component.cpp

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// component.cpp
#include <ocidl.h>
#include <iostream.h>
#include "Component\component.h" // Generated by MIDL
#include "registry.h"

const REG_DATA g_regData[] = {
    { "CLSID\\{10000002-0000-0000-0000-000000000001}", 0, "Inside COM+: In Process Component" },
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\InprocServer32", 0, (const char*)-1 }, 
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\ProgID", 0, "Component.InsideCOM.1" },
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\VersionIndependentProgID", 0, "Component.InsideCOM" },
	{ "Component.InsideCOM", 0, "Inside COM+: In Process Component" },
	{ "Component.InsideCOM\\CLSID", 0, "{10000002-0000-0000-0000-000000000001}" },
	{ "Component.InsideCOM\\CurVer", 0, "Component.InsideCOM.1" },
	{ "Component.InsideCOM.1", 0, "Inside COM+: In Process Component" },
	{ "Component.InsideCOM.1\\CLSID", 0, "{10000002-0000-0000-0000-000000000001}" },
	{ 0, 0, 0 }
};

HINSTANCE g_hInstance;
long g_cLocks = 0;

class CInsideCOM : public ISum, public IPersistStream, public IPersistStreamInit
{
public:
	// IUnknown
	ULONG __stdcall AddRef();
	ULONG __stdcall Release();
	HRESULT __stdcall QueryInterface(REFIID riid, void** ppv);

	// ISum
	HRESULT __stdcall Sum(int x, int y, int* retval);
	HRESULT __stdcall SumPersist(int* retval);

	// IPersistStream
    HRESULT __stdcall IsDirty(void);
    HRESULT __stdcall Load(IStream *pStm);
    HRESULT __stdcall Save(IStream *pStm, BOOL fClearDirty);
    HRESULT __stdcall GetSizeMax(ULARGE_INTEGER *pcbSize);

	// IPersistStreamInit
    HRESULT __stdcall InitNew(void);

	// IPersist
	HRESULT __stdcall GetClassID(CLSID* pClassID);

	CInsideCOM() : m_cRef(1) { g_cLocks++; }
	~CInsideCOM()
		{
		cout << "Component: CInsideCOM::~CInsideCOM()" << endl;
		g_cLocks--;
		}

private:
	ULONG m_cRef;
	int m_x;
	int m_y;
};

HRESULT CInsideCOM::InitNew(void)
{
	MessageBox(NULL, "InitNew", "Test", MB_OK);
	return S_OK;
}

HRESULT CInsideCOM::GetClassID(CLSID* pClassID)
{
	MessageBox(NULL, "GetClassID", "Test", MB_OK);
	*pClassID = CLSID_InsideCOM;
	return S_OK;
}

HRESULT CInsideCOM::IsDirty(void)
{
	MessageBox(NULL, "IsDirty", "Test", MB_OK);
	return S_OK;
}

HRESULT CInsideCOM::Load(IStream *pStm)
{
	ULONG read = 0;
	int data[2] = { 0, 0 };
	pStm->Read(data, sizeof(data), &read);
	m_x = data[0];
	m_y = data[1];

	char say[255];
	wsprintf(say, "IPersistStream::Load read = %d, x = %d, y = %d, %0x", read, m_x, m_y, this);
	MessageBox(NULL, say, "Test", MB_OK);
	return S_OK;
}

HRESULT CInsideCOM::Save(IStream *pStm, BOOL fClearDirty)
{
	ULONG written = 0;
	int data[2] = { m_x, m_y };
	HRESULT hr = pStm->Write(data, sizeof(data), &written);
	
	char say[255];
	wsprintf(say, "IPersistStream::Save written = %d", written);
	MessageBox(NULL, say, "Test", MB_OK);
	return S_OK;
}

HRESULT CInsideCOM::GetSizeMax(ULARGE_INTEGER *pcbSize)
{
	MessageBox(NULL, "GetSizeMax", "Test", MB_OK);
	(*pcbSize).QuadPart = 8;
	return S_OK;
}

ULONG CInsideCOM::AddRef()
{
	return ++m_cRef;
}

ULONG CInsideCOM::Release()
{
	if(--m_cRef != 0)
		return m_cRef;
	delete this;
	return 0;
}

HRESULT CInsideCOM::QueryInterface(REFIID riid, void** ppv)
{
	if(riid == IID_IUnknown)
		*ppv = (ISum*)this;
	else if(riid == IID_ISum)
		*ppv = (ISum*)this;
	else if(riid == IID_IPersistStream)
		*ppv = (IPersistStream*)this;
	else if(riid == IID_IPersistStreamInit)
		*ppv = (IPersistStreamInit*)this;
	else 
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	AddRef();
	return S_OK;
}

HRESULT CInsideCOM::SumPersist(int* retval)
{
	*retval = m_x + m_y;
	char say[255];
	wsprintf(say, "ISum::SumPersist x = %d, y = %d, %0x", m_x, m_y, this);
	MessageBox(NULL, say, "Test", MB_OK);

	return S_OK;
}

HRESULT CInsideCOM::Sum(int x, int y, int* retval)
{
	*retval = x + y;

	// store values for SumPersist
	m_x = x;
	m_y = y;

	return S_OK;
}

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

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

	CFactory() : m_cRef(1) { g_cLocks++; }
	~CFactory() { g_cLocks--; }

private:
	ULONG m_cRef;
};

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

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

HRESULT CFactory::QueryInterface(REFIID riid, void** ppv)
{
	if(riid == IID_IUnknown)
		*ppv = (IUnknown*)this;
	else if(riid == IID_IClassFactory)
		*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;

	CInsideCOM *pInsideCOM = new CInsideCOM;

	if(pInsideCOM == NULL)
		return E_OUTOFMEMORY;

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

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

HRESULT __stdcall DllCanUnloadNow()
{
	if(g_cLocks == 0)
		return S_OK;
	else
	    return S_FALSE;
}

HRESULT __stdcall DllGetClassObject(REFCLSID clsid, REFIID riid, void** ppv)
{
	if(clsid != CLSID_InsideCOM)
		return CLASS_E_CLASSNOTAVAILABLE;

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

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

HRESULT __stdcall DllRegisterServer()
{
	char DllPath[MAX_PATH];
	GetModuleFileName(g_hInstance, DllPath, sizeof(DllPath));

	OLECHAR wDllPath[MAX_PATH];
	mbstowcs(wDllPath, DllPath, sizeof(wDllPath));

	ITypeLib* pTypeLib;
	HRESULT hr = LoadTypeLibEx(wDllPath, REGKIND_REGISTER, &pTypeLib);
	if(FAILED(hr))
		return hr;
	pTypeLib->Release();

	return RegisterServerEx(g_regData, DllPath);
}

HRESULT __stdcall DllUnregisterServer()
{
	UnRegisterTypeLib(LIBID_Component, 1, 0, LANG_NEUTRAL, SYS_WIN32);
	return UnregisterServerEx(g_regData);
}

BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, void* pv)
{
	g_hInstance = hInstance;
	return TRUE;
}