How do you capture the active window of a Win32 application using C++ and using DirectX 11?

This is what I use to collect single frames, but if you modify this and keep the two targets open all the time then you could "stream" it to disk using a static counter for the file name. - I can't recall where I found this, but it has been modified, thanks to whoever!

void dump_buffer()

{

   IDirect3DSurface9* pRenderTarget=NULL;

   IDirect3DSurface9* pDestTarget=NULL;

     const char file[] = "Pickture.bmp";

   // sanity checks.

   if (Device == NULL)

      return;

   // get the render target surface.

   HRESULT hr = Device->GetRenderTarget(0, &pRenderTarget);

   // get the current adapter display mode.

   //hr = pDirect3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&d3ddisplaymode);

   // create a destination surface.

   hr = Device->CreateOffscreenPlainSurface(DisplayMde.Width,

                         DisplayMde.Height,

                         DisplayMde.Format,

                         D3DPOOL_SYSTEMMEM,

                         &pDestTarget,

                         NULL);

   //copy the render target to the destination surface.

   hr = Device->GetRenderTargetData(pRenderTarget, pDestTarget);

   //save its contents to a bitmap file.

   hr = D3DXSaveSurfaceToFile(file,

                              D3DXIFF_BMP,

                              pDestTarget,

                              NULL,

                              NULL);

   // clean up.

   pRenderTarget->Release();

   pDestTarget->Release();

}

Thanks..........