# IOleAdviseHolder::Advise

Establishes an advisory connection between an OLE object and the calling object’s advise sink. Through that sink, the calling object can receive notification when the OLE object is renamed, saved, or closed.

HRESULT Advise(

IAdviseSink * pAdvise, | //Pointer to the advise sink on the calling object
DWORD * pdwConnection | //Pointer to a token
); |

Parameters

pAdvise
  [in] Pointer to the IAdviseSink interface on the advisory sink that should be informed of changes.
pdwConnection
  [out] Pointer to a token that can be passed to the IOleAdviseHolder::Unadvise method to delete the advisory connection. The calling object is responsible for calling both IUnknown::AddRef and IUnknown::Release on this pointer.

Return Values

This method supports the standard return value E_INVALIDARG, as well as the following:

S_OK
  Advisory connections set up successfully.

Remarks

Containers, object handlers, and link objects all create advise sinks to receive notification of changes in compound-document objects of interest, such as embedded or linked objects. OLE objects of interest to these objects must implement the IOleObject interface, which includes several advisory methods, including IOleObject::Advise. A call to this method must set up an advisory connection with any advise sink that calls it, and maintain each connection until it is closed. It must be able to handle more than one advisory connection at a time.

IOleAdviseHolder::Advise is intended to be used to simplify the implementation of IOleObject::Advise. You can get a pointer to the OLE implementation of IOleAdviseHolder by calling CreateOleAdviseHolder, and then, to implement IOleObject::Advise, just delegate the call to IOleAdviseHolder::Advise. Other IOleAdviseHolder methods are intended to implement other IOleObject advisory methods.

If the attempt to establish an advisory connection is successful, the object receiving the call returns a nonzero value through pdwConnection. If the attempt fails, the object returns a zero. To delete an advisory connection, the object with the advise sink passes this nonzero token back to the object by calling IOleAdviseHolder::Unadvise.

See Also

IOleAdviseHolder::UnAdvise, IOleAdviseHolder::EnumAdvise, IOleObject::Advise