Hello,
Looking at the asio.sourceforge.net library, I found a tutorial to develop simple client and server programs. Below I am pasting the client and the server. On my Fedora Core 4, I can compile the two programs(client is 'a' and server is 'daytime', but I have no idea on how to test them...
./a
returns
Usage: client <host>
while
./daytime
returns
Permission denied
What should I do to make the two programs talk to each other? I am sure it is pretty basic here but I cannot seem to figure it out. I am posting on this forum because it looks to me that this is more a unix question than an asio one.
thanks in advance
Regards,
SERVER
#include <ctime>
#include <iostream>
#include <string>
#include <boost/asio.hpp>
using boost::asio::ip::tcp;
std::string make_daytime_string()
{
using namespace std; // For time_t, time and ctime;
time_t now = time(0);
return ctime(&now);
}
int main()
{
try
{
boost::asio::io_service io_service;
tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 13));
for (;;)
{
tcp::socket socket(io_service);
acceptor.accept(socket);
std::string message = make_daytime_string();
boost::asio::write(socket, boost::asio::buffer(message),
boost::asio::transfer_all(), boost::asio::ignore_error());
}
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}
CLIENT
#include <iostream>
#include <boost/array.hpp>
#include <boost/asio.hpp>
using boost::asio::ip::tcp;
int main(int argc, char* argv[])
{
try
{
if (argc != 2)
{
std::cerr << "Usage: client <host>" << std::endl;
return 1;
}
boost::asio::io_service io_service;
tcp::resolver resolver(io_service);
tcp::resolver::query query(argv[1], "daytime");
tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
tcp::resolver::iterator end;
tcp::socket socket(io_service);
boost::asio::error error = boost::asio::error::host_not_found;
while (error && endpoint_iterator != end)
{
socket.close();
socket.connect(*endpoint_iterator++, boost::asio::assign_error(error));
}
if (error)
throw error;
for (;;)
{
boost::array<char, 128> buf;
boost::asio::error error;
size_t len = socket.read_some(
boost::asio::buffer(buf), boost::asio::assign_error(error));
if (error == boost::asio::error::eof)
break; // Connection closed cleanly by peer.
else if (error)
throw error; // Some other error.
std::cout.write(buf.data(), len);
}
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}