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#pragma once
// This class is used to store the context for a specific enumeration.
class WpdObjectEnumeratorContext : public IUnknown
{
public:
WpdObjectEnumeratorContext() :
m_cRef(1),
m_TotalChildren(0),
m_ChildrenEnumerated(0)
{
}
~WpdObjectEnumeratorContext()
{
}
public: // IUnknown
ULONG __stdcall AddRef()
{
InterlockedIncrement((long*) &m_cRef);
return m_cRef;
}
_At_(this, __drv_freesMem(Mem))
ULONG __stdcall Release()
{
ULONG ulRefCount = m_cRef - 1;
if (InterlockedDecrement((long*) &m_cRef) == 0)
{
delete this;
return 0;
}
return ulRefCount;
}
HRESULT __stdcall QueryInterface(
REFIID riid,
void** ppv)
{
HRESULT hr = S_OK;
if(riid == IID_IUnknown)
{
*ppv = static_cast<IUnknown*>(this);
AddRef();
}
else
{
*ppv = NULL;
hr = E_NOINTERFACE;
}
return hr;
}
private:
DWORD m_cRef;
public:
bool HasMoreChildrenToEnumerate()
{
return ((m_TotalChildren - m_ChildrenEnumerated) > 0);
}
// WpdObjectEnumeratorContext specific data
public:
CAtlStringW m_strParentObjectID; // object identifier of the object whose children are being enumerated
DWORD m_TotalChildren; // number of bytes transferred from the resource to the caller
DWORD m_ChildrenEnumerated; // number of children returned during the enumeration operation
};
class WpdObjectEnumerator
{
public:
WpdObjectEnumerator();
virtual ~WpdObjectEnumerator();
HRESULT DispatchWpdMessage(_In_ REFPROPERTYKEY Command,
_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults);
HRESULT OnStartFind(_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults);
HRESULT OnFindNext(_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults);
HRESULT OnEndFind(_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults);
private:
VOID InitializeEnumerationContext(
_In_ WpdObjectEnumeratorContext* pEnumeratorContext,
_In_ LPCWSTR wszParentObjectID);
HRESULT AddStringValueToPropVariantCollection(
_In_ IPortableDevicePropVariantCollection* pCollection,
_In_ LPCWSTR wszValue);
};
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