ICLASSF.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:3k
源码类别:
Windows编程
开发平台:
Visual C++
- /*
- * ICLASSF.CPP
- * Patron Chapter 24
- *
- * Implementation of an IClassFactory interface for Patron to
- * enable linking to its embedded objects.
- *
- * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
- *
- * Kraig Brockschmidt, Microsoft
- * Internet : kraigb@microsoft.com
- * Compuserve: >INTERNET:kraigb@microsoft.com
- */
- #include "patron.h"
- /*
- * CLinkClassFactory::CLinkClassFactory
- * CLinkClassFactory::~CLinkClassFactory
- *
- * Constructor Parameters:
- * pFR PCLinkFrame that can create documents.
- */
- CLinkClassFactory::CLinkClassFactory(PCPatronFrame pFR)
- {
- m_cRef=0L;
- m_pFR=pFR;
- return;
- }
- CLinkClassFactory::~CLinkClassFactory(void)
- {
- return;
- }
- /*
- * CLinkClassFactory::QueryInterface
- * CLinkClassFactory::AddRef
- * CLinkClassFactory::Release
- */
- STDMETHODIMP CLinkClassFactory::QueryInterface(REFIID riid
- , PPVOID ppv)
- {
- *ppv=NULL;
- if (IID_IUnknown==riid || IID_IClassFactory==riid)
- *ppv=this;
- if (NULL!=*ppv)
- {
- ((LPUNKNOWN)*ppv)->AddRef();
- return NOERROR;
- }
- return ResultFromScode(E_NOINTERFACE);
- }
- STDMETHODIMP_(ULONG) CLinkClassFactory::AddRef(void)
- {
- return ++m_cRef;
- }
- STDMETHODIMP_(ULONG) CLinkClassFactory::Release(void)
- {
- if (0!=--m_cRef)
- return m_cRef;
- delete this;
- return 0;
- }
- /*
- * CLinkClassFactory::CreateInstance
- *
- * Purpose:
- * Instantiates an object to resolve a link to an embedding.
- */
- STDMETHODIMP CLinkClassFactory::CreateInstance(LPUNKNOWN pUnkOuter
- , REFIID riid, PPVOID ppvObj)
- {
- PCPatronDoc pDoc;
- HRESULT hr;
- *ppvObj=NULL;
- hr=ResultFromScode(E_OUTOFMEMORY);
- //We don't support aggregation
- if (NULL!=pUnkOuter)
- return ResultFromScode(CLASS_E_NOAGGREGATION);
- //Try creating a new document, which creates the object.
- pDoc=(PCPatronDoc)m_pFR->m_pCL->NewDocument(TRUE);
- //ObjectDestroyed has already been called.
- if (NULL==pDoc)
- {
- g_cObj++;
- ObjectDestroyed();
- return hr;
- }
- /*
- * We don't want to do any file initialization here because we
- * want to wait for IPersistFile calls. If we called Load(NULL)
- * we'd create storages and whatnot that we don't want in this
- * case.
- */
- hr=pDoc->QueryInterface(riid, ppvObj);
- if (FAILED(hr))
- {
- m_pFR->m_pCL->CloseDocument(pDoc);
- g_cObj++;
- ObjectDestroyed();
- return hr;
- }
- m_pFR->m_pDocCreated=pDoc;
- return NOERROR;
- }
- /*
- * CLinkClassFactory::LockServer
- *
- * Purpose:
- * Provides control of the application in memory.
- */
- STDMETHODIMP CLinkClassFactory::LockServer(BOOL fLock)
- {
- if (fLock)
- g_cLock++;
- else
- {
- g_cLock--;
- g_cObj++;
- ObjectDestroyed();
- }
- return NOERROR;
- }