服务器和客户端简单的使用select网络模型（二）

此版本在之前一的基础上进行了封装

Server部分：一共3个文件（server.cpp,EasyTcpServer.hpp和MessageHeader.hpp）

server.cpp：

#include"EasyTcpServer.hpp"
#include<thread>

void CmdThread(EsayTcpServer *server)
{
    while (true)
    {
        char cmdBuf[256] = {};
        scanf("%s", cmdBuf);

        if (0 == strcmp(cmdBuf, "exit")) {

            server->Close();
            printf("退出cmdThread线程\n");
            break;
        }
        else
            printf("不支持的命令。 \n");
    }
}

int main()
{
    EsayTcpServer server;
    server.initSocket();
    server.Bind(nullptr,10000);
    server.Listen(5);
    std::thread t1(CmdThread, &server);
    t1.detach();
    while (server.isRun())
    {
        server.OnRun();
    }
    
    return 0;
}

EasyTcpServer.hpp：

#ifndef _EASY_TCP_SERVER_HPP_
#define _EASY_TCP_SERVER_HPP_
#define _AFXDLL
#ifdef _WIN32
    #include"afx.h"
    #include<windows.h>
    #include "WinSock2.h"
#else
    #include<unistd.h>
    #include<arpa/inet.h>
    #include<string.h>

    #define SOCKET int
    #define INVALID_SOCKET  (SOCKET)(~0)
    #define SOCKET_ERROR            (-1)
#endif
#include<iostream>
#include<vector>
#include<stdlib.h>


#include"MessageHeader.hpp"


class EsayTcpServer
{
public:
    SOCKET _sock;
    std::vector<SOCKET> g_clients;
public:
    EsayTcpServer()
    {
        _sock = INVALID_SOCKET;
    }
    virtual ~EsayTcpServer()
    {
        Close();
    }

    //初始化Socket
    SOCKET initSocket()
    {
        // 启动Windows socket 2.x环境
#ifdef _WIN32
        WORD ver = MAKEWORD(2, 2);
        WSADATA dat;

        WSAStartup(ver, &dat);
#endif
        //----------------
        // 建立一个socket
        if (INVALID_SOCKET != _sock)
        {
            printf("<sock=%d>关闭之前的连接...\n", _sock);
            Close();
        }
        _sock = socket(AF_INET, SOCK_STREAM, 0);

        if (INVALID_SOCKET == _sock)
            printf("错误,创建Socket失败...\n");
        else
            printf("建立Socket成功...\n");
        return _sock;
    }
    //绑定端口
    int Bind(const char *ip,unsigned short port)
    {
        sockaddr_in sin = {};
        sin.sin_family = AF_INET;
        sin.sin_port = htons(port);    //host to net unsigned short

#ifdef _WIN32
        if(ip!=NULL)
        {
            sin.sin_addr.S_un.S_addr = inet_addr(ip);
        }
        else
        {
            sin.sin_addr.S_un.S_addr = INADDR_ANY;     //本机上的外网和局域网ip任意一个拿来用 
        }
         
#else
        if (ip!=NULL)
        {
            sin.sin_addr.s_addr = inet_addr(ip);     //本机上的外网和局域网ip任意一个拿来用
        }
        else
        {
            sin.sin_addr.s_addr = INADDR_ANY;     //本机上的外网和局域网ip任意一个拿来用 
        }
        
#endif
        //2绑定
        if (SOCKET_ERROR == bind(_sock, (sockaddr *)&sin, sizeof(sockaddr_in)))
        {
            //TRACE(_T("ERROR:绑定socket失败\n"));
            return 0;
        }
    
    
    }
    //监听端口
    int Listen(int n)
    {
        int ret = listen(_sock, n);
        if (SOCKET_ERROR == ret)
        {
            TRACE(_T("ERROR:socket监听失败"));
        }
        else
        {
            printf("监听开始\n");
        }
        return ret;
    }
    //接受客户端连接
    SOCKET Accept()
    {
        //4接收客户端连接
        SOCKET _cSock = INVALID_SOCKET;
        sockaddr_in clientAddr = {};
        int nAddrLen = sizeof(sockaddr_in);
        _cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
        if (INVALID_SOCKET == _cSock)
        {
            printf("接收客户端无效\n");
        }
        else
        {
            //广播所有客户端，新加入一个新的客户端
            NewUserJoin newUser;
            SendDataToAll(&newUser);

            g_clients.push_back(_cSock);
            printf("新客户端加入socket = %d,ip:%s\n", _cSock, inet_ntoa(clientAddr.sin_addr));
        }
        return _cSock;
    }
    //关闭socket
    void Close()
    {
        if (_sock != INVALID_SOCKET) {
#ifdef _WIN32
            closesocket(_sock);
            WSACleanup();
#else
            close(_sock);
#endif
            _sock = INVALID_SOCKET;
        }
    }
    //处理网络消息
    bool OnRun()
    {
        fd_set fdRead;
        fd_set fdWrite;
        fd_set fdExp;
        FD_ZERO(&fdRead);
        FD_ZERO(&fdWrite);
        FD_ZERO(&fdExp);

        //将要监听的socket添加到数组
        FD_SET(_sock, &fdRead);
        FD_SET(_sock, &fdWrite);
        FD_SET(_sock, &fdExp);

        SOCKET maxSock = _sock;
        //每次进来都把所有要监视的socket添加到相应的数组中
        for (std::vector<SOCKET>::iterator it = g_clients.begin(); it != g_clients.end(); it++)
        {
            FD_SET(*it, &fdRead);
            if (maxSock < *it)
            {
                maxSock = *it;
            }
        }

        //开始查询，会清空3个数组所有的socket，然后如果哪个socket有事件发送，则会把此socket放入到数组返回
        //当有客户端连接或者客户端发送消息都会进来
        timeval time = { 2, 0 };
        /*int select(
        IN int nfds, //windows下无意义，linux有意义IN OUT fd_set* readfds,      //检查可读性
        IN OUT fd_set* writefds,    //检查可写性
        IN OUT fd_set* exceptfds,  //例外数据
        IN const struct timeval* timeout);  //函数的返回时间*/
        int ret = select(maxSock + 1, &fdRead, &fdWrite, &fdExp, NULL);
        printf("空闲时间处理其他事情\n");
        if (ret < 0)
        {
            printf("select任务结束\n");
            Close();
            return false;
        }
        if (FD_ISSET(_sock, &fdRead))
        {
            FD_CLR(_sock, &fdRead);
            //4接收客户端连接
            Accept();
        }

        for (size_t n = 0; n < fdRead.fd_count; n++)
        {
            if (-1 == RecvData(fdRead.fd_array[n]))
            {
                auto iter = find(g_clients.begin(), g_clients.end(), fdRead.fd_array[n]);
                if (iter != g_clients.end())
                {
                    g_clients.erase(iter);
                }
            }
        }
    }
    //是否在工作中
    bool isRun()
    {
        return _sock != INVALID_SOCKET;
    }
    // 接受数据，处理粘包，拆分包
    int RecvData(SOCKET cSock)
    {
        char szRecv[1024] = {};
        //接受客户端请求数据
        int nLen = recv(cSock, szRecv, sizeof(DataHeader), 0);
        DataHeader *header = (DataHeader*)szRecv;
        if (nLen <= 0)
        {
            printf("客户端<socket=%d>已退出，任务结束\n", cSock);
            return -1;
        }
        printf("收到命令：%d  数据长度：%d\n", header->cmd, header->dataLength);
        recv(cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
        OnNetMsg(cSock, header);
        return 0;
    }
    // 响应网络消息
    virtual void OnNetMsg(SOCKET _cSock, DataHeader* header)
    {
        switch (header->cmd)
        {
        case CMD_LOGIN:
        {
            Login* login = (Login*)header;
            printf("收到命令  用户名：%s密码%s\n", login->userName, login->PassWord);
            LoginResult ret = {};
            ret.result = 0;
            send(_cSock, (const char *)&ret, sizeof(LoginResult), 0);
            break;
        }
        case CMD_LOGOUT:
        {
            Logout* loginOut = (Logout*)header;
            printf("收到命令： 数据长度：%d 用户名：%s密码%s\n", loginOut->dataLength, loginOut->userName);
            LogOutResult retOut = {};
            retOut.result = 0;
            send(_cSock, (const char *)&retOut, sizeof(LoginResult), 0);
            break;
        }
        default:
        {
            DataHeader header = { CMD_ERROR, 0 };
            send(_cSock, (const char *)&header, sizeof(DataHeader), 0);
            break;
        }
        }
    }
    // 发送数据给指定的socket
    int SendData(SOCKET _cSock, DataHeader* header)
    {
        if (isRun() && header)
            send(_cSock, (const char*)header, header->dataLength, 0);
        return SOCKET_ERROR;
    }
    //群发
    void SendDataToAll( DataHeader* header)
    {
        if (isRun() && header)
        {
            //广播所有客户端，新加入一个新的客户端
            for (std::vector<SOCKET>::iterator it = g_clients.begin(); it != g_clients.end(); it++)
            {
                SendData(*it, header);
            }
        }
    }

private:

};



#endif

MessageHeader.hpp：

#ifndef _MessageHeader_hpp_
#define _MessageHeader_hpp_
enum CMD 
{
    CMD_LOGIN,
    CMD_LOGIN_RESULT,
    CMD_LOGOUT,
    CMD_LOGOUT_RESULT,
    CMD_NEW_USER_JOIN,
    CMD_ERROR,
};
// 消息头
struct DataHeader 
{
    short dataLength;
    short cmd;
};
struct Login :public DataHeader 
{
    Login() 
    {
        dataLength = sizeof(Login);
        cmd = CMD_LOGIN;
    }
    char userName[32];
    char PassWord[32];
};

struct LoginResult : public DataHeader 
{
    LoginResult() 
    {
        dataLength = sizeof(LoginResult);
        cmd = CMD_LOGIN_RESULT;
        result = 0;
    }
    int result;
};

struct Logout :public DataHeader 
{
    Logout() 
    {
        dataLength = sizeof(Logout);
        cmd = CMD_LOGOUT;
    }
    char userName[32];
};

struct LogOutResult :public DataHeader 
{
    LogOutResult()
    {
        dataLength = sizeof(LogOutResult);
        cmd = CMD_LOGOUT_RESULT;
        result = 0;
    }
    int result;
};

struct NewUserJoin :public DataHeader
{
    NewUserJoin() 
    {
        dataLength = sizeof(NewUserJoin);
        cmd = CMD_NEW_USER_JOIN;
        sock = 0;
    }
    int sock;
};
#endif

Client部分：一共3个文件（Client.cpp，EasyTcpClient.hpp和MessageHeader.hpp）

Client.cpp：

#define _CRT_SECURE_NO_WARNINGS
#include <thread>
#include "EasyTcpClient.hpp"
#pragma comment(lib, "ws2_32.lib")

void cmdThread(EasyTcpClient *client)
{
    while (true) 
    {
        char cmdBuf[256] = {};
        scanf("%s", cmdBuf);

        if (0 == strcmp(cmdBuf, "exit")) {

            client->Close();
            printf("退出cmdThread线程\n");
            break;
        }

        else if (0 == strcmp(cmdBuf, "login")) 
        {
            Login login;
            strcpy(login.userName, "lyd");
            strcpy(login.PassWord, "lydmm");
            client->SendData(&login);
        }
        else if (0 == strcmp(cmdBuf, "logout")) 
        {
            Login logout;
            strcpy(logout.userName, "lyd");
            client->SendData(&logout);
        }
        else
            printf("不支持的命令。 \n");
    }
}

int main()
{
    EasyTcpClient client;
    client.initSocket();
    client.Connect("127.0.0.1", 10000);
    std::thread t1(cmdThread, &client);
    t1.detach();   // 线程分离

    while (client.isRun()) {

        client.OnRun();

        // printf("空闲时间处理其他业务...\n");

        // Sleep(1000);

    }
    client.Close();
    printf("已退出。 \n");
    getchar();
    return 0;
}

EasyTcpClient.hpp：

#pragma once
#ifdef _WIN32
#include <WinSock2.h>
#include <windows.h>
#include "MessageHeader.hpp"
#include <stdio.h>
#else
#include<unistd.h>
#include<arpa/inet.h>
#include<string.h>
#define SOCKET int
#define INVALID_SOCKET (SOCKET)(~0)
#define SOCKET_ERROR           (-1)
#include <stdio.h>
#endif
class EasyTcpClient
{
    SOCKET _sock;
public:
    EasyTcpClient() 
    {
        _sock = INVALID_SOCKET;
    }
    virtual ~EasyTcpClient() 
    {
        Close();
    }
    // 初始化socket

    void initSocket() 
    {
        // 启动Windows socket 2.x环境
#ifdef _WIN32
        WORD ver = MAKEWORD(2, 2);
        WSADATA dat;

        WSAStartup(ver, &dat);
#endif
        //----------------
        // 建立一个socket
        if (INVALID_SOCKET != _sock) 
        {
            printf("<sock=%d>关闭之前的连接...\n", _sock);
            Close();
        }
        _sock = socket(AF_INET, SOCK_STREAM, 0);

        if (INVALID_SOCKET == _sock)
            printf("错误,创建Socket失败...\n");
        else
            printf("建立Socket成功...\n");
    }
    // 连接服务器
    int Connect(const char* ip, unsigned short port) 
    {
        if (INVALID_SOCKET == _sock) 
        {
            initSocket();
        }
        // 连接服务器 connect
        sockaddr_in _sin = {};
        _sin.sin_family = AF_INET;
        _sin.sin_port = htons(port);
#ifdef _WIN32
        _sin.sin_addr.S_un.S_addr = inet_addr(ip);
#else
        _sin.sin_addr.s_addr = inet_addr(ip);
#endif
        int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
        if (SOCKET_ERROR == ret)
            printf("连接服务器错误...\n");
        else
            printf("连接服务器成功...\n");
        return ret;
    }
    void Close() 
    {
        if (_sock != INVALID_SOCKET) {
#ifdef _WIN32
            closesocket(_sock);
            WSACleanup();
#else
            close(_sock);
#endif
            _sock = INVALID_SOCKET;
        }
    }
    // 发送数据
    // 接受数据
    // 处理网络消息
    bool OnRun() 
    {
        if (isRun()) 
        {
            fd_set fdReads;
            FD_ZERO(&fdReads);
            FD_SET(_sock, &fdReads);
            timeval t = { 1, 0 };
            int ret = select(_sock + 1, &fdReads, 0, 0, &t);
            if (ret < 0) 
            {
                printf("<socket=%d>select任务结束\n", _sock);
                return false;
            }
            if (FD_ISSET(_sock, &fdReads))
            {
                FD_CLR(_sock, &fdReads);
                if (-1 == RecvData(_sock)) 
                {
                    printf("<socket=%d>select任务结束2\n", _sock);
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    bool isRun() 
    {
        return _sock != INVALID_SOCKET;
    }
    // 接受数据，处理粘包，拆分包
    int RecvData(SOCKET _cSock)
    {
        // 缓冲区
        char szRecv[4096] = {};
        int nLen = recv(_cSock, (char*)&szRecv, sizeof(DataHeader), 0);
        DataHeader* header = (DataHeader*)szRecv;
        if (nLen <= 0) 
        {
            printf("与服务器断开连接，任务结束。\n");
            return -1;
        }
        // 处理请求
        recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
        OnNetMsg(header);
        return 0;
    }
    // 响应网络
    void OnNetMsg(DataHeader* header) 
    {
        switch (header->cmd) 
        {
        case CMD_LOGIN_RESULT: 
        {
            LoginResult* login = (LoginResult*)header;
            printf("收到服务端消息:CMD_LOGIN_RESULT,数据长度:%d\n", header->dataLength);
            break;
        }

        case CMD_LOGOUT_RESULT: 
        {
            LogOutResult* logout = (LogOutResult*)header;
            printf("收到服务端消息:CMD_LOGOUT_RESULT,数据长度:%d\n", header->dataLength);
            break;
        }

        case CMD_NEW_USER_JOIN: 
        {
            NewUserJoin* userJoin = (NewUserJoin*)header;
            printf("收到服务端消息:CMD_NEW_USER_JOIN,数据长度:%d\n", header->dataLength);
            break;
        }
        }
    }

    // 发送数据
    int SendData(DataHeader* header) 
    {
        if (isRun() && header)
            send(_sock, (const char*)header, header->dataLength, 0);
        return SOCKET_ERROR;
    }
};

MessageHeader.hpp：

#ifndef _MessageHeader_hpp_
#define _MessageHeader_hpp_
enum CMD 
{
    CMD_LOGIN,
    CMD_LOGIN_RESULT,
    CMD_LOGOUT,
    CMD_LOGOUT_RESULT,
    CMD_NEW_USER_JOIN,
    CMD_ERROR,
};
// 消息头
struct DataHeader 
{
    short dataLength;
    short cmd;
};
struct Login :public DataHeader 
{
    Login() 
    {
        dataLength = sizeof(Login);
        cmd = CMD_LOGIN;
    }
    char userName[32];
    char PassWord[32];
};

struct LoginResult : public DataHeader 
{
    LoginResult() 
    {
        dataLength = sizeof(LoginResult);
        cmd = CMD_LOGIN_RESULT;
        result = 0;
    }
    int result;
};

struct Logout :public DataHeader 
{
    Logout() 
    {
        dataLength = sizeof(Logout);
        cmd = CMD_LOGOUT;
    }
    char userName[32];
};

struct LogOutResult :public DataHeader 
{
    LogOutResult()
    {
        dataLength = sizeof(LogOutResult);
        cmd = CMD_LOGOUT_RESULT;
        result = 0;
    }
    int result;
};

struct NewUserJoin :public DataHeader
{
    NewUserJoin() 
    {
        dataLength = sizeof(NewUserJoin);
        cmd = CMD_NEW_USER_JOIN;
        sock = 0;
    }
    int sock;
};
#endif