I get the following error message when I'm trying to use std::string with boost::asio::buffer:
boost/asio/detail/consuming_buffers.hpp:
In constructor
'boost::asio::detail::consuming_buffers<
boost::asio::mutable_buffer, boost::asio::const_buffers_1
>::consuming_buffers(const boost::asio::const_buffers_1 &)':
boost/asio/impl/read.hpp:140:25:
instantiated from
'boost::asio::detail::read_op<
boost::asio::basic_stream_socket<boost::asio::ip::tcp>,
boost::asio::const_buffers_1
, boost::asio::detail::transfer_all_t
, boost::_bi::bind_t<
void, boost::_mfi::mf1<void, read_op, const
boost::system::error_code &>
, boost::_bi::list2<boost::_bi::value<read_op
*>, boost::arg<1> (*)()>
>
>::read_op(
boost::asio::basic_stream_socket<boost::asio::ip::tcp>
&, const boost::asio::const_buffers_1
&
, boost::asio::detail::transfer_all_t
, boost::_bi::bind_t<
void, boost::_mfi::mf1<void, read_op, const
boost::system::error_code &>
, boost::_bi::list2<boost::_bi::value<read_op
*>, boost::arg<1> (*)()>
>
)'
[...]
Full source code: http://liveworkspace.org/code/eca749f6f2714b7c3c4df9f26a404d86
I think the problem is that you are passing a const buffer to async_read
instead of a mutable buffer. In the block ending in line 50, boost::asio::buffer(_header)
returns a const buffer. You should do something like boost::asio::async_read(s, boost::asio::buffer(data, size), handler)
, because boost::asio::buffer(data, size)
creates a mutable buffer.
Instead of using std::string
s for _header and _data, you probably need to use arrays of char, such as:
char* _data;
boost::asio::buffer(_data, strlen(_data));
See reference documentations for buffer
and async_read
.
You must pass a pointer as the first parameter:
#include <string>
#include <boost/asio.hpp>
std::string request, reply;
auto rsize = boost::asio::buffer(&reply[0], request.size());
From the boost::asio::buffer
reference documentation:
It seems that std::string
could only be passed into an asio::buffer
as a const reference.
std::vector<char>
should be a better alternative:
std::vector<char> d2(128);
bytes_transferred = sock.receive(boost::asio::buffer(d2));
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