Difference between read_some/write_some and receive/send?
I am beginning to work with Boost Asio's TCP sockets. W开发者_如何学编程hat is the difference between read_some
and receive
and what is the difference between write_some
and send
? Thanks!
As far as I remember, read_some and receive are actually doing the same. I think receive just calls read_some or vice versa. The one naming comes from the idea of treating a socket as a file (read/write), while the other one rather comes from a connection(send /receive) point of view. Same should be true for write_some and send.
In BOOST ASIO documentation, section TCP Clients says:
Data may be read from or written to a connected TCP socket using the receive(), async_receive(), send() or async_send() member functions. However, as these could result in short writes or reads, an application will typically use the following operations instead: read(), async_read(), write() and async_write().
the same. both call this->get_service().send()
/// Send some data on the socket.
/**
* This function is used to send data on the stream socket. The function
* call will block until one or more bytes of the data has been sent
* successfully, or an until error occurs.
*
* @param buffers One or more data buffers to be sent on the socket.
*
* @returns The number of bytes sent.
*
* @throws boost::system::system_error Thrown on failure.
*
* @note The send operation may not transmit all of the data to the peer.
* Consider using the @ref write function if you need to ensure that all data
* is written before the blocking operation completes.
*
* @par Example
* To send a single data buffer use the @ref buffer function as follows:
* @code
* socket.send(boost::asio::buffer(data, size));
* @endcode
* See the @ref buffer documentation for information on sending multiple
* buffers in one go, and how to use it with arrays, boost::array or
* std::vector.
*/
template <typename ConstBufferSequence>
std::size_t send(const ConstBufferSequence& buffers)
{
boost::system::error_code ec;
std::size_t s = this->get_service().send(
this->get_implementation(), buffers, 0, ec);
boost::asio::detail::throw_error(ec, "send");
return s;
}
////////////////////////////////////////////
template <typename ConstBufferSequence>
std::size_t write_some(const ConstBufferSequence& buffers)
{
boost::system::error_code ec;
std::size_t s = this->get_service().send(
this->get_implementation(), buffers, 0, ec);
boost::asio::detail::throw_error(ec, "write_some");
return s;
}
from basic_stream_socket.hpp
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