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POUnable to capture data from Back Buffer (DirectX9)
 

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    <p>I am trying to find the fastest method to take the screenshot. So far I've figured out that either GDI, or DirectX can be used. Using GDI I am able to capture the screen in 35ms, while using DirectX Front buffer it takes 73ms average. I want even faster method than this. For this purpose capturing Back Buffer in DirectX seems to be a good method. I am using the following code to do the same:</p> <pre><code> D3DDISPLAYMODE ddm; D3DPRESENT_PARAMETERS d3dpp; if((g_pD3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL) { ErrorMessage("Unable to Create Direct3D "); return E_FAIL; } if(FAILED(g_pD3D-&gt;GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&amp;ddm))) { ErrorMessage("Unable to Get Adapter Display Mode"); return E_FAIL; } ZeroMemory(&amp;d3dpp,sizeof(D3DPRESENT_PARAMETERS)); d3dpp.Windowed=WINDOW_MODE; d3dpp.Flags=D3DPRESENTFLAG_LOCKABLE_BACKBUFFER; d3dpp.BackBufferFormat=ddm.Format; d3dpp.BackBufferHeight=nDisplayHeight=gScreenRect.bottom =ddm.Height; d3dpp.BackBufferWidth=nDisplayWidth=gScreenRect.right =ddm.Width; d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE; // d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD; d3dpp.SwapEffect=D3DSWAPEFFECT_COPY; d3dpp.hDeviceWindow=hWnd; d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT; d3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT; if(FAILED(g_pD3D-&gt;CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&amp;d3dpp,&amp;g_pd3dDevice))) { ErrorMessage("Unable to Create Device"); return E_FAIL; } if(FAILED(g_pd3dDevice-&gt;CreateOffscreenPlainSurface(ddm.Width, ddm.Height, D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &amp;g_pSurface, NULL))) { ErrorMessage("Unable to Create Surface"); return E_FAIL; } g_pd3dDevice-&gt;GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&amp;g_pSurface); D3DXSaveSurfaceToFile("d:\\v\\temp.bmp",D3DXIFF_BMP,g_pSurface,NULL,NULL); </code></pre> <p>The problem is, that the output file measures 5MB, but shows nothing but black color in the output. While in the same code if I use GetFrontBufferData I can successfully capture the screen. Am I doing anything wrong? Please help me.. </p>
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    1. USEisen Jack
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    1. CODid you check: http://stackoverflow.com/questions/12879880/how-to-get-the-screenshot-of-the-desktop-from-back-buffer-with-directx
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      1. USmots_g
    2. COUnless I'm missing something you are not actually drawing anything so you have nothing to capture.
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      1. USSebastian Cabot
    3. CO@mots: Yeah I have. I am trying that too, given that the author couldn't get it to work.
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