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Associated article: Undocumented Corner

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Published source code accompanying the Undocumented Corner column by Scot Wingo and George Shepherd Understanding how drag-and-drop works at the Common Object Model (COM) level and how MFC implements drag-and-drop illustrates the power of COM, underscoring the kinds of things you can do by programming in COM. 

					_Undocumented Corner_
by George Shepherd and Scot Wingo

Listing One
interface IDataObject : IUnknown {
  virtual   HRESULT  GetData(FORMATETC* pformatetc, STGMEDIUM* pmedium) = 0;
  virtual   HRESULT  GetDataHere(FORMATETC* pformatetc,STGMEDIUM* pmedium) = 0;
  virtual   HRESULT  QueryGetData(FORMATETC* pformatetc) = 0;
  virtual   HRESULT  GetCanonicalFormatEtc(FORMATETC* pformatetcIn, 
                                       FORMATETC* pformatetcOut) = 0;
  virtual   ...
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