使用ace6.1.0验证。

Recv：

int  CMulticastReceiver::start(const char* ip, const unsigned short usPort){	ACE_INET_Addr tempAddr(usPort, ip);	m_cast_addr_.set(tempAddr);	// Subscribe to multicast address.	if (m_cast_dgram_.join(m_cast_addr_) == -1)	{		std::cout << "Error in subscribing to Multicast address " << std::endl;		return -1;	}	//get ready to receive data from the sender.	ACE_INET_Addr        remote_addr_;	char buff[100] = {0};	if(m_cast_dgram_.recv (buff, 100, remote_addr_) == -1)	{		std::cout << "error happen when recv" << std::endl;		return -1;	}	std::cout << " Received multicast from :" << 		remote_addr_.get_host_name() << "  " << remote_addr_.get_port_number() 		<< "   " << buff << std::endl;	return 0;}int  CMulticastReceiver::stop(){	if(m_cast_dgram_.leave(m_cast_addr_) == -1)	{		std::cout << "some error happen when leave.. " << std::endl;		return -1;	}	std::cout << "multicast leave success.." << std::endl;	return 0;}

Send：

#define DEFAULT_MULTICAST_ADDR "224.2.2.2"int send_multicast(const ACE_INET_Addr &mcast_addr){	const char *message = "this is the message!\n";	ACE_SOCK_Dgram_Mcast udp;	if (-1 == udp.join (mcast_addr))	{		ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),			ACE_TEXT ("join")), -1);		std::cout << "join error" << std::endl;		return -1;	}	ssize_t sent = udp.send (message,		ACE_OS_String::strlen (message) + 1);	udp.close();	if (sent == -1)	{		ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),		ACE_TEXT ("send")), -1);		std::cout << "send error" << std::endl;		return -1;	}	std::cout << "send success!.." << std::endl;	return 0;}