldPal=::SelectPalette(pDC->GetSafeHdc(),hPalette,TRUE);
 pDC->RealizePalette();

 delete []lpColorTable;
 }
 pDC->SetStretchBltMode(COLORONCOLOR);
 unsigned char *pImgData=(unsigned char *)(pDoc->m_pDib+
  sizeof(BITMAPINFOHEADER)+
  sizeof(RGBQUAD)*colorTableLng);//看了书
 ::StretchDIBits(pDC->GetSafeHdc(), m_ptOrigin.x, m_ptOrigin.y,
  point.x-m_ptOrigin.x,point.y-m_ptOrigin.y,
     m_ptOrigin.x, m_ptOrigin.y,
  point.x-m_ptOrigin.x,point.y-m_ptOrigin.y,
     pImgData/*注意这里*/,
     (LPBITMAPINFO/*注意这里*/)pDoc->m_pDib,
     DIB_RGB_COLORS,SRCCOPY);
 if(hOldPal!=NULL)
  ::SelectPalette(pDC->GetSafeHdc(),hOldPal,TRUE);

 CView::OnLButtonUp(nFlags, point);
}