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POHow to bind the local endpoint to a socket?
 

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  1. POHow to bind the local endpoint to a socket?
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    <p>I have the following code where I'm trying to send a packet to a specific client by changing the endpoint of the socket manually and I'm not sure how to configure the socket to use the <code>async_write</code> function to send the packet. Lines 44-47 are used to try solving the problem within the boost async server example (modified).</p> <pre><code>#include &lt;cstdlib&gt; #include &lt;iostream&gt; #include &lt;boost/bind.hpp&gt; #include &lt;boost/asio.hpp&gt; using boost::asio::ip::tcp; class session { public: session(boost::asio::io_service&amp; io_service) : socket_(io_service) { } tcp::socket&amp; socket() { return socket_; } void start() { std::cout&lt;&lt;"start(): "&lt;&lt;std::endl; socket_.async_read_some(boost::asio::buffer(data_, max_length), boost::bind(&amp;session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void read_handler(const boost::system::error_code&amp; ec, std::size_t bytes_transferred); private: void handle_read(const boost::system::error_code&amp; error, size_t bytes_transferred) { std::cout&lt;&lt;"handle read: bytes_transferred"&lt;&lt;bytes_transferred&lt;&lt;std::endl; if (!error) { data_ = {'0','1','2','3','4','5','6','7','8','9'}; /*read_handler(error, bytes_transferred); boost::asio::async_write(socket_,boost::asio::buffer(data_, bytes_transferred), boost::bind(&amp;session::handle_write, this, boost::asio::placeholders::error));*/ boost::system::error_code ec; boost::asio::ip::tcp::endpoint endpoint = socket_.remote_endpoint(ec); std::cout&lt;&lt;"ip address: "&lt;&lt;endpoint.address()&lt;&lt;std::endl; std::cout&lt;&lt;"port: "&lt;&lt;endpoint.port()&lt;&lt;std::endl; //how to get the socket to send data to specific port, ip-address e.g. changing the ip-address and port by editing it? async_write(socket_, boost::asio::buffer(data_, max_length), boost::bind(&amp;session::writeHandler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } else { delete this; } } void writeHandler(const boost::system::error_code&amp; errorCode, size_t bytesTransferred) { std::cout &lt;&lt; "DEBUG&gt; Transfered " &lt;&lt; bytesTransferred &lt;&lt; " bytes to " &lt;&lt; socket_.remote_endpoint().address().to_string() &lt;&lt; std::endl; } void handle_write(const boost::system::error_code&amp; error) { std::cout&lt;&lt;"handle write: "&lt;&lt;std::endl; if (!error) { std::cout&lt;&lt;"before: "&lt;&lt;data_&lt;&lt;std::endl; socket_.async_read_some(boost::asio::buffer(data_, max_length), boost::bind(&amp;session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); std::cout&lt;&lt;"after: "&lt;&lt;data_&lt;&lt;std::endl; } else { delete this; } } tcp::socket socket_; enum { max_length = 1024 }; char data_[max_length]; }; void session::read_handler(const boost::system::error_code&amp; ec, std::size_t bytes_transferred) { std::cout&lt;&lt;bytes_transferred&lt;&lt;std::endl; } class server { public: server(boost::asio::io_service&amp; io_service, short port) : io_service_(io_service), acceptor_(io_service, tcp::endpoint(tcp::v4(), port)) { start_accept(); } private: void start_accept() { session* new_session = new session(io_service_); acceptor_.async_accept(new_session-&gt;socket(), boost::bind(&amp;server::handle_accept, this, new_session, boost::asio::placeholders::error)); } void handle_accept(session* new_session, const boost::system::error_code&amp; error) { if (!error) { new_session-&gt;start(); } else { delete new_session; } start_accept(); } boost::asio::io_service&amp; io_service_; tcp::acceptor acceptor_; }; int main() { try { boost::asio::io_service io_service; server s(io_service, 4000); io_service.run(); } catch (std::exception&amp; e) { std::cerr &lt;&lt; "Exception: " &lt;&lt; e.what() &lt;&lt; "\n"; } return 0; } </code></pre>
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