Server

#include <iostream>
#include <fstream>

#include <WinSock2.h>
#include <WS2tcpip.h>
#include <stdio.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")


#define PORT_NUMBER 1337
#define BUFFER_LENGTH 500


int ShowError();
void SendMessageToClient(SOCKET soc, char* msg);

int main()
{

    WSADATA wsaData;

    int Result;

    Result = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (Result != 0)
    {
        WSACleanup();
        return ShowError();
    }

    SOCKET ListenSocket = INVALID_SOCKET;

    ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (ListenSocket == INVALID_SOCKET)
    {
        WSACleanup();
        return ShowError();
    }

    SOCKADDR_IN ServerInfo;

    ServerInfo.sin_port = htons(PORT_NUMBER);
    ServerInfo.sin_family = AF_INET;
    ServerInfo.sin_addr.s_addr = ADDR_ANY;

    //bind socket

    Result = bind(ListenSocket, (SOCKADDR*)&ServerInfo, sizeof(ServerInfo));

    if (Result == SOCKET_ERROR)
    {
        WSACleanup();
        return ShowError();
    }

    listen(ListenSocket, 1); //only waiting for 1 client

    SOCKET tempSock = INVALID_SOCKET;

    while (tempSock == INVALID_SOCKET)
    {
        cout << "Waiting for incoming connections..\n";

        tempSock = accept(ListenSocket, 0, 0);
    }


    cout << "\nClient Connected!\n";


    SendMessageToClient(tempSock, "Test message\n");
    Sleep(10);
    SendMessageToClient(tempSock, "Another message!\n");

    shutdown(ListenSocket, SD_SEND);
    closesocket(ListenSocket);

    WSACleanup();

    system("PAUSE > NUL");

    return 0;
}


void SendMessageToClient(SOCKET soc, char* msg)
{

    int bSend = send(soc, msg, (int)strlen(msg), 0);

    printf("\n\nBytes Sent: %d\n\n", bSend);
}

int ShowError()
{
    MessageBox(NULL, "An error occured.", 0, 0);
    return 1;
}