TCP сокеты (SOCK_STREAM)

#include "stdafx.h"
#include <string.h>
#include <conio.h>
#include <stdio.h>
#include <iostream>
#include <winsock2.h>   
#pragma comment (lib, "ws2_32.lib")   
#define PORT 3985
 
     
 
  
 
using namespace System;
using namespace std;
 
int main(array<System::String ^> ^args)
{
    Console::WriteLine(L"SERVER");
    
    WORD wVersion;       
    WSADATA wsaData;        
    wVersion = MAKEWORD (2, 0);   
    SOCKET sd;  
    int wsaInitError = WSAStartup (wVersion, &wsaData);    
    if (wsaInitError != 0)
    {
        cout<<"wsaInitError: "<<WSAGetLastError()<<"\n";
        _getch();
        exit (1);
    }
    else
    {    
        sd = socket (AF_INET, SOCK_STREAM, 0);
        if (sd < 0)
        {
            cout<<"socketInitError: "<<WSAGetLastError()<<"\n";
            _getch();
            exit (1);
        }
    }
 
    char answer;
    
    struct sockaddr_in addr;
    memset (&addr, 0, sizeof (struct sockaddr_in));
  
    addr.sin_family = AF_INET;
    addr.sin_port = htons (PORT);
    addr.sin_addr.s_addr = 0;
    int serror = bind (sd, (struct sockaddr *) &addr, sizeof (struct sockaddr_in));
    if (serror != 0)
    {
        cout<<"bindError: "<<WSAGetLastError()<<"\n";
        _getch();
        exit (1);
    }
    int list = listen(sd, 20);
    struct sockaddr_in dest;
    int addrLen = sizeof(sockaddr);
    SOCKET s_a = accept(sd, (struct sockaddr *) &dest, &addrLen);
    if (s_a < 0)
    {
        cout<<"acceptError: "<<WSAGetLastError()<<"\n";
        _getch();
        exit (1);
    }
 
    int size = sizeof (struct sockaddr_in);
    int error;
    char bf;
    char buf;
 
 v: cout<<"You want send or receive(1/2)? Or exit(0)?\n"<<endl;
    answer = _getch();
    if (answer == '1')
    {
        
        cout<<"We ready! Enter message: ";
        while (buf != '0')
        {
        buf = _getch();
        cout<<buf;
        send(s_a, &buf, 1, 0);
        error = WSAGetLastError();
        if(error != 0) cout <<"errors: "<< error<<"\n";
        }
        cout <<"\n";
    }
    else if(answer == '2')
    {
        cout<<"We listen PORT #"<<PORT<<"!\n";
        while (bf != '0')
        {
        recv (s_a, &bf, 1, 0);
        cout<<bf;
        error = WSAGetLastError();
        if(error != 0) cout <<"errors: "<< error<<"\n";
        }
        cout <<"\n";
    }
    else if(answer == '0')
    {
        closesocket(s_a);
        closesocket(sd);
        WSACleanup();
        return 0;
    }
    goto v;
 
 
    return 0;
}

#include "stdafx.h"
#include <string.h>
#include <conio.h>
#include <stdio.h>
#include <iostream>
#include <winsock2.h>   
#pragma comment (lib, "ws2_32.lib")   
#define PORT 3985
 
     
 
  
 
using namespace System;
using namespace std;
 
int main(array<System::String ^> ^args)
{
    Console::WriteLine(L"CLIENT");
    
    WORD wVersion;       
    WSADATA wsaData;        
    wVersion = MAKEWORD (2, 0);   
    SOCKET sd;  
    int wsaInitError = WSAStartup (wVersion, &wsaData);    
    if (wsaInitError != 0)
    {
        cout<<"wsaInitError: "<<WSAGetLastError()<<"\n";
        _getch();
        exit (1);
    }
    else
    {    
        sd = socket (AF_INET, SOCK_STREAM, 0);
        if (sd < 0)
        {
            cout<<"socketInitError: "<<WSAGetLastError()<<"\n";
            _getch();
            exit (1);
        }
    }
 
    char answer;
    
    char ip[15];
    
 
    cout<<"Enter respondent IP: ";
    cin >> ip;
    const char * IP = ip;
 
    struct sockaddr_in addr;
    struct sockaddr_in dest;
    memset (&addr, 0, sizeof (struct sockaddr_in));
  
    addr.sin_family = AF_INET;
    addr.sin_port = htons (PORT);
    addr.sin_addr.s_addr = 0;//мой ip - 192.168.0.10
    dest.sin_family = AF_INET;
    dest.sin_port = htons (PORT);
    dest.sin_addr.s_addr = inet_addr (IP);
    int serror = connect (sd, (struct sockaddr *) &dest, sizeof (struct sockaddr_in));
    if (serror != 0)
    {
        cout<<"connectError: "<<WSAGetLastError()<<"\n";
        _getch();
        exit (1);
    }
    struct sockaddr_in addr1;
    addr1.sin_family = AF_INET;
    int size = sizeof (struct sockaddr_in);
    int error;
    char bf;
    char buf;
 
 v: cout<<"You want send or receive(1/2)? Or exit(0)?\n"<<endl;
    answer = _getch();
    if (answer == '1')
    {
        
        cout<<"We ready! Enter message: ";
        while (buf != '0')
        {
        buf = _getch();
        cout<<buf;
        send(sd, &buf, 1, 0);
        error = WSAGetLastError();
        if(error != 0) cout <<"errors: "<< error<<"\n";
        }
        cout <<"\n";
    
    }
    else if(answer == '2')
    {
        cout<<"We listen PORT #"<<PORT<<"!\n";
        while (bf != '0')
        {
        recv (sd, &bf, 1, 0);
        cout<<bf;
        error = WSAGetLastError();
        if(error != 0) cout <<"errors: "<< error<<"\n";
        }
        cout <<"\n";
    }
    else if(answer == '0')
    {
        closesocket(sd);
        WSACleanup();
        return 0;
    }
    goto v;
 
 
    return 0;
}