instantiating a SpriteBatch object when my DeviceContext is a ComPtr

Question

This question has to do with the DirecXTK library that Chuck Walbourn & Shawn Hargreaves put together. I'm using c++,  VS11 Ultimate beta, and win 8 CP to make a metro app.

The SpriteBatch takes a pointer to the deviceContext as an argument in the constructor:

explicit SpriteBatch(_In_ ID3D11DeviceContext* deviceContext);

However, using the Direct3DApplication starter project, it creates the ID3D11deviceContext using a ComPtr:

Microsoft::WRL::ComPtr<ID3D11DeviceContext>    m_d3dContext;

So when I try the line from Shawn's Blog,:

std::unique_ptr<SpriteBatch> spriteBatch(new SpriteBatch(m_d3dContext));

I get a red squiggly under the 'left paren' between the words SpiteBatch & the m_d3dContext. The compile error says this:

cannot convert parameter 1 from 'Microsoft::WRL::ComPtr<T>' to 'ID3D11DeviceContext *'

I'm a little too new at c++ and pointers to know how to resolve this, but I bet there's an easy answer. How would I go about converting the pointers to give the SpriteBatch constructor what it wants?

Thank you.

Answer 1

hi, you need the underlying interface pointer

m_d3dContex.Get( );

Answer 2

Thank you so much. That worked.