How to get device context in Direct3D10
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Could anyone please help me to port this DX9 code to DX10 (not 11!). It is a simple drawing to texture.

        // create the texture
        m_pDevice->CreateTexture(m_width, m_height, 1, 0, D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &m_pTexture, NULL);
        // get its surface (target surface)
        m_pTexture->GetSurfaceLevel(0, &m_pSurface);
        // create the second surface (source surface)
        m_pDevice->CreateOffscreenPlainSurface(m_width, m_height, D3DFMT_X8R8G8B8, D3DPOOL_SYSTEMMEM, &m_pSurfaceMem, NULL);

        // drawing to Direct3D, this is called in loop
        ...
        m_pSurfaceMem->GetDC(&hdc);
        
        HRGN hrgn = CreateRectRgnIndirect(lprc);
        SelectClipRgn(hdc, hrgn);
        RECTL clipRect = { 0, 0, m_width, m_height };
        
        // This draws to the source surface
        m_pViewObject->Draw(DVASPECT_TRANSPARENT, 1, NULL, NULL, NULL, hdc, &clipRect, &clipRect, NULL, 0);
        
        m_pSurfaceMem->ReleaseDC(hdc);
        DeleteObject(hrgn);
        
        POINT pt = {lprc->left, lprc->top};
        // Now update the target surface
        m_pDevice->UpdateSurface(m_pSurfaceMem, lprc, m_pSurface, &pt);

Error handling and the likes can be omitted for simplicity.