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This tutorial program shows how to use asio to implement a server application with UDP.
int main() { try { boost::asio::io_service io_service;
Create an boost::asio::ip::udp::socket object to receive requests on UDP port 13.
udp::socket socket(io_service, udp::endpoint(udp::v4(), 13));
Wait for a client to initiate contact with us. The remote_endpoint object will be populated by boost::asio::ip::udp::socket::receive_from().
for (;;)
{
boost::array<char, 1> recv_buf;
udp::endpoint remote_endpoint;
boost::system::error_code error;
socket.receive_from(boost::asio::buffer(recv_buf),
remote_endpoint, 0, error);
if (error && error != boost::asio::error::message_size)
throw boost::system::system_error(error);
Determine what we are going to send back to the client.
std::string message = make_daytime_string();
Send the response to the remote_endpoint.
boost::system::error_code ignored_error;
socket.send_to(boost::asio::buffer(message),
remote_endpoint, 0, ignored_error);
}
}
Finally, handle any exceptions.
catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; }
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