求com应用的小例子@

[迷途的书童]

越简单越好，

只是对com的使用一直比较困惑。

很想知道com怎么封装接口

怎么在主程序里面调用。


谢谢@

[一名程序员]

看msdn中的inside OLE2。

[迷途的书童]

msdn 好像没有inside OLE2 相关介绍@

[cdsnpeter]

http://download.csdn.net/source/1401481

潘老师的COM原理和应用随书代码。

[wshcdr]

恩..............

[洗洗睡去]

不错啊 学习

[catnm]

u p

[paerxiushi]

给你一个最简单的COM组件类:

void trace(const char* mess){cout<<mess<<endl;}
class CA:public IX,public IY
{
public:
	virtual HRESULT _stdcall QueryInterface(const IID& riid, void **ppvObject);
	virtual ULONG _stdcall AddRef();
	virtual ULONG _stdcall Release();
private:
	long m_cRef;
public:
	CA():m_cRef(0){}
	~CA();
public:
	virtual void _stdcall Fx(){cout<<"CA::Fx()"<<endl;}
	virtual void _stdcall Fy(){cout<<"CA::Fy()"<<endl;}

};

CA::~CA()
{
	trace("CA:Release himself");
}

HRESULT _stdcall CA::QueryInterface(const IID& riid, void **ppvObject)
{
	if(riid==IID_IUnknown)
	{
		trace("client get the interface IUnkown");
		*ppvObject=static_cast<IX*>(this);
	}
	else if(riid==IID_IX)
	{
		trace("client get the interface IX.");
		*ppvObject=static_cast<IX*>(this);
	}
	else if (riid==IID_IY)
	{
		trace("client get the interface IY");
		*ppvObject=static_cast<IY*>(this);
	}
	else if (riid==IID_IZ)
	{
		trace("client can not get the interface IZ");
		*ppvObject=NULL;
		return E_NOINTERFACE;
	}
	else 
	{
		trace("the component do not support this interface");
		*ppvObject=NULL;
		return E_NOINTERFACE;
	}
	reinterpret_cast<IX*>(this)->AddRef();
	return S_OK;
}

ULONG _stdcall CA::AddRef()
{
	trace("CA:QA add ref count");
	return ::InterlockedIncrement(&m_cRef);
}

ULONG _stdcall CA::Release()
{
	trace("CA:QA substract ref count");
	if(InterlockedDecrement(&m_cRef)==0)
	{
		delete this;
		return 0;
	}
	return m_cRef;

}