udpDirectChat.cc

Example of UDP non-blocking Socket

#include <iostream>
#include <sstream>
#include <string>
#include <string.h>

using namespace std;

#include <netlink/socket.h>


unsigned getUnsigned(char* input) {

        stringstream ss;
        ss << input;
        unsigned result;
        ss >> result;

        return result;
}


int main(int argc, char *argv[]) {

        if (argc < 4){
                cout << "\n Use:\n\t" << argv[0] << " localPort remoteHost remotePort\n";
                return 0; 
        }

        NL::init();

        unsigned localPort = getUnsigned(argv[1]);
        unsigned remotePort = getUnsigned(argv[3]);     
        string remoteHost(argv[2]);
                
        cout << "\nStarting UDP Connection...";
        cout.flush();
        try {
                NL::Socket socket(remoteHost, remotePort, localPort);
                socket.blocking(false);

        
                char buffer[256];
                buffer[255] = '\0';

                while(true) {

                        cout << "\n--> ";
                        cin.getline(buffer, 255);
                        socket.sendTo(buffer, strlen(buffer)+1, remoteHost, remotePort);
                        if(!strcmp(buffer, "exit"))
                                break;

                        string remoteHost;
                        unsigned remotePort;            

                        if(socket.readFrom(buffer, 255, &remoteHost, &remotePort) != -1)
                                cout << "\nRcv From " << remoteHost << ":" << remotePort << ". Text: " << buffer;
                }

                cout << "\nEnd";
        }

        catch(NL::Exception e) {

                cout << "***ERROR*** " << e.what();
                return 0;
        }


}