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Help!BackBuffer!

Started by knight_xie Apr 19, 2004 at 9:47 PM 0 replies 1k views

Original Post

Apr 19, 2004 at 9:47 PM

HI! I want to save backbuffer to an image ,i try with the code bellow.but it doesn''t work.why? HRESULT hr; RECT SrcRect; D3DLOCKED_RECT d3dlr; g_lpBackBuffer->LockRect(&d3dlr,NULL,NULL); D3DXSaveSurfaceToFile("2.bmp",D3DXIFF_BMP ,g_lpBackBuffer,NULL,NULL); g_lpBackBuffer->UnlockRect();

eFoDay

Apr 19, 2004 at 9:50 PM

you shouldnt need to lock the back buffer
here is the code I use and it seems to work fine


void CDirect3D::TakeScreenShot(LPCTSTR pDestFile)
{
  D3DDISPLAYMODE displayMode;

  LPDIRECT3DSURFACE9 pd3dsFront = NULL;

  // Get the display mode

  m_pd3dDevice->GetDisplayMode(0, &displayMode);

  // Create a surface to hold the front buffer

  m_pd3dDevice->CreateOffscreenPlainSurface(displayMode.Width, displayMode.Height,
    D3DFMT_A8R8G8B8, D3DPOOL_SYSTEMMEM, &pd3dsFront, NULL);

  // Get the front buffer and save it to a file

  if( SUCCEEDED( m_pd3dDevice->GetFrontBufferData(0, pd3dsFront) ) )
    D3DXSaveSurfaceToFile(pDestFile, D3DXIFF_BMP, pd3dsFront, NULL, NULL);

  // Release the surface

  if( pd3dsFront ) pd3dsFront->Release();
}

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