shell/source/win32/shlxthandler/classfactory.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_shell.hxx"
  33 #include "internal/global.hxx"
  34 #include "classfactory.hxx"
  35 #include "internal/infotips.hxx"
  36 #include "internal/propsheets.hxx"
  37 #include "internal/columninfo.hxx"
  38 #ifdef __MINGW32__
  39 #include <algorithm>
  40 using ::std::max;
  41 using ::std::min;
  42 #endif
  43 #include "internal/thumbviewer.hxx"
  44 #include "internal/shlxthdl.hxx"
  45
  46 //-----------------------------
  47 //
  48 //-----------------------------
  49
  50 long CClassFactory::s_ServerLocks = 0;
  51
  52 //-----------------------------
  53 //
  54 //-----------------------------
  55
  56 CClassFactory::CClassFactory(const CLSID& clsid) :
  57     m_RefCnt(1),
  58     m_Clsid(clsid)
  59 {
  60     InterlockedIncrement(&g_DllRefCnt);
  61 }
  62
  63 //-----------------------------
  64 //
  65 //-----------------------------
  66
  67 CClassFactory::~CClassFactory()
  68 {
  69     InterlockedDecrement(&g_DllRefCnt);
  70 }
  71
  72 //-----------------------------
  73 // IUnknown methods
  74 //-----------------------------
  75
  76 HRESULT STDMETHODCALLTYPE CClassFactory::QueryInterface(REFIID riid, void __RPC_FAR *__RPC_FAR *ppvObject)
  77 {
  78     *ppvObject = 0;
  79
  80     if (IID_IUnknown == riid || IID_IClassFactory == riid)
  81     {
  82         IUnknown* pUnk = this;
  83         pUnk->AddRef();
  84         *ppvObject = pUnk;
  85         return S_OK;
  86     }
  87
  88     return E_NOINTERFACE;
  89 }
  90
  91 //-----------------------------
  92 //
  93 //-----------------------------
  94
  95 ULONG STDMETHODCALLTYPE CClassFactory::AddRef(void)
  96 {
  97     return InterlockedIncrement(&m_RefCnt);
  98 }
  99
 100 //-----------------------------
 101 //
 102 //-----------------------------
 103
 104 ULONG STDMETHODCALLTYPE CClassFactory::Release(void)
 105 {
 106     long refcnt = InterlockedDecrement(&m_RefCnt);
 107
 108     if (0 == refcnt)
 109         delete this;
 110
 111     return refcnt;
 112 }
 113
 114 //-----------------------------
 115 // IClassFactory methods
 116 //-----------------------------
 117
 118 HRESULT STDMETHODCALLTYPE CClassFactory::CreateInstance(
 119             IUnknown __RPC_FAR *pUnkOuter,
 120             REFIID riid,
 121             void __RPC_FAR *__RPC_FAR *ppvObject)
 122 {
 123     if ((pUnkOuter != NULL))
 124         return CLASS_E_NOAGGREGATION;
 125
 126     IUnknown* pUnk = 0;
 127
 128     if (CLSID_PROPERTYSHEET_HANDLER == m_Clsid)
 129         pUnk = static_cast<IShellExtInit*>(new CPropertySheet());
 130
 131     else if (CLSID_INFOTIP_HANDLER == m_Clsid)
 132         pUnk = static_cast<IQueryInfo*>(new CInfoTip());
 133
 134     else if (CLSID_COLUMN_HANDLER == m_Clsid)
 135         pUnk = static_cast<IColumnProvider*>(new CColumnInfo());
 136
 137     else if (CLSID_THUMBVIEWER_HANDLER == m_Clsid)
 138         pUnk = static_cast<IExtractImage*>(new CThumbviewer());
 139
 140     POST_CONDITION(pUnk != 0, "Could not create COM object");
 141
 142     if (0 == pUnk)
 143         return E_OUTOFMEMORY;
 144
 145     HRESULT hr = pUnk->QueryInterface(riid, ppvObject);
 146
 147     // if QueryInterface failed the component will destroy itself
 148     pUnk->Release();
 149
 150     return hr;
 151 }
 152
 153 //-----------------------------
 154 //
 155 //-----------------------------
 156
 157 HRESULT STDMETHODCALLTYPE CClassFactory::LockServer(BOOL fLock)
 158 {
 159     if (fLock)
 160         InterlockedIncrement(&s_ServerLocks);
 161     else
 162         InterlockedDecrement(&s_ServerLocks);
 163
 164     return S_OK;
 165 }
 166
 167 //-----------------------------
 168 //
 169 //-----------------------------
 170
 171 bool CClassFactory::IsLocked()
 172 {
 173     return (s_ServerLocks > 0);
 174 }