74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
#ifndef __NmEnum_h__
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#define __NmEnum_h__
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// This is used to create IEnumXXX objects for CSimpleArray<CComPtr<XXX> > objects
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template <class TEnum, class TItf>
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HRESULT CreateEnumFromSimpleAryOfInterface(CSimpleArray<TItf*>& rObjArray, TEnum** ppEnum)
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{
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DBGENTRY(CreateEnum);
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HRESULT hr = S_OK;
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typedef CComEnum<TEnum, &__uuidof(TEnum), TItf*, _CopyInterface<TItf> > enum_type;
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enum_type* pComEnum = new CComObject< enum_type >;
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if(pComEnum)
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{
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TItf** apInterface = NULL;
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int nItems = rObjArray.GetSize();
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if(nItems)
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{
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apInterface = new TItf*[nItems];
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if(apInterface)
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{
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for(int i = 0; i < rObjArray.GetSize(); ++i)
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{
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hr = rObjArray[i]->QueryInterface(__uuidof(TItf), reinterpret_cast<void**>(&apInterface[i]));
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if(FAILED(hr))
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{
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delete [] apInterface;
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goto end;
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}
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}
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}
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else
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{
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hr = E_OUTOFMEMORY;
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}
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}
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TItf** begin = apInterface;
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TItf** end = apInterface + nItems;
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if(begin == end)
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{
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// Hack to get around ATL bug.
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// The problem is that for empty enums ATL returns E_FAIL for Next instead of S_FALSE
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hr = pComEnum->Init(reinterpret_cast<TItf**>(69), reinterpret_cast<TItf**>(69), NULL, AtlFlagNoCopy);
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}
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else
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{
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hr = pComEnum->Init(begin, end, NULL, AtlFlagTakeOwnership);
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}
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if(SUCCEEDED(hr))
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{
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hr = pComEnum->QueryInterface(__uuidof(TEnum), reinterpret_cast<void**>(ppEnum));
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}
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}
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else
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{
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hr = E_NOINTERFACE;
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}
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end:
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DBGEXIT_HR(CreateEnum,hr);
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return hr;
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}
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#endif // __NmEnum_h__
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