Implement the Custom ISink Interface Methods

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Implement the Custom ISink Interface Methods

To make registering the event sink easy for administrators, we add two methods to the default ISink interface. These methods are called ISink::RegisterSink and ISink::UnRegisterSink. See the example file Sink.cpp for the implementations. Here are the IDL definitions:

interface ISink : IDispatch
{
 [id(1), HRESULT RegisterSink(
   [in] long lInstance,
   [in] BSTR DisplayName,
   [in] BSTR BindingGUID,
   [in] BSTR ResponseText,
   [in] VARIANT_BOOL fEnabled,
   [out,retval] BSTR* OutBindingGUID
 );
 [id(2), HRESULT UnRegisterSink(
   [in] long lInstance,
   [in] BSTR BindingGUID
  );