http://www.codeproject.com/com/outlookcontacts.asp

#include <IOSTREAM>using namespace std;
#define interface class __declspec(novtable)interface ICodec
{
	public:	virtual bool Decode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen);
	virtual bool Encode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen);
};
class CCodec : public ICodec
{
	public:	virtual bool Decode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen)
 	{
		cout << "解码..." << endl;
		return true;	
	}
	virtual bool Encode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen)	
	{	
		cout << "编码..." << endl;
		return true;	
	}
};
int main(int argc, char* argv[]){
 	ICodec * pCodec = new CCodec();
	pCodec->Decode(NULL,0,NULL,NULL);
	pCodec->Encode(NULL,0,NULL,NULL);
	delete (CCodec*)pCodec;
	return 0;
}
上面的ICodec接口等价于下面的定义：
class ICodec{
public:	virtual bool Decode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen)=0;
virtual bool Encode(char * lpDataSrc,unsigned int nSrcLen,char * lpDataDst,unsigned int *pnDstLen)=0;
};