C / C++ / MFC

MyViewClass::OnTimer(UINT nIDEvent)
{
	if(nIDEvent == m_AnimTimerId)		
	{
		if(BmpId == IDB_ASTLEFT + 4)
			BmpId = IDB_ASTLEFT;

		CStatic *pTargetCtrl = (CStatic *) GetDlgItem(IDC_ERR_STATIC);
		ASSERT(pTargetCtrl != NULL);

		m_CurrentBmp.Detach();
		m_CurrentBmp.LoadBitmap(BmpId);
		pTargetCtrl->SetBitmap(m_CurrentBmp);

                BmpId++;
        }
}

void CStatsView::InitialDraw()
{
	pTheDC = GetDC();

	// create memory DCs and select animation bitmaps into them for blitting in the timer event
	// for updating the animation. This is done here so that bitmaps are loaded once and only once
	// and they are selected into the memory DCs once also.
	CBitmap			bmp1, bmp2, bmp3, bmp4;		// first, create 4 bitmap objects

	bmp1.LoadBitmap(IDB_ASTLEFT);
	bmp2.LoadBitmap(IDB_ASTLEFT+1);
	bmp3.LoadBitmap(IDB_ASTLEFT+2);
	bmp4.LoadBitmap(IDB_ASTLEFT+4);

	// create compatible memory dcs - compatible with the display
	dcMem1.CreateCompatibleDC(pTheDC);
	dcMem2.CreateCompatibleDC(pTheDC);
	dcMem3.CreateCompatibleDC(pTheDC);
	dcMem4.CreateCompatibleDC(pTheDC);

	// select bitmaps into their respective memory dc
	dcMem1.SelectObject(&bmp1);
	dcMem2.SelectObject(&bmp2);
	dcMem3.SelectObject(&bmp3);
	dcMem4.SelectObject(&bmp4);

}

if(BmpId == IDB_ASTLEFT + 4)
    BmpId = IDB_ASTLEFT;
switch(BmpId)
{
    case IDB_ASTLEFT :
        pTheDC->BitBlt(0, 0, 7, 7, &dcMem1, 0, 0, SRCCOPY);
    break;
    case IDB_ASTLEFT + 1 :
            pTheDC->BitBlt(0, 0, 7, 7, &dcMem2, 0, 0, SRCCOPY);
    break;
    case IDB_ASTLEFT + 2 :
        pTheDC->BitBlt(0, 0, 7, 7, &dcMem3, 0, 0, SRCCOPY);
    break;
    case IDB_ASTLEFT + 3 :
        pTheDC->BitBlt(0, 0, 7, 7, &dcMem4, 0, 0, SRCCOPY);
    break;
}

BmpId++;