124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
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#include "stock.h"
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#pragma hdrstop
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#include "caggunk.h"
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ULONG CAggregatedUnknown::AddRef()
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{
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return _punkAgg->AddRef();
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}
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ULONG CAggregatedUnknown::Release()
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{
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return _punkAgg->Release();
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}
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HRESULT CAggregatedUnknown::QueryInterface(REFIID riid, void **ppvObj)
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{
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return _punkAgg->QueryInterface(riid, ppvObj);
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}
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HRESULT CAggregatedUnknown::CUnkInner::QueryInterface(REFIID riid, void **ppvObj)
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{
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if (IsEqualIID(riid, IID_IUnknown))
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{
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*ppvObj = SAFECAST(this, IUnknown*);
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InterlockedIncrement(&_cRef);
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return S_OK;
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}
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CAggregatedUnknown* pparent = IToClass(CAggregatedUnknown, _unkInner, this);
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return pparent->v_InternalQueryInterface(riid, ppvObj);
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}
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ULONG CAggregatedUnknown::CUnkInner::AddRef(void)
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{
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return InterlockedIncrement(&_cRef);
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}
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ULONG CAggregatedUnknown::CUnkInner::Release(void)
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{
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if (InterlockedDecrement(&_cRef))
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return _cRef;
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CAggregatedUnknown* pparent = IToClass(CAggregatedUnknown, _unkInner, this);
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if (!pparent->v_HandleDelete(&_cRef))
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{
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_cRef = 1000; // protect against cached pointers bumping us up then down
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delete pparent;
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}
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return 0;
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}
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CAggregatedUnknown::CAggregatedUnknown(IUnknown* punkAgg)
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{
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_punkAgg = punkAgg ? punkAgg : &_unkInner;
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}
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CAggregatedUnknown::~CAggregatedUnknown()
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{
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}
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//
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// Convert our controlling unknown to its canonical IUnknown *without*
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// altering the reference count on the outer object.
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//
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// This is critical in order for QueryOuterInterface to work properly.
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//
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// Returns NULL if something horrible went wrong.
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//
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// OLE Magic: Since objects are required also to return the canonical
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// IUnknown in response to any QI(IUnknown), it follows that the canonical
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// IUnknown remains valid so long as there are any outstanding references
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// to the object. In other words, you can Release() the canonical IUnknown
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// and the pointer remains valid so long as you keep the object alive by
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// other means.
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//
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// Believe it or not, this is a feature. It's in the book!
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//
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IUnknown *CAggregatedUnknown::_GetCanonicalOuter(void)
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{
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IUnknown *punkAggCanon;
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HRESULT hres = _punkAgg->QueryInterface(IID_IUnknown, (void **)&punkAggCanon);
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if (SUCCEEDED(hres))
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{
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punkAggCanon->Release(); // see "OLE Magic" comment above
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return punkAggCanon;
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}
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else
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{
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// The outer object is most likely some other shell component,
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// so let's ASSERT so whoever owns the outer component will fix it.
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ASSERT(!"The outer object's implementation of QI(IUnknown) is broken.");
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return NULL;
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}
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}
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void CAggregatedUnknown::_ReleaseOuterInterface(IUnknown** ppunk)
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{
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ASSERT(IS_VALID_CODE_PTR(_punkAgg, IUnknown));
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IUnknown *punkAggCanon = _GetCanonicalOuter(); // non-refcounted pointer
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//
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// SHReleaseOuterInterface can handle punkAggCanon == NULL
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//
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SHReleaseOuterInterface(punkAggCanon, ppunk);
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}
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HRESULT CAggregatedUnknown::_QueryOuterInterface(REFIID riid, void ** ppvOut)
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{
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IUnknown *punkAggCanon = _GetCanonicalOuter(); // non-refcounted pointer
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//
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// SHQueryOuterInterface can handle punkAggCanon == NULL.
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//
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return SHQueryOuterInterface(punkAggCanon, riid, ppvOut);
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}
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