用双缓冲解决闪烁问题

发布: 2007-7-01 20:40 | 作者: admin | 来源: | 查看: 36次 | 进入软件测试论坛讨论

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;
}