141 lines
3 KiB
C
141 lines
3 KiB
C
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#ifndef _UNK_H_
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#define _UNK_H_
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#include <objbase.h>
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typedef void (*COMFACTORYCB)(BOOL fIncrement);
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class CCOMBase
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{
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public:
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virtual HRESULT UnkInit() { return S_OK; }
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};
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struct INTFMAPENTRY
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{
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const IID* piid;
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DWORD dwOffset;
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};
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template <class CCOMBASE>
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class CUnkTmpl : public CCOMBASE
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{
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public:
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CUnkTmpl(IUnknown*) : _cRef(1) {}
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~CUnkTmpl() { if (_cfcb) { _cfcb(FALSE); } }
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STDMETHODIMP QueryInterface(REFIID riid, void** ppv)
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{
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HRESULT hres;
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if (IID_IUnknown == riid)
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{
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IUnknown* punk;
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*ppv = (IUnknown*)(((PBYTE)this) + _pintfmap[0].dwOffset);
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punk = (IUnknown*)(*ppv);
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punk->AddRef();
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hres = S_OK;
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}
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else
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{
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hres = _GetInterfaceFromMap(riid, ppv);
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}
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return hres;
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}
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STDMETHODIMP_(ULONG) AddRef() { return ::InterlockedIncrement((LONG*)&_cRef); }
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STDMETHODIMP_(ULONG) Release()
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{
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ULONG cRef = ::InterlockedDecrement((LONG*)&_cRef);
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if (!cRef)
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{
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delete this;
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}
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return cRef;
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}
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protected:
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HRESULT _GetInterfaceFromMap(REFIID riid, void** ppv)
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{
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HRESULT hres = E_NOINTERFACE;
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for (DWORD dw = 0; dw < _cintfmap; ++dw)
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{
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if (riid == *(_pintfmap[dw].piid))
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{
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IUnknown* punk = (IUnknown*)(((PBYTE)this) +
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_pintfmap[dw].dwOffset);
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punk->AddRef();
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*ppv = punk;
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hres = S_OK;
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break;
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}
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}
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return hres;
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}
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public:
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static HRESULT UnkCreateInstance(COMFACTORYCB cfcb,
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IUnknown* pUnknownOuter, IUnknown** ppunkNew)
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{
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HRESULT hres = E_OUTOFMEMORY;
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if (!_cfcb)
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{
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_cfcb = cfcb;
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}
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CUnkTmpl<CCOMBASE>* pNew = new CUnkTmpl<CCOMBASE>(pUnknownOuter);
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if (pNew)
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{
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hres = pNew->UnkInit();
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if (FAILED(hres))
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{
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delete pNew;
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}
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else
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{
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*ppunkNew = (IUnknown*)(((PBYTE)pNew) +
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pNew->_pintfmap[0].dwOffset);
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}
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}
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return hres;
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}
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private:
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ULONG _cRef;
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static COMFACTORYCB _cfcb;
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static const INTFMAPENTRY* _pintfmap;
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static const DWORD _cintfmap;
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};
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// for now: begin
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#ifndef OFFSETOFCLASS
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//*** OFFSETOFCLASS -- (stolen from ATL)
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// we use STATIC_CAST not SAFE_CAST because the compiler gets confused
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// (it doesn't constant-fold the ,-op in SAFE_CAST so we end up generating
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// code for the table!)
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#define OFFSETOFCLASS(base, derived) \
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((DWORD)(DWORD_PTR)(static_cast<base*>((derived*)8))-8)
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#endif
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// for now: end
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#define _INTFMAPENTRY(Cthis, Ifoo) \
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{ (IID*) &IID_##Ifoo, OFFSETOFCLASS(Ifoo, Cthis) }
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#define _INTFMAPENTRY2(Cthis, Ifoo, Iimpl) \
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{ (IID*) &IID_##Ifoo, OFFSETOFCLASS(Iimpl, Cthis) }
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#endif // _UNK_H_
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