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enum.cpp
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Upload User: xhy777
Upload Date: 2007-02-14
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Code Size: 3k
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Windows Kernel

Development Platform:

Visual C++

enum.cpp：Code Content
  1. //*******************************************************************************************
  2. //
  3. // Filename : Enum.cpp
  4. //
  5. // Implementation for CEnumCabObjs
  6. //
  7. // Copyright (c) 1994 - 1996 Microsoft Corporation. All rights reserved
  8. //
  9. //*******************************************************************************************
  11. #include "pch.h"
  13. #include "thisdll.h"
  14. #include "enum.h"
  16. // *** IUnknown methods ***
  17. STDMETHODIMP CEnumCabObjs::QueryInterface(
  18.    REFIID riid, 
  19.    LPVOID FAR* ppvObj)
  20. {
  21. *ppvObj = NULL;
  23. LPUNKNOWN pObj;
  24.  
  25. if (riid == IID_IUnknown)
  26. {
  27. pObj = (IUnknown*)((IEnumIDList*)this); 
  28. }
  29. else if (riid == IID_IEnumIDList)
  30. {
  31. pObj = (IUnknown*)((IEnumIDList*)this); 
  32. }
  33. else
  34. {
  35.     return(E_NOINTERFACE);
  36. }
  38. pObj->AddRef();
  39. *ppvObj = pObj;
  41. return(NOERROR);
  42. }
  45. STDMETHODIMP_(ULONG) CEnumCabObjs::AddRef(void)
  46. {
  47. return(m_cRef.AddRef());
  48. }
  51. STDMETHODIMP_(ULONG) CEnumCabObjs::Release(void)
  52. {
  53. if (!m_cRef.Release())
  54. {
  55.     delete this;
  56. return(0);
  57. }
  59. return(m_cRef.GetRef());
  60. }
  63. // *** IEnumIDList methods ***
  64. STDMETHODIMP CEnumCabObjs::Next(ULONG celt,
  65.       LPITEMIDLIST *rgelt,
  66.       ULONG *pceltFetched)
  67. {
  68. *rgelt = NULL;
  69. if (pceltFetched)
  70. {
  71. *pceltFetched = 0;
  72. }
  74. HRESULT hRes = m_pcfThis->InitItems();
  75. if (FAILED(hRes))
  76. {
  77. return(hRes);
  78. }
  80. for ( ; ; ++m_iCount)
  81. {
  82. if (m_iCount >= m_pcfThis->m_lItems.GetCount())
  83. {
  84. return(S_FALSE);
  85. }
  87. LPCABITEM pit = m_pcfThis->m_lItems[m_iCount];
  89. if ((m_uFlags&(SHCONTF_FOLDERS|SHCONTF_NONFOLDERS))
  90. != (SHCONTF_FOLDERS|SHCONTF_NONFOLDERS))
  91. {
  92. DWORD gfInOut = SFGAO_FOLDER;
  93. if (FAILED(m_pcfThis->GetAttributesOf(1, (LPCITEMIDLIST *)&pit, &gfInOut)))
  94. {
  95. continue;
  96. }
  97. if (!(m_uFlags&SHCONTF_FOLDERS) && (gfInOut&SFGAO_FOLDER))
  98. {
  99. continue;
  100. }
  101. if ((m_uFlags&SHCONTF_FOLDERS) && !(gfInOut&SFGAO_FOLDER))
  102. {
  103. continue;
  104. }
  105. }
  107. if (!(m_uFlags&SHCONTF_INCLUDEHIDDEN)
  108. && (pit->uFileAttribs&(FILE_ATTRIBUTE_HIDDEN|FILE_ATTRIBUTE_SYSTEM)))
  109. {
  110. continue;
  111. }
  113. break;
  114. }
  116. *rgelt = ILClone((LPCITEMIDLIST)m_pcfThis->m_lItems[m_iCount]);
  118. ++m_iCount;
  120. if (*rgelt)
  121. {
  122. if (pceltFetched)
  123. {
  124. *pceltFetched = 1;
  125. }
  127. return(S_OK);
  128. }
  130. return(E_OUTOFMEMORY);
  131. }
  134. STDMETHODIMP CEnumCabObjs::Skip(ULONG celt)
  135. {
  136. return(E_NOTIMPL);
  137. }
  140. STDMETHODIMP CEnumCabObjs::Reset()
  141. {
  142. m_iCount = 0;
  144. return(NOERROR);
  145. }
  148. STDMETHODIMP CEnumCabObjs::Clone(IEnumIDList **ppenum)
  149. {
  150. return(E_NOTIMPL);
  151. }