component.cpp

经验交流,从网上下载的好东西望大家分享

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

HINSTANCE g_hInstance;
long g_cComponents = 0;
long g_cServerLocks = 0;

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

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

	// ISupportErrorInfo
	HRESULT __stdcall InterfaceSupportsErrorInfo(REFIID riid);

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

private:
	ULONG m_cRef;
};

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

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

HRESULT CInsideCOM::QueryInterface(REFIID riid, void** ppv)
{
	if(riid == IID_IUnknown)
	{
		cout << "Component: CInsideCOM::QueryInterface() for IUnknown returning " << this << endl;
		*ppv = reinterpret_cast<IUnknown*>(this);
	}
	else if(riid == IID_ISum)
	{
		cout << "Component: CInsideCOM::QueryInterface() for ISum returning " << this << endl;
		*ppv = (ISum*)this;
	}
	else if(riid == IID_ISupportErrorInfo)
	{
		cout << "Component: CInsideCOM::QueryInterface() for ISum returning " << this << endl;
		*ppv = (ISupportErrorInfo*)this;
	}
	else 
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	AddRef();
	return S_OK;
}

HRESULT CInsideCOM::InterfaceSupportsErrorInfo(REFIID riid)
{
	if(riid == IID_ISum)
		return S_OK;
	else
		return S_FALSE;
}

HRESULT CInsideCOM::Sum(int x, int y, int* retval)
{
	if(x < 0 || y < 0)
	{
		ICreateErrorInfo* pCreateErrorInfo;
		CreateErrorInfo(&pCreateErrorInfo);
		pCreateErrorInfo->SetDescription(L"Negative numbers not allowed");
		pCreateErrorInfo->SetGUID(IID_ISum);
		pCreateErrorInfo->SetSource(L"Component.InsideCOM");

//		If you support a help file add these lines...
//		pCreateErrorInfo->SetHelpFile(L"c:\component\myhelpfile.hlp");
//		pCreateErrorInfo->SetHelpContext(234);

		IErrorInfo* pErrorInfo;
		pCreateErrorInfo->QueryInterface(IID_IErrorInfo, (void**)&pErrorInfo);

		SetErrorInfo(0, pErrorInfo);
		pErrorInfo->Release();
		pCreateErrorInfo->Release();

		return E_INVALIDARG;
	}

	cout << "Component: CInsideCOM::Sum() " << 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 << "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 iid, void** ppv)
{
	if((iid == IID_IUnknown) || (iid == IID_IClassFactory))
	{
		cout << "Component: 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;

	CInsideCOM *pInsideCOM = new CInsideCOM;
	cout << "Component: CFactory::CreateInstance() " << pInsideCOM << endl;

	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 fLock)
{
	if(fLock)
		g_cServerLocks++;
	else
		g_cServerLocks--;
	return S_OK;
}

HRESULT __stdcall DllCanUnloadNow()
{
	cout << "Component: 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 << "Component: DllGetClassObject" << endl;
	
	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(iid, ppv);
	pFactory->Release();
	return hr;
}

HRESULT __stdcall DllRegisterServer()
{
	char DllPath[256];
	OLECHAR wDllPath[256];
	GetModuleFileName(g_hInstance, DllPath, 256);
	mbstowcs(wDllPath, DllPath, 256);
	ITypeLib* pTypeLib;
	HRESULT hr = LoadTypeLibEx(wDllPath, REGKIND_REGISTER, &pTypeLib);
	if(FAILED(hr))
		return hr;
	pTypeLib->Release();

	return RegisterServer("component.dll", CLSID_InsideCOM, "Inside COM Sample", "Component.InsideCOM", "Component.InsideCOM.1", "Apartment");
}

HRESULT __stdcall DllUnregisterServer()
{
	HRESULT hr = UnRegisterTypeLib(LIBID_Component, 1, 0, LANG_NEUTRAL, SYS_WIN32);
	if(FAILED(hr))
		return hr;
	return UnregisterServer(CLSID_InsideCOM, "Component.InsideCOM", "Component.InsideCOM.1");
}

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