C / C++ / MFC

void CFlickerTestDlg::OnPaint()<br />
{<br />
    CPaintDC dc(this); // device context for painting<br />
<br />
    CRect rcClient;		<br />
    GetClientRect(rcClient);	// See Note 1<br />
<br />
    CDC MemDC,*pDC;<br />
    CBitmap MemBitmap;<br />
<br />
    pDC = this->GetDC();         // Get Current DC<br />
    MemDC.CreateCompatibleDC(pDC);<br />
    MemBitmap.CreateCompatibleBitmap(pDC,rcClient.right,rcClient.bottom);<br />
<br />
    CBitmap *pOldBitmap = MemDC.SelectObject(&m_BmpTarget);<br />
    //CBrush bkBrush(HS_FDIAGONAL,RGB(0,rand()%255,0));	// See Note 2<br />
    //MemDC.FillRect(rcClient,&bkBrush);<br />
<br />
    pDC->BitBlt(0,0,rcClient.right,rcClient.bottom,&MemDC,0,0,SRCCOPY);	//See Note 3<br />
    MemDC.SelectObject(pOldBitmap);<br />
}

typedef struct { 
   DWORD dwValue;
   BYTE  bDummy[1020]; 
} CELL, *PCELL;


typedef CELL SPREADSHEET[g_nNumRows][g_nNumCols];
typedef SPREADSHEET *PSPREADSHEET;


CELL* m_pArray = (CELL*) VirtualAlloc(NULL, g_nNumRows * g_nNumCols, 
      MEM_RESERVE | MEM_TOP_DOWN, PAGE_READWRITE);

SPREADSHEET& g_ss = * (PSPREADSHEET) m_pArray ;