使用streambuf作为缓冲区来进行boost asio读写

Question

我正在使用此代码进行阅读

  socket_.async_read_some(boost::asio::buffer(data_, max_length),
        boost::bind(&session::handle_read, this,
        boost::asio::placeholders::error,
        boost::asio::placeholders::bytes_transferred));

这是为了写作

boost::asio::async_write(socket_,
    boost::asio::buffer(data_, bytes_transferred),
    boost::bind(&session::handle_write, this,
    boost::asio::placeholders::error));

其中socket_是socket,max_length是枚举,值为1024,data_是char数组,长度为max_length.

但我想用streambuf替换char数组缓冲区.我试过了

  boost::asio::streambuf streamBuffer;
  socket_.async_read_some(boost::asio::buffer(streamBuffer),
        boost::bind(&session::handle_read, this,
        boost::asio::placeholders::error,
        boost::asio::placeholders::bytes_transferred));

但是没有用.我该怎么做 ？

Answer 1

你需要得到一个mutable_buffers_type来自streambuf用作你的第一个参数async_read_some.

  boost::asio::streambuf streamBuffer;
  boost::asio::streambuf::mutable_buffers_type mutableBuffer =
      streamBuffer.prepare(max_length);
  socket_.async_read_some(boost::asio::buffer(mutableBuffer),
        boost::bind(&session::handle_read, this,
        boost::asio::placeholders::error,
        boost::asio::placeholders::bytes_transferred));

有关详细信息,请参阅此处和此处的asio文档.