使用asio创建简单udp服务demo

1.server.cpp

#include <iostream>
#include <string>
#include "boost/asio.hpp"
using namespace std;
using namespace boost::asio;
static const size_t BUF_SIZE = 1024;
int main() {
  io_service ios;
  ip::udp::socket udp_server(ios);
  ip::udp::endpoint local_addr(ip::address::from_string("127.0.0.1"), 9001);
  udp_server.open(local_addr.protocol());
  udp_server.bind(local_addr);
  char buf[BUF_SIZE] = "";
  ip::udp::endpoint send_point;
  int recv_len = 0;
  while (true) {
    recv_len = udp_server.receive_from(buffer(buf, BUF_SIZE), send_point);
    cout << "server recv size = " << recv_len << endl;
    cout << "server recv message = " << buf << endl;
    cout << "server send back size = " << udp_server.send_to(buffer(buf, recv_len), send_point) << endl;
  }

  return 0;
}

2.client.cpp

#include <iostream>
#include "boost/asio.hpp"
using namespace std;
using namespace boost::asio;
static const size_t BUF_SIZE = 1024;
int main() {
  io_service ios;
  ip::udp::socket sock(ios);
  ip::udp::endpoint end_point(ip::address::from_string("127.0.0.1"), 9001);
  sock.open(end_point.protocol());
  char buf[BUF_SIZE] = "";
  string str;
  while (true) {
    cout << "input str = ";
    cin >> str;
    try {
      cout << "client send size = " << sock.send_to(buffer(str.c_str(), str.size()), end_point) << endl;
      cout << "client recv size = " << sock.receive_from(buffer(buf, BUF_SIZE), end_point) << endl;
      cout << "client recv message = " << buf << endl;
    }
    catch (boost::system::system_error &e) {
      cerr << e.what() << endl;
    }
  }


  return 0;
}

3.make.sh

g++ -std=c++17 -g -o ServerTest server.cpp -I /opt/boost_1_69_0 -pthread
g++ -std=c++17 -g -o ClientTest client.cpp -I /opt/boost_1_69_0 -pthread