处理粘包

run()

{

boost::asio::async_read(m_socket,
        boost::asio::buffer(m_buffer, head_size),
        boost::bind(&ThreadedSafeClient::handle_read_header, shared_from_this(),
        boost::asio::placeholders::error, m_buffer, head_size));

}

handle_read_header（）

{

         //处理头数据，获得负载长度

boost::asio::async_read(m_socket,
            boost::asio::buffer(m_buffer + NET_BUFF_HEAD_SIZE, body_size),
            boost::bind(&ThreadedSafeClient::handle_read_body, shared_from_this(),
            boost::asio::placeholders::error, pdu_name, m_buffer + NET_BUFF_HEAD_SIZE, body_size))

}

handle_read_body()

{

   boost::asio::async_read(m_socket,
            boost::asio::buffer(m_buffer, NET_BUFF_HEAD_SIZE),
            boost::bind(&ThreadedSafeClient::handle_read_header, shared_from_this(),
            boost::asio::placeholders::error, m_buffer, NET_BUFF_HEAD_SIZE));

}