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factory.cpp
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1997-08-30
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/*+==========================================================================
File: FACTORY.CPP
Summary: Implementation file for the class factories of the STOSERVE
server. This server provides the DllPaper COM component.
For this component, IClassFactory is implemented in an
appropriate class factory COM object: CFPaper. The COM
component that can be manufactured by this server is known
outside the server by its CLSID: CLSID_DllPaper.
The class factories in this server use the CThreaded
OwnThis mechanism to ensure mutually exclusive access by
contending multiple threads.
For a comprehensive tutorial code tour of this module's
contents and offerings see the tutorial STOSERVE.HTM
file. For more specific technical details on the internal
workings see the comments dispersed throughout the module's
source code.
Classes: CFPaper.
Functions: .
Origin: 6-10-96: atrent - Editor-inheritance from FACTORY.CPP in
the CONSERVE 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.
==========================================================================+*/
/*---------------------------------------------------------------------------
We include WINDOWS.H for all Win32 applications.
We include OLE2.H because we will be calling the COM/OLE Libraries.
We include OLECTL.H because it has definitions for connectable objects.
We include APPUTIL.H because we will be building this DLL using
the convenient Virtual Window and Dialog classes and other
utility functions in the APPUTIL Library (ie, APPUTIL.LIB).
We include IPAPER.H and PAPGUIDS.H for the common Paper-related
Interface class, GUID, and CLSID specifications.
We include SERVER.H because it has the necessary internal class and
resource definitions for this DLL.
We include FACTORY.H because it has the necessary internal class factory
declarations for this DLL component server. Those factories we will be
implementing in this module.
We include CONNECT.H for object class declarations for the various
connection point and connection COM objects used in STOSERVE.
We include PAPER.H, for the object class declarations for the
COPaper COM object.
---------------------------------------------------------------------------*/
#include <windows.h>
#include <ole2.h>
#include <olectl.h>
#include <apputil.h>
#include <ipaper.h>
#include <papguids.h>
#include "server.h"
#include "factory.h"
#include "connect.h"
#include "paper.h"
/*---------------------------------------------------------------------------
Implementation the CFPaper Class Factory. CFPaper is the COM
object class for the Class Factory that can manufacture COPaper
COM Components.
---------------------------------------------------------------------------*/
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CFPaper
Summary: CFPaper Constructor. Note the member initializer:
"m_ImpIClassFactory(this, pUnkOuter, pServer)" which is used
to pass the 'this', pUnkOuter, and pServer pointers of this
constructor function to the constructor executed in the
instantiation of the CImpIClassFactory interface whose
implementation is nested inside this present object class.
Args: IUnknown* pUnkOuter,
Pointer to the the outer Unknown. NULL means this COM Object
is not being Aggregated. Non NULL means it is being created
on behalf of an outside COM object that is reusing it via
aggregation.
CServer* pServer)
Pointer to the server's control object.
Modifies: m_cRefs, m_pUnkOuter.
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
CFPaper::CFPaper(
IUnknown* pUnkOuter,
CServer* pServer) :
m_ImpIClassFactory(this, pUnkOuter, pServer)
{
// Zero the COM object's reference count.
m_cRefs = 0;
// No AddRef necessary if non-NULL, as we're nested.
m_pUnkOuter = pUnkOuter;
// Init the pointer to the server control object.
m_pServer = pServer;
return;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::~CFPaper
Summary: CFPaper Destructor.
Args: void
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
CFPaper::~CFPaper(void)
{
return;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::QueryInterface
Summary: QueryInterface of the CFPaper non-delegating
IUnknown implementation.
Args: REFIID riid,
[in] GUID of the Interface being requested.
PPVOID ppv)
[out] Address of the caller's pointer variable that will
receive the requested interface pointer.
Returns: HRESULT
Standard result code. NOERROR for success.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP CFPaper::QueryInterface(
REFIID riid,
PPVOID ppv)
{
HRESULT hr = E_NOINTERFACE;
if (OwnThis())
{
*ppv = NULL;
if (IID_IUnknown == riid)
*ppv = this;
else if (IID_IClassFactory == riid)
*ppv = &m_ImpIClassFactory;
if (NULL != *ppv)
{
// We've handed out a pointer to the interface so obey the COM rules
// and AddRef the reference count.
((LPUNKNOWN)*ppv)->AddRef();
hr = NOERROR;
}
UnOwnThis();
}
return (hr);
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::AddRef
Summary: AddRef of the CFPaper non-delegating IUnknown implementation.
Args: void
Modifies: m_cRefs.
Returns: ULONG
New value of m_cRefs (COM object's reference count).
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFPaper::AddRef(void)
{
ULONG cRefs;
if (OwnThis())
{
cRefs = ++m_cRefs;
UnOwnThis();
}
return cRefs;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::Release
Summary: Release of the CFPaper non-delegating IUnknown implementation.
Args: void
Modifies: m_cRefs.
Returns: ULONG
New value of m_cRefs (COM object's reference count).
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFPaper::Release(void)
{
ULONG cRefs;
if (OwnThis())
{
cRefs = --m_cRefs;
if (0 == cRefs)
{
// We've reached a zero reference count for this COM object.
// So we tell the server housing to decrement its global object
// count so that the server will be unloaded if appropriate.
if (NULL != m_pServer)
m_pServer->ObjectsDown();
// We artificially bump the main ref count to prevent reentrancy
// via the main object destructor. Not really needed in this
// CFPaper but a good practice because we are aggregatable and
// may at some point in the future add something entertaining like
// some Releases to the CFPaper destructor.
m_cRefs++;
UnOwnThis();
delete this;
}
else
UnOwnThis();
}
return cRefs;
}
/*---------------------------------------------------------------------------
CFPaper's nested implementation of the IClassFactory interface
including Constructor, Destructor, QueryInterface, AddRef, Release,
CreateInstance, and LockServer methods.
---------------------------------------------------------------------------*/
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::CImpIClassFactory
Summary: Constructor for the CImpIClassFactory interface instantiation.
Args: CFPaper* pBackObj,
Back pointer to the parent outer object.
IUnknown* pUnkOuter,
Pointer to the outer Unknown. For delegation.
CServer* pServer)
Pointer to the server's control object.
Modifies: m_pBackObj, m_pUnkOuter, m_pServer.
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
CFPaper::CImpIClassFactory::CImpIClassFactory(
CFPaper* pBackObj,
IUnknown* pUnkOuter,
CServer* pServer)
{
// Init the Back Object Pointer to point to the parent object.
m_pBackObj = pBackObj;
// Init the pointer to the server control object.
m_pServer = pServer;
// Init the CImpIClassFactory interface's delegating Unknown pointer.
// We use the Back Object pointer for IUnknown delegation here if we are
// not being aggregated. If we are being aggregated we use the supplied
// pUnkOuter for IUnknown delegation. In either case the pointer
// assignment requires no AddRef because the CImpIClassFactory lifetime
// is quaranteed by the lifetime of the parent object in which
// CImpIClassFactory is nested.
if (NULL == pUnkOuter)
m_pUnkOuter = pBackObj;
else
m_pUnkOuter = pUnkOuter;
return;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::~CImpIClassFactory
Summary: Destructor for the CImpIClassFactory interface instantiation.
Args: void
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
CFPaper::CImpIClassFactory::~CImpIClassFactory(void)
{
return;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::QueryInterface
Summary: The QueryInterface IUnknown member of this IClassFactory
interface implementation that delegates to m_pUnkOuter,
whatever it is.
Args: REFIID riid,
[in] GUID of the Interface being requested.
PPVOID ppv)
[out] Address of the caller's pointer variable that will
receive the requested interface pointer.
Returns: HRESULT
Standard result code. NOERROR for success.
Returned by the delegated outer QueryInterface call.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP CFPaper::CImpIClassFactory::QueryInterface(
REFIID riid,
PPVOID ppv)
{
// Delegate this call to the outer object's QueryInterface.
return m_pUnkOuter->QueryInterface(riid, ppv);
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::AddRef
Summary: The AddRef IUnknown member of this IClassFactory interface
implementation that delegates to m_pUnkOuter, whatever it is.
Args: void
Returns: ULONG
Returned by the delegated outer AddRef call.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFPaper::CImpIClassFactory::AddRef(void)
{
// Delegate this call to the outer object's AddRef.
return m_pUnkOuter->AddRef();
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::Release
Summary: The Release IUnknown member of this IClassFactory interface
implementation that delegates to m_pUnkOuter, whatever it is.
Args: void
Returns: ULONG
Returned by the delegated outer Release call.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFPaper::CImpIClassFactory::Release(void)
{
// Delegate this call to the outer object's Release.
return m_pUnkOuter->Release();
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::CreateInstance
Summary: The CreateInstance member method of this IClassFactory
interface implementation. Creates an instance of the COPaper
COM component.
Args: IUnknown* pUnkOuter,
[in] Pointer to the controlling IUnknown.
REFIID riid,
[in] GUID of the Interface being requested.
PPVOID ppvCob)
[out] Address of the caller's pointer variable that will
receive the requested interface pointer.
Returns: HRESULT
Standard result code. NOERROR for success.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP CFPaper::CImpIClassFactory::CreateInstance(
IUnknown* pUnkOuter,
REFIID riid,
PPVOID ppv)
{
HRESULT hr = E_FAIL;
COPaper* pCob = NULL;
// NULL the output pointer.
*ppv = NULL;
// If the creation call is requesting aggregation (pUnkOuter != NULL),
// the COM rules state the IUnknown interface MUST also be concomitantly
// be requested. If it is not so requested (riid != IID_IUnknown) then
// an error must be returned indicating that no aggregate creation of
// the CFPaper COM Object can be performed.
if (NULL != pUnkOuter && riid != IID_IUnknown)
hr = CLASS_E_NOAGGREGATION;
else
{
// Instantiate a COPaper COM Object.
pCob = new COPaper(pUnkOuter, m_pServer);
if (NULL != pCob)
{
// Create and initialize any subordinate objects.
hr = pCob->Init();
if (SUCCEEDED(hr))
{
// We successfully created the new COM object so tell the server
// to increment its global server object count to help ensure
// that the server remains loaded until this partial creation
// of a COM component is completed.
m_pServer->ObjectsUp();
// We QueryInterface this new COM Object not only to deposit the
// main interface pointer to the caller's pointer variable, but to
// also automatically bump the Reference Count on the new COM
// Object after handing out this reference to it.
hr = pCob->QueryInterface(riid, (PPVOID)ppv);
if (FAILED(hr))
{
m_pServer->ObjectsDown();
delete pCob;
}
}
else
delete pCob;
}
else
hr = E_OUTOFMEMORY;
}
return hr;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFPaper::CImpIClassFactory::LockServer
Summary: The LockServer member method of this IClassFactory interface
implementation.
Args: BOOL bLock)
[in] Flag determining whether to Lock or Unlock the server.
Returns: HRESULT
Standard result code. NOERROR for success.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP CFPaper::CImpIClassFactory::LockServer(
BOOL bLock)
{
HRESULT hr = NOERROR;
if (bLock)
m_pServer->Lock();
else
m_pServer->Unlock();
return hr;
}