Client

#include <iostream>
#include <winsock2.h>

int main() {
    WADATA wsaData;

    int result = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (NO_ERROR != result){
        std::cout<<"Initialization Error\n";
    }

    SOCKET mainSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (INVALID_SOCKET == mainSocket){
        std::cout<<"ERR: socket not created\n";
        WSACleanup();
        return 1;
    }

    sockaddr_in service;
    memset(&service, 0, sizeof(service));
    service.sin_family = AF_INET;
    service.addr.s_addr = inet_addr("127.0.0.1");
    service.sin_port = htons(27015);

    if(SOCKET_ERROR == bind(mainSocket, (SOCKADDR*) &service, sizeof(service))){
        std::cout<<"ERR: bind() failed. \n";
        closesocket(mainSocket);
        return 1;
    }

    if(SOCKET_ERROR == listen(mainSocket, 1)){
        std::cout<<"ERR: listening to socket failed. \n";
    }

    SOCKET acceptSocket = SOCKET_ERROR;
    std::cout<<"INFO: Waiting for a client to connect. \n";

    while(SOCKET_ERROR == acceptSocket){
        acceptSocket = accept(mainSocket, NULL, NULL);
    }
    std::cout<<"INFO: Client connected. \n";
    mainSocket = acceptSocket;
}