Frame extraction from Video in Windows Phone 8.1 C# App Part ||

C++ project of Part I. Frankly speaking this is my first c++ project, I may have made terrible mistakes in it, but best part is, its working. So anyone have any suggestion to improve it please comment.

I modified this Media Playback sample, It plays video using a timer, so I removed swapchaining and created a ID3D11Texture2D and transferred video frame using TransferVideoFrame in Ontimer function.

 ComPtr<ID3D11Texture2D> spTextureDst;  
                MEDIA::ThrowIfFailed(  
                     m_d3dDevice->CreateTexture2D(  
                     &CD3D11_TEXTURE2D_DESC(  
                     DXGI_FORMAT_B8G8R8A8_UNORM,  
                     m_rcTarget.right,    // Width  
                     m_rcTarget.bottom,    // Height  
                     1,     // MipLevels  
                     1,     // ArraySize  
                     D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET  
                     ),  
                     nullptr,  
                     &spTextureDst  
                     )  
                     );  
                if (FAILED(  
                     m_spMediaEngine->TransferVideoFrame(spTextureDst.Get(), nullptr, &m_rcTarget, &m_bkgColor)  
                     ))  
                {  
                     return;  
                }  

then I moved the video to next position and finally generated a bitmap from dxgiSurface

 ComPtr<IDXGISurface2> surface;  
                MEDIA::ThrowIfFailed(  
                     spTextureDst.Get()->QueryInterface(  
                     __uuidof(IDXGISurface2), &surface)  
                     );  
                D2D1_BITMAP_PROPERTIES1 bitmapProperties =  
                     D2D1::BitmapProperties1(  
                     D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW,  
                     D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED),  
                     96,  
                     96  
                     );  
                m_d2dContext->CreateBitmapFromDxgiSurface(surface.Get(), &bitmapProperties, &bitmap);  

In this I have following issues which I think someone could suggest something:

1) Is this the right and only way of extracting frames ?
2) How can i pass bitmap to c# project directly instead of storing them on file?
3) When the events are raised, they are raised from different thread, so c# project need to use dispatcher.invoke to execute anything, what is the solution for this ?