LV4 - Client

#include <iostream>
#include <string>
#include <WS2tcpip.h>
#include <sstream>
#include <Windows.h>

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

int main()
{
    std::string ipAddress = "127.0.0.1";            // IP Address of the server
    int port = 54000;                       // Listening port # on the server

    WSAData data;
    WORD ver = MAKEWORD(2, 2);
    int wsResult = WSAStartup(ver, &data);
    if (wsResult != 0)
    {
        std::cerr << "Can't start winsock, Error #" << wsResult << std::endl;
        return -1;
    }

    SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == INVALID_SOCKET)
    {
        std::cerr << "Can't create socket, Error #" << WSAGetLastError() << std::endl;
        WSACleanup();
        return -2;
    }

    sockaddr_in hint;
    hint.sin_family = AF_INET;
    hint.sin_port = htons(port);
    inet_pton(AF_INET, ipAddress.c_str(), &hint.sin_addr);

    int connResult = connect(sock, (sockaddr*)&hint, sizeof(hint));
    if (connResult == SOCKET_ERROR)
    {
        std::cerr << "Can't connect to server, Err #" << WSAGetLastError() << std::endl;
        closesocket(sock);
    }

    char buf[4096];

    std::cout << "Socket name: " << sock << std::endl;

    std::ostringstream socketNameStream;
    socketNameStream << "N" << sock << "\r\n";
    std::string socketName = socketNameStream.str();

    int sendResult = send(sock, socketName.c_str(), socketName.size() + 1, 0);
    if (sendResult != SOCKET_ERROR)
    {
        ZeroMemory(buf, 4096);
        int bytesreceived = recv(sock, buf, 4096, 0);
        if (bytesreceived > 0)
        {
            std::cout << "SERVER> " << std::string(buf, 0, bytesreceived) << std::endl;
        }
    }

    while (true) {
        ZeroMemory(buf, 4096);
        int bytesReceived = recv(sock, buf, 4096, 0);
        if (bytesReceived > 0)
        {
            std::cout << "SERVER> " << std::string(buf, 0, bytesReceived) << std::endl;

            if (buf[0] == 'P') {

                std::string okMsg = "OK";
                send(sock, okMsg.c_str(), okMsg.size() + 1, 0);
                Sleep(100);
                closesocket(sock);
                WSACleanup();
            }
        }
    }

    closesocket(sock);
    WSACleanup();

    system("pause");
    return 0;
}