Experiment using a built interface for Office

Building office headers
Using visual studio 2015
- Create a new C++ console application, no precompiled headers
- add the following to the top of the file:

 #import "C:\Program Files (x86)\Common Files\Microsoft Shared\OFFICE15\MSO.DLL"
 #import "C:\Program Files (x86)\Common Files\Microsoft Shared\VBA\VBA6\VBE6EXT.OLB"
 #import "C:\Program Files (x86)\Microsoft Office\Office15\MSWORD.OLB"  \
   auto_rename, \
   raw_native_types, \
   rename("ExitWindows","MsoExitWindows"), \
   rename("FindText","MsoFindText"), \
   named_guids

See https://msdn.microsoft.com/en-us/library/298h7faa.aspx for these
attributes. Or search for "MSVC #import Attributes"
The attributes we use:
- auto_rename - Renames C++ reserved words by appending two underscores
  (__) to the variable name to resolve potential name conflicts.
- raw_native_types - Disables the use of COM support classes in the
  high-level wrapper functions and forces the use of low-level data
  types instead. To be compatible with existing code we want to use
  BSTR rather than _bstr_t
- named_guids - Tells the compiler to define and initialize GUID
  variables in old style, of the form LIBID_MyLib, CLSID_MyCoClass,
  IID_MyInterface, and DIID_MyDispInterface.

The files created:
- have wrapped functions that emit C++ exceptions in the style:
  - long MoveEnd (
  - VARIANT * Unit = &vtMissing,
  - VARIANT * Count = &vtMissing );
  - and have unwrapped functions (no impl) that do not emit
    exceptions in the style:
      virtual HRESULT __stdcall raw_MoveEnd (
      /*[in]*/ VARIANT * Unit,
      /*[in]*/ VARIANT * Count,
      /*[out,retval]*/ long * prop ) = 0;

Note use _variant_t instead of VARIANT.