ATL COM Map

The ATL COM MAP is a (mostly) generated list of macros the AppWizard decorates the COM class with.

BEGIN_COM_MAP(CExample)
   COM_INTERFACE_ENTRY(IExample)
   COM_INTERFACE_ENTRY_IID(IID_IDispatch, CExampleDispatch)
   COM_INTERFACE_ENTRY(IExampleBase)
   COM_INTERFACE_ENTRY(ISupportErrorInfo)
END_COM_MAP()

There a many variations of the COM_INTERFACE_ENTRY macro, see below. Occasionally you have to change one so you have to understand it.

References

• COM Interface Entry Macros | Microsoft Learn