//old sintax:
IDirect3DDevice9 *g_d3d_device;

IDirect3D9 *g_D3D;

//new sintax:
ATL::CComPtr<IDirect3DDevice9> g_d3d_device;

ATL::CComPtr<IDirect3D9> g_D3D;

//declaration
HRESULT dhInitD3D(IDirect3D9 **p_d3d);
//definition
HRESULT dhInitD3D(IDirect3D9 **p_d3d){
   
   (*p_d3d) = Direct3DCreate9(D3D_SDK_VERSION);
  
   }

   return D3D_OK;
}
// function being called
dhInitD3D(&App1.g_D3D);


//declaration
HRESULT dhInitDevice(IDirect3D9 *p_d3d,IDirect3DDevice9 **p_device);
//definition
HRESULT dhInitDevice(IDirect3D9 *p_d3d,IDirect3DDevice9 **p_device){
HRESULT hr = S_OK;

   hr=p_d3d->CreateDevice(p_adapter,
                        p_dev_type,
                       
                        p_window,

                        D3DCREATE_SOFTWARE_VERTEXPROCESSING,

                        p_pp,
                        
                        p_device);
   

   return hr;
}
// Function being called
hr=dhInitDevice(App1.g_D3D,&App1.g_d3d_device);

HRESULT CreateDevice(  UINT Adapter,  D3DDEVTYPE DeviceType,  HWND hFocusWindow,  DWORD BehaviorFlags,  D3DPRESENT_PARAMETERS * pPresentationParameters,  IDirect3DDevice9 ** ppReturnedDeviceInterface);