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Factory.cpp
资源名称：COM 原理与应用.rar　[点击查看]
上传用户：biuytresa
上传日期：2007-12-07
资源大小：721k
文件大小：3k
源码类别：

DNA

开发平台：

Visual C++

Factory.cpp：源码内容
  1. #include "stdafx.h"
  2. #include "factory.h"
  3. #include "dictionary.h"
  5. extern ULONG    g_LockNumber;
  6. extern ULONG    g_DictionaryNumber;
  7. extern DWORD dwMainThreadID;
  8. extern "C" const GUID CLSID_Dictionary; 
  10. CDictionaryFactory::CDictionaryFactory()
  11. {
  12. m_Ref = 0;
  13. }
  15. CDictionaryFactory::~CDictionaryFactory()
  16. {
  17. }
  19. HRESULT  CDictionaryFactory::QueryInterface(const IID& iid, void **ppv)
  20. {
  21. if ( iid == IID_IUnknown )
  22. {
  23. *ppv = (IUnknown *) this ;
  24. ((IUnknown *)(*ppv))->AddRef() ;
  25. } else if ( iid == IID_IClassFactory) 
  26. {
  27. *ppv = (IClassFactory *) this ;
  28. ((IClassFactory *)(*ppv))->AddRef() ;
  29. } 
  30. else
  31. {
  32. *ppv = NULL;
  33. return E_NOINTERFACE ;
  34. }
  35. return S_OK;
  36. }
  38. ULONG   CDictionaryFactory::AddRef()
  39. {
  40. m_Ref ++;
  41. return  (ULONG) m_Ref;
  42. }
  44. ULONG   CDictionaryFactory::Release()
  45. {
  46. m_Ref --;
  47. if (m_Ref == 0 ) {
  48. delete this;
  49. return 0;
  50. }
  51. return  (ULONG) m_Ref;
  52. }
  54. HRESULT CDictionaryFactory::CreateInstance(IUnknown *pUnknownOuter, 
  55.    const IID& iid, void **ppv)
  56. {
  57.    CDictionary * pObj;   
  58.    HRESULT hr;
  59.    
  60.    *ppv=NULL;
  61.    hr=E_OUTOFMEMORY;
  62.    if (NULL != pUnknownOuter)
  63.    return CLASS_E_NOAGGREGATION;
  64.    
  65.    //Create the object passing function to notify on destruction.
  66.    pObj=new CDictionary();
  67.    if (NULL==pObj)
  68.       return hr;   
  69.    
  70.    //Obtain the first interface pointer (which does an AddRef)
  71.    hr=pObj->QueryInterface(iid, ppv);
  73.    if (hr != S_OK) {
  74.    //Kill the object if initial creation or FInit failed.
  75.       g_DictionaryNumber --; // Reference count g_cDictionary be added in constructor
  76.   delete pObj;
  77.    }
  78.    
  79.    return hr;   
  80. }
  82. HRESULT CDictionaryFactory::LockServer(BOOL bLock)
  83. {
  84. if (bLock)
  85. g_LockNumber ++;
  86. else
  87. {
  88. g_LockNumber --;
  89. if (CanUnloadNow()) {
  90. ::PostThreadMessage(dwMainThreadID, WM_QUIT, 0, 0) ;
  91. }
  92. }
  94. return NOERROR;
  95. }
  97. BOOL CDictionaryFactory::CanUnloadNow()
  98. {
  99. if (g_LockNumber>0 || g_DictionaryNumber >0)
  100. return FALSE;
  101. else 
  102. return TRUE;
  103. }
  105. CDictionaryFactory *CDictionaryFactory::theFactory = NULL;
  106. DWORD CDictionaryFactory::dwRegister = 0;
  107. //
  108. // Register factory
  109. //
  110. BOOL CDictionaryFactory::RegisterFactory()
  111. {
  112. // Create the class factory for dictionary component.
  113. theFactory = new CDictionaryFactory();
  114. theFactory->AddRef();
  115. IUnknown *pUnkForFactory = (IUnknown  *)theFactory;
  117. // Register the class factory.
  118. HRESULT hr = ::CoRegisterClassObject(
  119.               CLSID_Dictionary,
  120.               pUnkForFactory,
  121.               CLSCTX_LOCAL_SERVER,
  122.               REGCLS_MULTIPLEUSE,
  123.               // REGCLS_MULTI_SEPARATE, //@Multi
  124.               &dwRegister) ;
  125. if (FAILED(hr))
  126. {
  127. theFactory->Release() ;
  128. return FALSE ;
  129. }
  130. return TRUE ;
  131. }
  133. //
  134. // Unregister factories
  135. //
  136. void CDictionaryFactory::UnregisterFactory()
  137. {
  138. if (dwRegister != 0) 
  139. {
  140. ::CoRevokeClassObject(dwRegister) ;
  141. }
  143. // Release the class factory.
  144. if (theFactory != NULL)
  145. theFactory->Release();
  146. }