There are many places where ATL’s COM_MAP macros are documented, but I haven’t seen it plainly stated what they actually mean. Simply put, BEGIN_COM_MAP implements _InternalQueryInterface. COM_INTERFACE_ENTRY indicates that your class supports the specified interface. END_COM_MAP finishes the _InternalQueryInterface implementation. … Continue reading What Exactly Are ATL’s BEGIN_COM_MAP, END_COM_MAP, and COM_INTERFACE_ENTRY Macros?
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