用双缓冲解决闪烁问题

软件类别: 系统编程
软件大小: 280KB
运行环境: windows
软件等级: ★★★
演示:
缩略图:
下载次数: 471

软件介绍

程序代码：

void CLovesisiDlg::OnTimer(UINT nIDEvent)
{
Invalidate();

m_n++;
CString str;
str.Format("第 %d 次刷新",m_n);
this->SetWindowText(str);

CDialog::OnTimer(nIDEvent);
}

void CLovesisiDlg::OnButton1()
{
SetTimer(1,50,NULL);
}

BOOL CLovesisiDlg::OnEraseBkgnd(CDC* pDC)
{
  CRect rect;
  GetWindowRect(&rect);

  CDC MemDC,mdc;
  CBitmap MemBitmap,b1,b2,b3;

  mdc.CreateCompatibleDC(NULL);
  MemDC.CreateCompatibleDC(NULL);

  MemBitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
  CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
  MemDC.FillSolidRect(0,0,rect.Width(),rect.Height(),RGB(0,0,0));
  b1.LoadBitmap(IDB_BITMAP1);
  b2.LoadBitmap(IDB_BITMAP2);
  b3.LoadBitmap(IDB_BITMAP3);
  mdc.SelectObject(&b1);
  MemDC.BitBlt(0,0,366,470,&mdc,0,0,SRCCOPY);
  mdc.SelectObject(&b2);
  MemDC.BitBlt(0,0,366,470,&mdc,0,0,SRCCOPY);
  mdc.SelectObject(&b3);
  MemDC.BitBlt(0,0,366,470,&mdc,0,0,SRCCOPY);

  pDC->BitBlt(0,0,rect.Width(),rect.Height(),&MemDC,0,0,SRCCOPY);
  //绘图完成后的清理
  MemBitmap.DeleteObject();
  MemDC.DeleteDC();

  // return CDialog::OnEraseBkgnd(pDC);
  return true;
}