aggregator.cpp

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// aggregator.cpp
#include <iostream.h>
#include "aggregator\aggregator.h" // Generated by MIDL
#include "registry.h" // Add This!!!

const CLSID CLSID_Container = {0x10000012,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01}};
const CLSID CLSID_InsideCOM = {0x10000002,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01}};

long g_cComponents = 0;
long g_cServerLocks = 0;

class CAggregator : public IMultiply
{
public:
	// IUnknown
	ULONG __stdcall AddRef();
	ULONG __stdcall Release();
	HRESULT __stdcall QueryInterface(REFIID iid, void** ppv);

	// IMultiply
	HRESULT __stdcall Multiply(int x, int y, int* retval);

	HRESULT Init();
	CAggregator();
	~CAggregator();

private:
	ULONG m_cRef;
	IUnknown* m_pUnknownInner;
};

CAggregator::CAggregator() : m_cRef(1)
{
	g_cComponents++;
}

// This code goes in an Init method because a constructor cannot return an error code
HRESULT CAggregator::Init()
{
	return CoCreateInstance(CLSID_InsideCOM, (IUnknown*)this, CLSCTX_INPROC_SERVER, IID_IUnknown, (void**)&m_pUnknownInner);
}

CAggregator::~CAggregator()
{
	cout << "Container: CAggregator::~CAggregator()" << endl;
	g_cComponents--;
	m_pUnknownInner->Release();
}

ULONG CAggregator::AddRef()
{
	cout << "Container: CAggregator::AddRef() m_cRef = " << m_cRef + 1 << endl;
	return ++m_cRef;
}

ULONG CAggregator::Release()
{
	cout << "Container: CAggregator::Release() m_cRef = " << m_cRef - 1 << endl;
	if(--m_cRef != 0)
		return m_cRef;
	delete this;
	return 0;
}

HRESULT CAggregator::QueryInterface(REFIID riid, void** ppv)
{
	if(riid == IID_IUnknown)
	{
		cout << "Container: CAggregator::QueryInterface() for IUnknown returning " << this << endl;
		*ppv = (IUnknown*)this;
	}
	else if(riid == IID_ISum)
	{
		cout << "Container: CAggregator::QueryInterface() for ISum calling inside object" << endl;
		return m_pUnknownInner->QueryInterface(riid, ppv);
	}
	else if(riid == IID_IMultiply)
	{
		cout << "Container: CAggregator::QueryInterface() for ISum returning " << this << endl;
		*ppv = (IMultiply*)this;
	}
	else 
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	AddRef();
	return S_OK;
}

HRESULT CAggregator::Multiply(int x, int y, int* retval)
{
	cout << "Container: CAggregator::Multiply() " << x << " * " << y << " = " << x * y << endl;
	*retval = x * y;
	return S_OK;
}

class CFactory : public IClassFactory
{
public:
	// IUnknown
	ULONG __stdcall AddRef();
	ULONG __stdcall Release();
	HRESULT __stdcall QueryInterface(REFIID iid, void** ppv);

	// IClassFactory
	HRESULT __stdcall CreateInstance(IUnknown *pUnknownOuter, REFIID iid, void** ppv);
	HRESULT __stdcall LockServer(BOOL bLock);

	CFactory() : m_cRef(1) { }
	~CFactory() { }

private:
	ULONG m_cRef;
};

ULONG CFactory::AddRef()
{
	cout << "Container: CFactory::AddRef() m_cRef = " << m_cRef + 1 << endl;
	return ++m_cRef;
}

ULONG CFactory::Release()
{
	cout << "Container: CFactory::Release() m_cRef = " << m_cRef - 1 << endl;
	if(--m_cRef != 0)
		return m_cRef;
	delete this;
	return 0;
}

HRESULT CFactory::QueryInterface(REFIID iid, void** ppv)
{
	if((iid == IID_IUnknown) || (iid == IID_IClassFactory))
	{
		cout << "Container: CFactory::QueryInteface() for IUnknown or IClassFactory " << this << endl;
		*ppv = (IClassFactory *)this;
	}
	else
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	AddRef();
	return S_OK;
}

HRESULT CFactory::CreateInstance(IUnknown *pUnknownOuter, REFIID riid, void** ppv)
{
	if(pUnknownOuter != NULL)
		return CLASS_E_NOAGGREGATION;

	CAggregator *pAggregator = new CAggregator();
	if(pAggregator == NULL)
		return E_OUTOFMEMORY;

	pAggregator->Init();

	// QueryInterface probably for IID_IUnknown
	HRESULT hr = pAggregator->QueryInterface(riid, ppv);
	pAggregator->Release();
	return hr;
}

HRESULT CFactory::LockServer(BOOL bLock)
{
	if(bLock)
		g_cServerLocks++;
	else
		g_cServerLocks--;
	return S_OK;
}

HRESULT __stdcall DllCanUnloadNow()
{
	cout << "Container: DllCanUnloadNow() " << (g_cServerLocks == 0 && g_cComponents == 0 ? "Yes" : "No") << endl;
	if(g_cServerLocks == 0 && g_cComponents == 0)
		return S_OK;
	else
		return S_FALSE;
}

HRESULT __stdcall DllGetClassObject(REFCLSID clsid, REFIID iid, void** ppv)
{
	cout << "Container: DllGetClassObject" << endl;
	
	if(clsid != CLSID_Container)
		return CLASS_E_CLASSNOTAVAILABLE;

	CFactory* pFactory = new CFactory;
	if(pFactory == NULL)
		return E_OUTOFMEMORY;

	// QueryInterface probably for IClassFactory
	HRESULT hr = pFactory->QueryInterface(iid, ppv);
	pFactory->Release();
	return hr;
}

HRESULT __stdcall DllRegisterServer()
{
	return RegisterServer("aggregator.dll", CLSID_Container, "Inside COM+ Aggregation Sample", "Component.Container", "Component.Container.1", NULL);
}

HRESULT __stdcall DllUnregisterServer()
{
	return UnregisterServer(CLSID_Container, "Component.Container", "Component.Container.1");
}