source: network-game/client/Client/main.cpp@ aee34b9

/* UDP client in the internet domain */
#include <sys/types.h>

#include <winsock2.h>
#include <WS2tcpip.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <iostream>

#include <boost/lambda/lambda.hpp>

#include "../../common/message.h"

#pragma comment(lib, "ws2_32.lib")

using namespace std;

void error(const char *);

int boost_main()
{
    using namespace boost::lambda;
    typedef istream_iterator<int> in;

    for_each(in(cin), in(), cout << (_1 * 3) << " " );

        return 0;
}

int main(int argc, char *argv[])
{
        int sock, n;
        struct sockaddr_in server, from;
        struct hostent *hp;
        char buffer[256];

        if (argc != 3) {
                cout << "Usage: server port" << endl;
                exit(1);
        }

        WORD wVersionRequested;
        WSADATA wsaData;
        int wsaerr;

        wVersionRequested = MAKEWORD(2, 2);
        wsaerr = WSAStartup(wVersionRequested, &wsaData);
        
        if (wsaerr != 0) {
                cout << "The Winsock dll not found." << endl;
                exit(1);
        }else
                cout << "The Winsock dll was found." << endl;
        
        sock= socket(AF_INET, SOCK_DGRAM, 0);
        if (sock < 0)
                error("socket");

        server.sin_family = AF_INET;
        hp = gethostbyname(argv[1]);
        if (hp==0)
                error("Unknown host");

        memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);
        server.sin_port = htons(atoi(argv[2]));
        cout << "Please enter the message: ";
        memset(buffer, 0, 256);
        fgets(buffer,255,stdin);

        socklen_t fromlen = sizeof(server);

        n=sendto(sock,buffer, strlen(buffer), 0, (const struct sockaddr *)&server, fromlen);
        if (n < 0)
                error("Sendto");

        n = recvfrom(sock, buffer, 256, 0, (struct sockaddr *)&from, &fromlen);
        if (n < 0)
                error("recvfrom");
        
        buffer[n] = '\0';
        cout << "Got an ack: " << endl;
        cout << buffer << endl;

        closesocket(sock);

        WSACleanup();

        return 0;
}

/*
int sendMessage(short type, string contents, int sock, struct sockaddr_in *dest)
{
        NETWORK_MSG msg;

        msg.type = type;
        strcpy(msg.buffer, contents.c_str());

        return sendto(sock, (char*)&msg, sizeof(NETWORK_MSG), 0, (struct sockaddr *)dest, sizeof(dest));
}
*/

void error(const char *msg)
{
    perror(msg);
        WSACleanup();
    exit(1);
}