server

//сервер
#include "stdafx.h"
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <iostream>
#include <stdlib.h>
#pragma comment(lib, "ws2_32.lib")
using namespace std;
int numcl = 0;
DWORD WINAPI ThreadFunc(LPVOID client_socket)
{
    struct Spisok
    {
        char Name[100];
        int Grade;
        int Experience;
        char Subject[100];
    };
    Spisok Teacher[10];

    strcpy(Teacher[0].Name, "Smirnov\n\0");
    Teacher[0].Grade =1;
    Teacher[0].Experience = 3;
    strcpy(Teacher[0].Subject, "Matematika\n\0");
    strcpy(Teacher[1].Name, "Petrov\n\0");
    Teacher[1].Grade = 2;
    Teacher[1].Experience = 4;
    strcpy(Teacher[1].Subject, "Physika\n\0");
    strcpy(Teacher[2].Name, "Ivanov\n\0");
    Teacher[2].Grade = 3;
    Teacher[2].Experience = 5;
    strcpy(Teacher[2].Subject, "Russkiy\n\0");
    strcpy(Teacher[3].Name , "Sidorov\n\0");
    Teacher[3].Grade = 3;
    Teacher[3].Experience =6;
    strcpy(Teacher[3].Subject , "Matematika\n\0");
    strcpy(Teacher[4].Name , "Zaytcev\n\0");
    Teacher[4].Grade = 1;
    Teacher[4].Experience = 3;
    strcpy(Teacher[4].Subject , "Physika\n\0");
    strcpy(Teacher[5].Name , "Glazov\n\0");
    Teacher[5].Grade = 2;
    Teacher[5].Experience = 4;
    strcpy(Teacher[5].Subject , "Russkiy\n\0");
    strcpy(Teacher[6].Name , "Medvedev\n\0");
    Teacher[6].Grade = 3;
    Teacher[6].Experience = 5;
    strcpy(Teacher[6].Subject , "Matematika\n\0");
    strcpy(Teacher[7].Name , "Vasil'ev\n\0");
    Teacher[7].Grade = 4;
    Teacher[7].Experience = 6;
    strcpy(Teacher[7].Subject , "Physika\n\0");
    strcpy(Teacher[8].Name , "Sokolov\n\0");
    Teacher[8].Grade = 1;
    Teacher[8].Experience = 3;
    strcpy(Teacher[8].Subject , "Russkiy\n\0");
    strcpy(Teacher[9].Name , "Rybakov\n\0");
    Teacher[9].Grade =2;
    Teacher[9].Experience = 4;
    strcpy(Teacher[9].Subject , "Matematika\n\0");

    SOCKET s2 = ((SOCKET *)client_socket)[0];
    char buf[100]="";
    char buf1[100]="";
    int recvbytes;
    while (recvbytes=recv(s2, buf, sizeof(buf), 0))
    {
        if (recvbytes == SOCKET_ERROR)
            break;
        int i;

        for (i = 0; i < 10; i++)
        {
            if (strcmp(Teacher[i].Subject, buf) == 0 && Teacher[i].Experience >= 5)
            {

            strcat(buf1, Teacher[i].Name);
            }
        }

        if (strlen(buf1) == 0)
            strcat(buf1, "-1");

        strcpy(buf, buf1);
        cout << buf << endl;
        send(s2, buf, 100, 0);
    }
    closesocket(s2);
    numcl--;
    return 0;
}
void print()
{
    if (numcl) printf("%d clients connected\n", numcl);
    else printf("No clients connected\n");
}
void main()
{
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD(2, 2);
    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0) { return; }
    SOCKET s = socket(AF_INET, SOCK_STREAM, 0);
    sockaddr_in local_addr;
    local_addr.sin_family = AF_INET;
    local_addr.sin_port = htons(1280);
    local_addr.sin_addr.s_addr = 0;
    bind(s, (sockaddr *)&local_addr, sizeof(local_addr));
    int c = listen(s, 5);
    cout << "Server receive ready" << endl;
    cout << endl;
    // извлекаем сообщение из очереди
    SOCKET client_socket; // сокет для клиента
    sockaddr_in client_addr; // адрес клиента (заполняется системой)
    int client_addr_size = sizeof(client_addr);
    // цикл извлечения запросов на подключение из очереди
    while ((client_socket = accept(s, (sockaddr *)&client_addr, &client_addr_size)))
    {
        numcl++;
        print();
        // Вызов нового потока для обслуживания клиента
        DWORD thID;// thID идентификатор типа DWORD
        CreateThread(NULL, NULL, ThreadFunc, &client_socket, NULL, &thID);
    }
}