Old snippet from the beginning.

winsockserver.cpp

#include <iostream>
#include <winsock.h>
#define PORT 7096
#pragma comment(lib, "wsock32.lib")
int main(void)
{
          std::cout << "Start of program." << std::endl;

          WORD wVersion = MAKEWORD(1, 1);
          WSADATA wsaData;
          int eid;
          eid = WSAStartup(wVersion, &wsaData);
          if (eid != 0)
                  {
                            std::cout << "WSAStartup failed: " << WSAGetLastError() << std::endl;
                            std::cin.get();
                            return 1;
                          }
          SOCKET server;
          if ((server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
                  {
                            std::cout << "Error creating file descriptor: " << WSAGetLastError() << std::endl;
                            WSACleanup();
                            std::cin.get();
                            return 1;
                          }
          struct sockaddr_in s;
          memset(&s, 0, sizeof s);
          s.sin_family = AF_INET;
          s.sin_port = htons(PORT);
          s.sin_addr.s_addr = htonl(INADDR_ANY);
          if (bind(server, (struct sockaddr *) &s, sizeof s) == SOCKET_ERROR)
                  {
                            std::cout << "Error binding to local port: " << WSAGetLastError() << std::endl;
                            WSACleanup();
                            std::cin.get();
                            return 1;
                          }

          if (listen(server, SOMAXCONN) < 0)
                  {
                            std::cout << "Error listening on local port: " << WSAGetLastError() << std::endl;
                            WSACleanup();
                            std::cin.get();
                            return 1;
                          }
          std::cout << "Listening on local port: " << PORT << std::endl;
          SOCKET client;
          struct sockaddr_in c;
          int len;
          len = sizeof c;
         
          if ((client = accept(server, (struct sockaddr *) &c, &len)) < 0) 
                  {
                            std::cout << "Error accepting client: " << WSAGetLastError() << std::endl;
                            WSACleanup();
                            std::cin.get();
                            return 1;
                          }
          struct sockaddr_in a;
          len = sizeof a;
          eid = getpeername(client, (struct sockaddr *) &a, &len);
          if (eid < 0)
                  {
                            std::cout << "Error retrieving client numeric: " << WSAGetLastError() << std::endl;
                            WSACleanup();
                            std::cin.get();
                            return 1;
                          }
         
          std::cout << "Connection received from: " << inet_ntoa(c.sin_addr) << std::endl;
          closesocket(client);
         
          std::cout << "End of program." << std::endl;
          WSACleanup();
          std::cin.get();
          return 0;
}