client.cpp

void client::connect(const boost::system::error_code& error)
{
	boost::system::error_code ec;
	boost::asio::socket_base::keep_alive option(true);
	//혹시 타임아웃 때문에 그런가 하고 넣어줬습니다
	_socket.set_option(option, ec);
	if (ec) {
		std::cerr << ec.value() << std::endl;
		exit(0);
	}	

	if (!error) {
		_socket.async_read_some(
			boost::asio::buffer(recv_buf.get()->data(), Packet::MAX_LEN),
			boost::bind(&client::read,
				this,
				asio::placeholders::error)
			);
	}
}
void client::handle_send(const boost::system::error_code & error) {
		_socket.async_read_some(
			boost::asio::buffer(recv_buf.get()->data(), Packet::MAX_LEN),
			boost::bind(&client::read,
				this,
				asio::placeholders::error)
			);
	}
}

void client::send(Packet::packet_ptr& p)
{
	_socket.async_write_some(
		boost::asio::buffer(p.get()->data(), p.get()->length()),
		boost::bind(&client:: handle_send,
			this,
			asio::placeholders::error)
	);
}


void client::read(const boost::system::error_code & error)
{
	_socket.async_read_some(
		boost::asio::buffer(recv_buf.get()->data(), Packet::MAX_LEN),
		boost::bind(&client::handle_read,
			this,
			recv_buf,
			asio::placeholders::bytes_transferred,
			asio::placeholders::error)
		);
}

void client::handle_read(Packet::packet_ptr p, size_t byte_transfer, const boost::system::error_code & error)
{
  if (!error)
	{
		Packet::Parse(p);
	}
	_socket.async_read_some(
		boost::asio::buffer(recv_buf.get()->data(), Packet::MAX_LEN),
		boost::bind(&client::read,
			this,
			asio::placeholders::error)
		);
};

client::client(boost::asio::io_service& io_service, tcp::resolver::iterator endpoint_iterator)
	: _io_service(io_service), _socket(io_service), recv_buf(new Packet::Packet)
{
	boost::asio::async_connect(_socket, endpoint_iterator,
		boost::bind(&client::connect,
			this, boost::asio::placeholders::error)
		);
}

----------------------------------------------------------------------------------------------------------------------

int main()
{
  boost::asio::io_service io;
	boost::asio::io_service::work work(io);		//send한 후 io_service자체가 죽는것 같아 넣어줬습니다
	tcp::resolver resolver(io);
	auto endpoint_iterator = resolver.resolve({ "127.0.0.1","999" });

	std::thread t1(boost::bind(&boost::asio::io_service::run, &io));
	client c(io, endpoint_iterator);


	std::random_device rd;
  //test case 30
	for (auto i = 0; i < 30; ++i)
	{
		Packet::test t;
		unsigned int buf = rd();
		t.t = buf;
		std::cout << buf << std::endl;
		auto p = t.Make_packet();
		if (!p) {
	  	std::cout << "packet error" << std::endl;
	  	break;
		}
		c.send(p);
	}
}

코드자르다 thread join거는 부분이 잘렸네요
io_service run 해둔 쓰레드는 join걸어뒀습니다