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factory.h
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1997-08-05
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/*+==========================================================================
File: FACTORY.H
Summary: Include file for the class factory COM object: CFTextPage.
This constitutes the PERTEXT server's class factory for the
TextPage COM component.
The multiple interface COM Object Class is achieved via the
technique of nested classes: the implementation of the
standard IClassFactory interface is nested inside of the
class factory COM object class. APPUTIL's CThreaded OwnThis
mechanism is used to ensure mutually exclusive access to the
class factory by contending multiple threads.
For a comprehensive tutorial code tour of this module's
contents and offerings see the tutorial PERTEXT.HTM
file. For more specific technical details on the internal
workings see the comments dispersed throughout the module's
source code.
Classes: CFTextPage.
Functions: .
Origin: 5-20-97: atrent - Editor-inheritance from FACTORY.H in
the STOSERVE Tutorial Code Sample.
----------------------------------------------------------------------------
This file is part of the Microsoft COM Tutorial Code Samples.
Copyright (C) Microsoft Corporation, 1997. All rights reserved.
This source code is intended only as a supplement to Microsoft
Development Tools and/or on-line documentation. See these other
materials for detailed information regarding Microsoft code samples.
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
==========================================================================+*/
#if !defined(FACTORY_H)
#define FACTORY_H
#ifdef __cplusplus
/*O+O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O
ObjectClass: CFTextPage
Summary: Class Factory COM Object Class for TextPage COM components.
Used to manufacture COTextPage COM objects. The mulitple
interfaces on this COM object class are constructed via the
nested interface classes technique.
Interfaces: IUnknown
Standard interface providing COM object features.
IClassFactory
Standard interface providing COM Class Factory features.
Aggregation: Yes, CFTextPage COM objects are aggregatable by
passing a non-NULL pUnkOuter IUnknown pointer into the
constructor.
O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O-O*/
class CFTextPage : public IUnknown, public CThreaded
{
public:
// Main Object Constructor & Destructor.
CFTextPage(IUnknown* pUnkOuter, CServer* pServer);
~CFTextPage(void);
// IUnknown methods. Main object, non-delegating.
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
// We declare nested class interface implementations here.
// We implement the IClassFactory interface in this class
// factory COM object class. Derive also from abstract CThreaded
// to provide the OwnThis/UnownThis thread-safety mechanism.
class CImpIClassFactory : public IClassFactory, public CThreaded
{
public:
// Interface Implementation Constructor & Destructor.
CImpIClassFactory(
CFTextPage* pCO,
IUnknown* pUnkOuter,
CServer* pServer);
~CImpIClassFactory(void);
// IUnknown methods.
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
// IClassFactory methods.
STDMETHODIMP CreateInstance(IUnknown*, REFIID, PPVOID);
STDMETHODIMP LockServer(BOOL);
private:
// Data private to this interface implementation of IClassFactory.
CFTextPage* m_pCO; // Parent Object back pointer.
IUnknown* m_pUnkOuter; // Outer unknown for Delegation.
CServer* m_pServer; // Server's control object.
};
// Make the otherwise private and nested IClassFactory interface
// implementation a friend to COM object instantiations of this
// CFTextPage COM object class.
friend CImpIClassFactory;
private:
// Private data of CFTextPage COM objects.
// Nested IClassFactory implementation instantiation.
CImpIClassFactory m_ImpIClassFactory;
// Main Object reference count.
ULONG m_cRefs;
// Outer unknown (aggregation & delegation). Used when this
// CFTextPage object is being aggregated. Otherwise it is used
// for delegation if this object is reused via containment.
IUnknown* m_pUnkOuter;
// Pointer to this component server's control object.
CServer* m_pServer;
};
#endif // __cplusplus
#endif // FACTORY_H