component.cpp

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// component.cpp
#define _WIN32_DCOM

#include <windows.h>
#include <ocidl.h>
#include <iostream.h>
#include <stdio.h>
#include <conio.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}", "AppID", "{10000002-0000-0000-0000-000000000001}" },
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\InprocServer32", 0, (const char*)-1 }, 
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\InprocServer32", "ThreadingModel", "Both" }, 
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\ProgID", 0, "Component.InsideCOM.1" },
	{ "CLSID\\{10000002-0000-0000-0000-000000000001}\\VersionIndependentProgID", 0, "Component.InsideCOM" },
	{ "AppID\\{10000002-0000-0000-0000-000000000001}", 0, "Inside COM+: In Process Component" },
	{ "AppID\\{10000002-0000-0000-0000-000000000001}", "DllSurrogate", "" },
	{ "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 IPrime, public IPipeLong
{
public:
	// IUnknown
	ULONG __stdcall AddRef();
	ULONG __stdcall Release();
	HRESULT __stdcall QueryInterface(REFIID riid, void** ppv);

	// IPrime
	HRESULT __stdcall IsPrime(int testnumber, int* retval);

	// IPipeLong
    HRESULT __stdcall Pull(long* buf, ULONG cRequest, ULONG* pcReturned);
    HRESULT __stdcall Push(long* buf, ULONG cSent);

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

private:
	ULONG m_cRef;
};

HRESULT CInsideCOM::Pull(long* buf, ULONG cRequest, ULONG* pcReturned)
{
	long square = 1;

	for(ULONG count = 0; count < cRequest; count++)
	{
		buf[count] = square++;
	}

	*pcReturned = count;
	return S_OK;
}

HRESULT CInsideCOM::Push(long* buf, ULONG cSent)
{
	return S_OK;
}

HRESULT CInsideCOM::IsPrime(int testnumber, int* retval)
{
	unsigned long count;
	unsigned long HalfNumber = testnumber / 2 + 1;

	for(count = 2; count < HalfNumber; count++)
		if(testnumber % count == 0)
		{
			*retval = false;
			return S_OK;
		}

	*retval = true;
	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 = (IPrime*)this;
	else if(riid == IID_IPipeLong)
		*ppv = (IPipeLong*)this;
	else if(riid == IID_IPrime)
		*ppv = (IPrime*)this;
	else
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	AddRef();
	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 || 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;

	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()
{
	cout << "Component: DllCanUnloadNow() " << (g_cLocks == 0 ? "Yes" : "No") << endl;
	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;

	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;
}