161 lines
3.9 KiB
C++
161 lines
3.9 KiB
C++
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//+---------------------------------------------------------------------
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//
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// File: stdfact.cxx
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//
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// Contents: Standard IClassFactory implementation
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//
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// Classes: StdClassFactory
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//
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//----------------------------------------------------------------------
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#include "headers.hxx"
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#pragma hdrstop
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::StdClassFactory, public
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//
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// Synopsis: Constructor for StdUnknown class
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//
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//----------------------------------------------------------------
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StdClassFactory::StdClassFactory(void)
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{
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_ulRefs = 0;
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_ulLocks = 0;
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}
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::AddRef, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP_(ULONG)
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StdClassFactory::AddRef(void)
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{
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return ++_ulRefs;
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}
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::Release, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP_(ULONG)
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StdClassFactory::Release(void)
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{
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Assert(_ulRefs > 0);
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--_ulRefs;
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#if DBG
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if(_ulRefs == 0)
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DOUT(TEXT("StdClassFactory::Release _ulRefs == 0\r\n"));
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#endif
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return _ulRefs;
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}
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::QueryInterface, public
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//
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// Synopsis: Method of IUnknown interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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StdClassFactory::QueryInterface(REFIID riid, LPVOID FAR* ppv)
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{
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#if DBG
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TCHAR achBuffer[256];
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wsprintf(achBuffer,
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TEXT("StdClassFactory::QueryInterface (%lx)\r\n"),
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riid.Data1);
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DOUT(achBuffer);
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#endif
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if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory))
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{
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AddRef();
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*ppv = (LPCLASSFACTORY)this;
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return NOERROR;
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}
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*ppv = NULL;
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DOUT(TEXT("StdClassFactory::QueryInterface returning E_NOINTERFACE\r\n"));
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return E_NOINTERFACE;
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}
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::LockServer, public
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//
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// Synopsis: Method of IClassFactory interface
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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StdClassFactory::LockServer (BOOL fLock)
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{
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if (fLock)
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{
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_ulLocks++;
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}
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else
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{
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Assert(_ulLocks > 0);
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_ulLocks--;
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}
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return NOERROR;
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}
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#ifdef DOCGEN
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::CreateInstance, public
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//
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// Synopsis: Manufactures an instance of the class
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//
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// Notes: This pure virtual function must be overridden by the inheriting
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// class because the base class does not know what class to
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// instantiate.
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//
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//----------------------------------------------------------------
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STDMETHODIMP
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StdClassFactory::CreateInstance(LPUNKNOWN pUnkOuter,
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REFIID iid,
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LPVOID FAR* ppv) {};
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//REVIEW: how to enforce ref counting of Class factory in object
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// constructor/destructor? Can we do this in a conjunction of StdUnknown
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// with StdClassFactory.
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#endif // DOCGEN
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//+---------------------------------------------------------------
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//
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// Member: StdClassFactory::CanUnload, public
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//
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// Synopsis: Returns TRUE iff there are no extant instances of
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// this class, outstanding references on the class factory,
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// or locks on the class factory.
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//
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// Notes: This function is for use in the standard DllCanUnloadNow
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// function.
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//
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//----------------------------------------------------------------
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BOOL
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StdClassFactory::CanUnload(void)
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{
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return _ulRefs == 0 && _ulLocks == 0;
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}
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