Getting basic UDP example working? #59
Description
Hi,
Not really an issue but I am a newbie c++ programmer trying to get a very basic UDP communication example working. I am running echo_server.cpp on 1 computer and echo_client_conn.cpp on another computer. I am getting
input: Error while reading! (Connection refused)
when I run the client program. The server program doesn't seem to be giving error. Can you help me diagnose what is the issue? I did not change anything besides the host value. Also ping to the server from client works. Thanks!
# include <iostream>
# include "../headers/inetserverdgram.hpp"
# include "../headers/exception.hpp"
# include <cstring>
// Server for echo_client_*.cpp
// simply receives a message and sends an answer.
int main(void)
{
using std::string;
string host = "192.168.0.111"; //ip address of server computer
string port = "1234";
string answer("Hello back from the server!");
string from;
string fromport;
string buf;
buf.resize(32);
try {
libsocket::inet_dgram_server srv(host,port,LIBSOCKET_BOTH);
for (;;)
{
srv.rcvfrom(buf,from,fromport);
std::cout << "Datagram from " << from << ":" << fromport << " " << buf << std::endl;
srv.sndto(answer,from,fromport);
}
srv.destroy();
} catch (const libsocket::socket_exception& exc)
{
std::cerr << exc.mesg;
}
return 0;
}
client code
# include <iostream>
# include <unistd.h>
# include "../headers/inetclientdgram.hpp"
# include "../headers/exception.hpp"
/*
* Sends and receives messages via connected UDP sockets
*/
int main(void)
{
using std::string;
string host = "192.168.0.111";//also put address of server here?
string port = "1234";
string answer;
answer.resize(32);
libsocket::inet_dgram_client sock(LIBSOCKET_IPv4);
try {
std::cout << sock.gethost();
} catch (const libsocket::socket_exception& exc)
{
std::cerr << exc.mesg;
}
try {
for ( int i = 0; i < 20; i++ )
{
sock.connect(host,port);
sock << "Hello, server";
sock >> answer;
std::cout << "Answer from server: " << answer << std::endl;
sock.deconnect();
}
} catch ( const libsocket::socket_exception& exc )
{
std::cerr << exc.mesg;
}
sock.destroy();
return 0;
}