161 lines
3 KiB
C++
161 lines
3 KiB
C++
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// Copyright (c) 1997-1999 Microsoft Corporation
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//
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// Class Factory template
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//
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// 8-20-97 sburns
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#ifndef TEMPFACT_HPP_INCLUDED
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#define TEMPFACT_HPP_INCLUDED
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// COM class factory implementation
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template <class C>
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class ClassFactory : public IClassFactory
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{
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public:
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ClassFactory()
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:
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refcount(1) // implicit AddRef
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{
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LOG_CTOR(ClassFactory);
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}
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// IUnknown overrides
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virtual
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ULONG __stdcall
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AddRef()
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{
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LOG_ADDREF(ClassFactory::AddRef);
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return Win::InterlockedIncrement(refcount);
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}
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virtual
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ULONG __stdcall
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Release()
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{
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LOG_RELEASE(ClassFactory);
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if (Win::InterlockedDecrement(refcount) == 0)
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{
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delete this;
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return 0;
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}
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return refcount;
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}
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virtual
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HRESULT __stdcall
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QueryInterface(const IID& interfaceID, void** interfaceDesired)
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{
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LOG_FUNCTION(ClassFactory::QueryInterface);
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ASSERT(interfaceDesired);
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HRESULT hr = 0;
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if (!interfaceDesired)
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{
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hr = E_INVALIDARG;
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LOG_HRESULT(hr);
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return hr;
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}
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if (interfaceID == IID_IUnknown)
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{
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// LOG(L"Supplying IUnknown interface");
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*interfaceDesired =
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static_cast<IUnknown*>(static_cast<IClassFactory*>(this));
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}
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else if (interfaceID == IID_IClassFactory)
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{
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// LOG(L"Supplying IClassFactory interface");
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*interfaceDesired = static_cast<IClassFactory*>(this);
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}
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else
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{
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*interfaceDesired = 0;
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hr = E_NOINTERFACE;
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LOG(
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L"interface not supported: "
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+ Win::StringFromGUID2(interfaceID));
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LOG_HRESULT(hr);
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return hr;
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}
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AddRef();
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return S_OK;
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}
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// IClassFactory overrides
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virtual
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HRESULT __stdcall
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CreateInstance(
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IUnknown* outerUnknown,
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const IID& interfaceID,
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void** interfaceDesired)
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{
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LOG_FUNCTION(ClassFactory::CreateInstance);
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HRESULT hr = 0;
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if (outerUnknown)
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{
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hr = CLASS_E_NOAGGREGATION;
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LOG_HRESULT(hr);
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return hr;
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}
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// the instance starts with a ref count of 1. If the QI fails, then it
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// will self-destruct upon release.
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C* c = new C;
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hr = c->QueryInterface(interfaceID, interfaceDesired);
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c->Release();
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return hr;
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}
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virtual
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HRESULT __stdcall
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LockServer(BOOL lock)
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{
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LOG_FUNCTION(ClassFactory::LockServer);
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ComServerLockState::LockServer(lock ? true : false);
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return S_OK;
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}
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private:
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// only Release can cause us to be deleted
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virtual
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~ClassFactory()
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{
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LOG_DTOR(ClassFactory);
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ASSERT(refcount == 0);
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}
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// not implemented; no instance copying allowed.
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ClassFactory(const ClassFactory&);
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const ClassFactory& operator=(const ClassFactory&);
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ComServerReference dllref;
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long refcount;
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};
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#endif // TEMPFACT_HPP_INCLUDED
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