320 lines
11 KiB
C
320 lines
11 KiB
C
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//+-------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 2000 - 2000
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//
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// File: comobjects.h
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//
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// Contents: Base code for com objects exported by Object Model.
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//
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// Classes: CMMCStrongReferences, CMMCIDispatchImpl
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//
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// History: 16-May-2000 AudriusZ Created
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//
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//--------------------------------------------------------------------
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#pragma once
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#ifndef COMOBJECTS_H_INCLUDED
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#define COMOBJECTS_H_INCLUDED
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/*+-------------------------------------------------------------------------*
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* class CComObjectObserver
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*
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* PURPOSE: The general interface for a class that observes com object events
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*
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* USAGE: Used by CMMCIDispatchImpl, so all ObjectModel objects inherit from it
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*
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*+-------------------------------------------------------------------------*/
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class CComObjectObserver : public CObserverBase
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{
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public:
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// request to break external references
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virtual SC ScOnDisconnectObjects() {DEFAULT_OBSERVER_METHOD;}
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};
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/*+-------------------------------------------------------------------------*
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* function GetComObjectEventSource
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*
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* PURPOSE: returns singleton for emmiting Com Object Events
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* Since ObjectModel com objects are implemented in EXE and DLL's
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* There is a need to have 'global' object per process to
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* be able to bradcast events to every object.
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*
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* USAGE: Used by
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* 1) CMMCIDispatchImpl to register objects
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* 2) CAMCMultiDocTemplate to bradcast 'cut off extenal references'
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*+-------------------------------------------------------------------------*/
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MMCBASE_API CEventSource<CComObjectObserver>& GetComObjectEventSource();
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/***************************************************************************\
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*
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* CLASS: CMMCStrongReferences
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*
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* PURPOSE: Implements static interface to count strong references put on MMC
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* Also implements the method to detect when the last stron reference was
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* released in order to start MMC exit procedure.
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*
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* Class is implemented as singleton object in mmcbase.dll
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*
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* USAGE: use CMMCStrongReferences::AddRef() and CMMCStrongReferences::Release()
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* to put/remove strong references on MMC.EXE
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* use CMMCStrongReferences::LastRefReleased() to inspect if the
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* last ref was released
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*
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\***************************************************************************/
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class MMCBASE_API CMMCStrongReferences
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{
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public:
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// public (static) interface
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static DWORD AddRef();
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static DWORD Release();
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static bool LastRefReleased();
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private:
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// implementation helpers
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CMMCStrongReferences();
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static CMMCStrongReferences& GetSingletonObject();
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DWORD InternalAddRef();
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DWORD InternalRelease();
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bool InternalLastRefReleased();
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// data members
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DWORD m_dwStrongRefs; // strong reference count
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bool m_bLastRefReleased; // have strong reference count ever go from one to zero
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};
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/***************************************************************************\
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*
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* CLASS: CMMCIDispatchImpl<typename _ComInterface, const GUID * _pguidClass = &GUID_NULL, const GUID* _pLibID = &LIBID_MMC20>
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* _ComInterface - Object Model interface implemented by the class
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* _pguidClass [optional] - pointer to CLSID for cocreatable objects
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* _pLibID [optional] - pointer to LIBID with _ComInterface's type info
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*
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* PURPOSE: Base for every com object defined by the MMC Object Model
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* implements common functionality, like:
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* - IDispatch
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* - ISupportErrorInfo
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* - IExternalConnection
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*
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* USAGE: Derive your object from CMMCIDispatchImpl<interface>
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* Define: BEGIN_MMC_COM_MAP(_Class) ... END_MMC_COM_MAP() in the class
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* Define COM_INTERFACE_ENTRY for each additional interface
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* ( DO NOT need to add IDispatch, ISupportErrorInfo, IExternalConnection
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* or implemented ObjecModel interface - these are added by the base class )
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*
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\***************************************************************************/
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template<
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typename _ComInterface,
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const GUID * _pguidClass = &GUID_NULL,
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const GUID * _pLibID = &LIBID_MMC20>
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class CMMCIDispatchImpl :
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public IDispatchImpl<_ComInterface, &__uuidof(_ComInterface), _pLibID>,
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// we can use the IMMCSupportErrorInfoImpl object because exactly one dispinterface is exposed from this object.
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public IMMCSupportErrorInfoImpl<&__uuidof(_ComInterface), _pguidClass>,
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public IExternalConnection,
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public CComObjectRoot,
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public CComObjectObserver
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{
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public:
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// typedef interface and this class [used by macros defined in the derived class]
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typedef _ComInterface MMCInterface;
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typedef CMMCIDispatchImpl<_ComInterface, _pguidClass, _pLibID> CMMCIDispatchImplClass;
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// interfaces implemented by this base class
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BEGIN_COM_MAP(CMMCIDispatchImplClass)
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COM_INTERFACE_ENTRY(IDispatch)
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COM_INTERFACE_ENTRY(ISupportErrorInfo)
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COM_INTERFACE_ENTRY(IExternalConnection)
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END_COM_MAP()
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CMMCIDispatchImpl()
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{
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// add itself as an observer for com object events
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GetComObjectEventSource().AddObserver(*static_cast<CComObjectObserver*>(this));
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#ifdef _MMC_NODE_MANAGER_ONLY_
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// Every object implemented by node manager should also register for typeinfo clenup
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static CMMCTypeInfoHolderWrapper wrapper(GetInfoHolder());
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#endif // _MMC_NODE_MANAGER_ONLY_
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}
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#ifdef _MMC_NODE_MANAGER_ONLY_
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// Every object implemented by node manager should also register for typeinfo clenup
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// the porpose of this static function is to ensure _tih is a static variable,
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// since static wrapper will hold on its address - it must be always valid
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static CComTypeInfoHolder& GetInfoHolder() { return _tih; }
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#endif // _MMC_NODE_MANAGER_ONLY_
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// implementation for IExternalConnection methods
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STDMETHOD_(DWORD, AddConnection)(DWORD extconn, DWORD dwreserved)
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{
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DWORD dwRefs = AddRef(); // addref itself
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// put a strong reference on MMC - this will prevent mmc from exiting
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if (extconn & EXTCONN_STRONG)
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dwRefs = CMMCStrongReferences::AddRef();
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return dwRefs;
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}
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STDMETHOD_(DWORD, ReleaseConnection)(DWORD extconn, DWORD dwreserved, BOOL fLastReleaseCloses)
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{
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DWORD dwStrongRefs = 0;
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DWORD dwRefs = 0;
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// release a strong reference on MMC
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if (extconn & EXTCONN_STRONG)
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{
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dwStrongRefs = CMMCStrongReferences::Release();
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}
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//release a ref on itself
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dwRefs = Release();
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// return a proper ref count
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return (extconn & EXTCONN_STRONG) ? dwStrongRefs : dwRefs;
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}
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/***************************************************************************\
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*
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* METHOD: ScOnDisconnectObjects
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*
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* PURPOSE: invoked when observed event (request to disconnect) occures
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* Disconnects from external connections
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*
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* PARAMETERS:
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*
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* RETURNS:
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* SC - result code
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*
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\***************************************************************************/
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virtual ::SC ScOnDisconnectObjects()
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{
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DECLARE_SC(sc, TEXT("CMMCIDispatchImpl<_ComInterface>::ScOnDisconnectObjects"));
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// QI for IUnknown
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IUnknownPtr spUnknown = this;
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// sanity check
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sc = ScCheckPointers( spUnknown, E_UNEXPECTED );
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if (sc)
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return sc;
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// cutt own references
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sc = CoDisconnectObject( spUnknown, 0/*dwReserved*/ );
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if (sc)
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return sc;
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return sc;
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}
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#ifdef DBG
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// this block is to catch mistakes when the Derived class does not use
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// BEGIN_MMC_COM_MAP() or END_MMC_COM_MAP() in its body
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virtual void _BEGIN_MMC_COM_MAP() = 0;
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virtual void _END_MMC_COM_MAP() = 0;
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#endif
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};
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/***************************************************************************\
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*
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* MACRO: BEGIN_MMC_COM_MAP
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*
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* PURPOSE: To be used in place of BEGIN_MMC_COM_MAP for com objects used in MMC Object Model
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*
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\***************************************************************************/
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#ifndef DBG
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// standard version
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#define BEGIN_MMC_COM_MAP(_Class) \
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BEGIN_COM_MAP(_Class) \
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COM_INTERFACE_ENTRY(MMCInterface)
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#else // DBG
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// same as above, but shuts off the trap placed in CMMCIDispatchImpl in debug mode
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#define BEGIN_MMC_COM_MAP(_Class) \
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virtual void _BEGIN_MMC_COM_MAP() {} \
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BEGIN_COM_MAP(_Class) \
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COM_INTERFACE_ENTRY(MMCInterface)
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#endif // DBG
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/***************************************************************************\
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*
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* MACRO: END_MMC_COM_MAP
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*
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* PURPOSE: To be used in place of END_COM_MAP for com objects used in MMC Object Model
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*
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\***************************************************************************/
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#ifndef DBG
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// standard version
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#define END_MMC_COM_MAP() \
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COM_INTERFACE_ENTRY_CHAIN(CMMCIDispatchImplClass) \
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END_COM_MAP()
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#else // DBG
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// same as above, but shuts off the trap placed in CMMCIDispatchImpl in debug mode
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#define END_MMC_COM_MAP() \
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COM_INTERFACE_ENTRY_CHAIN(CMMCIDispatchImplClass) \
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END_COM_MAP() \
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virtual void _END_MMC_COM_MAP() {}
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#endif // DBG
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/*+-------------------------------------------------------------------------*
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* class CConsoleEventDispatcher
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*
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*
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* PURPOSE: Interface for emitting com events from node manager side
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* implemented by CMMCApplication
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*
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*+-------------------------------------------------------------------------*/
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class CConsoleEventDispatcher
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{
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public:
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virtual SC ScOnContextMenuExecuted( PMENUITEM pMenuItem ) = 0;
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};
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/***************************************************************************\
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*
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* METHOD: CConsoleEventDispatcherProvider
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*
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* PURPOSE: this class is to wrap and maintain a pointer to CConsoleEventDispatcher
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* interface. Pointer is set by conui side and used from node manager side.
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* Pointer is discarded when when cleanup event is observed.
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*
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\***************************************************************************/
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class CConsoleEventDispatcherProvider
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{
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public:
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// public class members (static) to get/set interface pointer
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static SC MMCBASE_API ScSetConsoleEventDispatcher( CConsoleEventDispatcher *pDispatcher )
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{
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s_pDispatcher = pDispatcher;
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return SC(S_OK);
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}
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static SC MMCBASE_API ScGetConsoleEventDispatcher( CConsoleEventDispatcher *&pDispatcher )
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{
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pDispatcher = s_pDispatcher;
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return SC(S_OK);
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}
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private:
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// pointer to interface
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static MMCBASE_API CConsoleEventDispatcher *s_pDispatcher;
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};
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#endif // COMOBJECTS_H_INCLUDED
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