FACTORY.CPP
资源名称:MSDN_VC98.zip [点击查看]
上传用户:bangxh
上传日期:2007-01-31
资源大小:42235k
文件大小:16k
源码类别:
Windows编程
开发平台:
Visual C++
- /*+==========================================================================
- File: FACTORY.CPP
- Summary: Implementation file for the class factories of the PERDRAW
- server. This server provides the DrawPage COM component.
- For this component, IClassFactory is implemented in an
- appropriate class factory COM object: CFDrawPage. The COM
- component that can be manufactured by this server is known
- outside the server by its CLSID: CLSID_DrawPage.
- 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 PERDRAW.HTM
- file. For more specific technical details on the internal
- workings see the comments dispersed throughout the module's
- source code.
- Classes: CFDrawPage.
- Functions: .
- Origin: 5-20-97: atrent - Editor-inheritance from FACTORY.CPP 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.
- ==========================================================================+*/
- /*---------------------------------------------------------------------------
- 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 IPAGES.H and PAGEGUID.H for the common DrawPage-related
- Interface class, GUID, and CLSID specifications.
- We include SERVER.H because it has the necessary internal class and
- resource definitions for this DLL and for the server housing.
- We include FACTORY.H because it has the necessary internal class factory
- declarations for this DLL component server. Those are the 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 PERDRAW.
- We include DRAWPAGE.H, for the object class declarations for the
- CODrawPage COM object.
- ---------------------------------------------------------------------------*/
- #include <windows.h>
- #include <ole2.h>
- #include <olectl.h>
- #include <apputil.h>
- #include <ipages.h>
- #include <pageguid.h>
- #include "server.h"
- #include "factory.h"
- #include "connect.h"
- #include "drawpage.h"
- /*---------------------------------------------------------------------------
- Implementation the CFDrawPage Class Factory. CFDrawPage is the COM
- object class for the Class Factory that can manufacture CODrawPage
- COM Components.
- ---------------------------------------------------------------------------*/
- /*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
- Method: CFDrawPage::CFDrawPage
- Summary: CFDrawPage 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*/
- CFDrawPage::CFDrawPage(
- 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: CFDrawPage::~CFDrawPage
- Summary: CFDrawPage 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*/
- CFDrawPage::~CFDrawPage(void)
- {
- return;
- }
- /*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
- Method: CFDrawPage::QueryInterface
- Summary: QueryInterface of the CFDrawPage 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 CFDrawPage::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: CFDrawPage::AddRef
- Summary: AddRef of the CFDrawPage 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) CFDrawPage::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: CFDrawPage::Release
- Summary: Release of the CFDrawPage 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) CFDrawPage::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
- // CFDrawPage but a good practice because we are aggregatable and
- // may at some point in the future add something entertaining like
- // some Releases to the CFDrawPage destructor.
- m_cRefs++;
- UnOwnThis();
- delete this;
- }
- else
- UnOwnThis();
- }
- return cRefs;
- }
- /*---------------------------------------------------------------------------
- CFDrawPage'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: CFDrawPage::CImpIClassFactory::CImpIClassFactory
- Summary: Constructor for the CImpIClassFactory interface instantiation.
- Args: CFDrawPage* pCO,
- 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_pCO, 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*/
- CFDrawPage::CImpIClassFactory::CImpIClassFactory(
- CFDrawPage* pCO,
- IUnknown* pUnkOuter,
- CServer* pServer)
- {
- // Init the main Object Pointer to point to the parent object.
- m_pCO = pCO;
- // Init the pointer to the server control object.
- m_pServer = pServer;
- // Init the CImpIClassFactory interface's delegating Unknown pointer.
- // We use the main 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 = pCO;
- 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: CFDrawPage::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*/
- CFDrawPage::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: CFDrawPage::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 CFDrawPage::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: CFDrawPage::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) CFDrawPage::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: CFDrawPage::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) CFDrawPage::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: CFDrawPage::CImpIClassFactory::CreateInstance
- Summary: The CreateInstance member method of this IClassFactory
- interface implementation. Creates an instance of the CODrawPage
- COM component.
- Args: IUnknown* pUnkOuter,
- [in] Pointer to the controlling IUnknown.
- 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 CFDrawPage::CImpIClassFactory::CreateInstance(
- IUnknown* pUnkOuter,
- REFIID riid,
- PPVOID ppv)
- {
- HRESULT hr = E_FAIL;
- CODrawPage* pCO = 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 CFDrawPage COM Object can be performed.
- if (NULL != pUnkOuter && riid != IID_IUnknown)
- hr = CLASS_E_NOAGGREGATION;
- else
- {
- // Instantiate a CODrawPage COM Object.
- pCO = new CODrawPage(pUnkOuter, m_pServer);
- if (NULL != pCO)
- {
- // Create and initialize any subordinate objects.
- hr = pCO->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 = pCO->QueryInterface(riid, (PPVOID)ppv);
- if (FAILED(hr))
- {
- m_pServer->ObjectsDown();
- delete pCO;
- }
- }
- else
- delete pCO;
- }
- 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: CFDrawPage::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 CFDrawPage::CImpIClassFactory::LockServer(
- BOOL bLock)
- {
- HRESULT hr = NOERROR;
- if (bLock)
- m_pServer->Lock();
- else
- m_pServer->Unlock();
- return hr;
- }