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pubenum.cpp
Package: shell.rar　[view]
Upload User: xhy777
Upload Date: 2007-02-14
Package Size: 24088k
Code Size: 3k
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Windows Kernel

Development Platform:

Visual C++

pubenum.cpp：Code Content
  1. //---------------------------------------------------------------------------
  2. //
  3. // Copyright (c) Microsoft Corporation 
  4. //
  5. // File: pubenum.cpp
  6. //
  7. // The current order of enumeration is Legacy --> Darwin --> SMS
  8. //
  9. // History:
  10. //         1-18-97  by dli
  11. //------------------------------------------------------------------------
  12. #include "priv.h"
  14. // Do not build this file if on Win9X or NT4
  15. #ifndef DOWNLEVEL_PLATFORM
  17. #include "pubenum.h"
  20. void _DestroyHdpaEnum(HDPA hdpaEnum)
  21. {
  22.     ASSERT(IsValidHDPA(hdpaEnum));
  23.     IEnumPublishedApps * pepa;
  24.     int idpa;
  25.     for (idpa = 0; idpa < DPA_GetPtrCount(hdpaEnum); idpa++)
  26.     {
  27.         pepa = (IEnumPublishedApps *)DPA_GetPtr(hdpaEnum, idpa);
  28.         if (EVAL(pepa))
  29.             pepa->Release();
  30.     }
  32.     DPA_Destroy(hdpaEnum);
  33. }
  35. CShellEnumPublishedApps::CShellEnumPublishedApps(HDPA hdpaEnum) : _cRef(1), _hdpaEnum(hdpaEnum)
  36. {
  37. }
  39. CShellEnumPublishedApps::~CShellEnumPublishedApps()
  40. {
  41.     if (_hdpaEnum)
  42.         _DestroyHdpaEnum(_hdpaEnum);
  43. }
  45. // IEnumPublishedApps::QueryInterface
  46. HRESULT CShellEnumPublishedApps::QueryInterface(REFIID riid, LPVOID * ppvOut)
  47. { 
  48.     static const QITAB qit[] = {
  49.         QITABENT(CShellEnumPublishedApps, IEnumPublishedApps),                  // IID_IEnumPublishedApps
  50.         { 0 },
  51.     };
  53.     return QISearch(this, qit, riid, ppvOut);
  54. }
  56. // IEnumPublishedApps::AddRef
  57. ULONG CShellEnumPublishedApps::AddRef()
  58. {
  59.     _cRef++;
  60.     TraceMsg(TF_OBJLIFE, "CShellEnumPublishedApps()::AddRef called, new _cRef=%lX", _cRef);
  61.     return _cRef;
  62. }
  64. // IEnumPublishedApps::Release
  65. ULONG CShellEnumPublishedApps::Release()
  66. {
  67.     _cRef--;
  68.     TraceMsg(TF_OBJLIFE, "CShellEnumPublishedApps()::Release called, new _cRef=%lX", _cRef);
  69.     if (_cRef > 0)
  70.         return _cRef;
  72.     delete this;
  73.     return 0;
  74. }
  77. // IEnumPublishedApps::Next
  78. HRESULT CShellEnumPublishedApps::Next(IPublishedApp ** ppia)
  79. {
  80.     HRESULT hres = E_FAIL;
  81.     if (_hdpaEnum)
  82.     {
  83.         IEnumPublishedApps * pepa = (IEnumPublishedApps *)DPA_GetPtr(_hdpaEnum, _iEnum);
  85.         // If pepa is not valid or pepa->Next failed, we skip this Enumerator, and go on to the next
  86.         // one until we hit the limit
  87.         
  88.         while ((!pepa || FAILED(hres = pepa->Next(ppia)))  && (_iEnum < DPA_GetPtrCount(_hdpaEnum)))
  89.         {
  90.             _iEnum++;
  91.             pepa = (IEnumPublishedApps *)DPA_GetPtr(_hdpaEnum, _iEnum);
  92.         }
  93.     }    
  94.     return hres;
  95. }
  98. // IEnumPublishedApps::Reset
  99. HRESULT CShellEnumPublishedApps::Reset(void)
  100. {
  101.     // Call reset on everyone in the list and set our index iEnum to 0;
  102.     if (_hdpaEnum)
  103.     {
  104.         IEnumPublishedApps * pepa;
  105.         int idpa;
  106.         for (idpa = 0; idpa < DPA_GetPtrCount(_hdpaEnum); idpa++)
  107.         {
  108.             pepa = (IEnumPublishedApps *)DPA_GetPtr(_hdpaEnum, idpa);
  109.             if (pepa)
  110.                 pepa->Reset();
  111.         }
  113.         _iEnum = 0;
  115.         return S_OK;
  116.     }
  117.     
  118.     return E_FAIL;
  119. }
  121. #endif //DOWNLEVEL_PLATFORM