| 15 | using boost::asio::ip::udp; |
| 16 | |
| 17 | int main(int argc, char* argv[]) |
| 18 | { |
| 19 | try |
| 20 | { |
| 21 | if (argc != 2) |
| 22 | { |
| 23 | std::cerr << "Usage: client <host>" << std::endl; |
| 24 | return 1; |
| 25 | } |
| 26 | |
| 27 | boost::asio::io_context io_context; |
| 28 | |
| 29 | udp::resolver resolver(io_context); |
| 30 | udp::endpoint receiver_endpoint = |
| 31 | *resolver.resolve(udp::v4(), argv[1], "daytime").begin(); |
| 32 | |
| 33 | udp::socket socket(io_context); |
| 34 | socket.open(udp::v4()); |
| 35 | |
| 36 | std::array<char, 1> send_buf = {{ 0 }}; |
| 37 | socket.send_to(boost::asio::buffer(send_buf), receiver_endpoint); |
| 38 | |
| 39 | std::array<char, 128> recv_buf; |
| 40 | udp::endpoint sender_endpoint; |
| 41 | size_t len = socket.receive_from( |
| 42 | boost::asio::buffer(recv_buf), sender_endpoint); |
| 43 | |
| 44 | std::cout.write(recv_buf.data(), len); |
| 45 | } |
| 46 | catch (std::exception& e) |
| 47 | { |
| 48 | std::cerr << e.what() << std::endl; |
| 49 | } |
| 50 | |
| 51 | return 0; |
| 52 | } |