双缓冲的住代码段

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//hdc为显示图像窗体的DC
    HDC dc;
    HBITMAP bit;
    int Width = pbi->bmiHeader.biWidth;
    int Height =pbi->bmiHeader.biHeight;

    //创建兼容DC和Bitmap
    dc = ::CreateCompatibleDC(hdc);
    bit = ::CreateCompatibleBitmap(hdc, Width, Height);

    HBITMAP oldBit = (HBITMAP)::SelectObject(dc, bit);

    //在刚创建的dc上显示图像
    ::StretchDIBits(dc, 0,0,Width, Height,0,0,Width, Height,
        pImageBuffer, pbi, DIB_RGB_COLORS,SRCCOPY);

    //调用CDC函数在刚创建的dc上画线或写字等
    HPEN pen = ::CreatePen(PS_SOLID, 1, RGB(240,0,0));
    HPEN oldPen = (HPEN)::SelectObject(hdc, pen);
    POINT dot;

::MoveToEx(dc, 0, K_SIZEY/2, &dot);
::LineTo(dc, K_SIZEX, K_SIZEY/2);

::MoveToEx(dc, K_SIZEX/2,0, &dot);
::LineTo(dc, K_SIZEX/2, K_SIZEY);

    //资源释放
    ::SelectObject(hdc, oldPen);
    ::DeleteObject(pen);

//将已绘制好的dc拷贝到显示窗体上
::StretchBlt(hdc, 0,0,Width, Height, dc, 0, 0, Width, Height,SRCCOPY);

    //////////////////////////////////////////////////////////////////////////
    //资源释放
    SelectObject(dc, oldBit);
    ::DeleteDC(dc);
    ::DeleteObject(bit);