9.客户端升级为select网络模型

新用户连接到服务端时，服务端主动推送一个 新用户登录的 消息给 其他客户端

服务端：

//vc的第一套socket，第二套socket，可能存在冲突

#define WIN32_LEAN_AND_MEAN
#define  _WINSOCK_DEPRECATED_NO_WARNINGS //也可以放到工程属性，预处理中

#include <windows.h>
#include <WinSock2.h>
#include <stdio.h>
#include <vector>

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

enum CMD
{
    CMD_LOGIN,
    CMD_LOGIN_RET,
    CMD_LOGOUT,
    CMD_LOGOUT_RET,
    CMD_NEW_USER_JOIN,
    CMD_ERROR
};


struct DataHeader
{
    int dataLength;
    CMD    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_RET;
        ret = 0;
    }
    int ret;
};

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_RET;
        ret = 0;
    }
    int ret;
};

struct NewUserJoin :public DataHeader
{
    NewUserJoin()
    {
        dataLength = sizeof(NewUserJoin);
        cmd = CMD_NEW_USER_JOIN;
        sock = -1;
    }
    int sock;
};

int processor(SOCKET _cSock)
{

    //5 接收客户端数据
    char szRecv[1024] = {};

    int nLen = recv(_cSock, szRecv, sizeof(DataHeader), 0);
    if (nLen <= 0)
    {
        printf("客户端%d已退出。\n", _cSock);
        return -1;
    }

    DataHeader* pHeader = (DataHeader*)szRecv;

    switch (pHeader->cmd)
    {
    case CMD_LOGIN:
    {
        recv(_cSock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        Login *pLogin = (Login*)szRecv;
        printf("客户端%d,cmd logint,user:%s,password:%s\n", _cSock, pLogin->userName, pLogin->passWord);
        //----------------------------
        //----------------------------
        LoginResult longinRet = {};
        send(_cSock, (const char*)&longinRet, sizeof(LoginResult), 0);
    }
    break;
    case CMD_LOGOUT:
    {

        recv(_cSock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        LogOut *pLogOut = (LogOut*)szRecv;
        printf("客户端%d,cmd logout,user:%s\n", _cSock, pLogOut->userName);
        //----------------------------
        LogOutResult logOutRet = {};
        send(_cSock, (const char*)&logOutRet, sizeof(LogOutResult), 0);
    }
    break;
    default:
    {
        //剩余的垃圾数据是否要读取出来？
        if (pHeader->dataLength >0)
        {
            recv(_cSock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        }

        DataHeader header = {};
        header.cmd = CMD_ERROR;
        header.dataLength = 0;
        send(_cSock, (const char*)&header, sizeof(DataHeader), 0);
    }
    break;
    }

    return 0;
}

std::vector<SOCKET> g_clients;

int main()
{
    //启动Windows socket 2.x环境
    WORD ver = MAKEWORD(2, 2);
    WSADATA dat;
    WSAStartup(ver, &dat);

    //--用Socket API建立简易TCP服务端
    //1.建立一个socket
    SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    //2 bind绑定用于接受客户端连接的网络端口
    sockaddr_in _sin = {};
    _sin.sin_family = AF_INET;
    _sin.sin_port = htons(4567);//host to net unsigned
    _sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    //使用127.0.0.1可以防止外网访问
    //启用本机全部的ip地址可以使用，INADDR_ANY
    if (SOCKET_ERROR == bind(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in)))
    {
        printf("错误，绑定网络端口失败...\n");
    }
    else
    {
        printf("绑定网络端口成功...\n");
    }
    //3 listen 监听网络端口
    if (SOCKET_ERROR == listen(_sock, 5))
    {
        printf("错误，监听网络端口失败...\n");
    }
    else
    {
        printf("监听网络端口成功...\n");
    }



    while (true)
    {
        fd_set fdRead;
        fd_set fdWrite;
        fd_set fdExp;

        FD_ZERO(&fdRead);
        FD_ZERO(&fdWrite);
        FD_ZERO(&fdExp);

        FD_SET(_sock, &fdRead);
        FD_SET(_sock, &fdWrite);
        FD_SET(_sock, &fdExp);

        for (size_t n = 0; n<g_clients.size(); n++)
        {
            FD_SET(g_clients[n], &fdRead);
        }

        timeval t = {1,0};
        int ret = select(_sock + 1, &fdRead, &fdWrite, &fdExp, &t);
        if (ret < 0)
        {
            printf("select任务结束。\n");
            break;
        }

        if (FD_ISSET(_sock, &fdRead))
        {
            //4 accept等待接受客户端连接
            sockaddr_in clientAddr = {};
            int nAddrLen = sizeof(clientAddr);
            SOCKET _cSock = INVALID_SOCKET;

            _cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
            if (INVALID_SOCKET == _cSock)
            {
                printf("错误，接受到无效客户端socket...\n");
            }
            else
            {
                for (int n = 0; n<g_clients.size(); n++)
                {
                    NewUserJoin msg;
                    msg.sock = _cSock;
                    send(g_clients[n], (const char*)&msg, sizeof(NewUserJoin), 0);
                }

                g_clients.push_back(_cSock);
                printf("新客户端加入:socket=%d,IP=%s\n", _cSock, inet_ntoa(clientAddr.sin_addr));
            }

        }

        for (size_t n = 0; n<fdRead.fd_count; n++)
        {
            auto iter = find(g_clients.begin(), g_clients.end(), fdRead.fd_array[n]);
            if (iter != g_clients.end())
            {
                if (-1 == processor(fdRead.fd_array[n]))
                {
                    closesocket(*iter);
                    g_clients.erase(iter);
                }
            }

        }



    }

    //6 关闭套接字closesocket
    for (size_t n = 0; n<g_clients.size(); n++)
    {
        closesocket(g_clients[n]);
    }
    closesocket(_sock);


    //清除Windows socket环境
    WSACleanup();
    printf("已退出。\n");
    getchar();
    return 0;
}

 

 

客户端：

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS //也可以放到工程属性，预处理中
//#define _CRT_SECURE_NO_WARNINGS

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


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

enum CMD
{
    CMD_LOGIN,
    CMD_LOGIN_RET,
    CMD_LOGOUT,
    CMD_LOGOUT_RET,
    CMD_NEW_USER_JOIN,
    CMD_ERROR
};

struct DataHeader
{
    int dataLength;
    CMD    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_RET;
        ret = 1;
    }
    int ret;
};

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_RET;
        ret = 1;
    }
    int ret;
};

struct NewUserJoin :public DataHeader
{
    NewUserJoin()
    {
        dataLength = sizeof(NewUserJoin);
        cmd = CMD_NEW_USER_JOIN;
        sock = -1;
    }
    int sock;
};

int processor(SOCKET _sock)
{
    //5 接收客户端数据
    char szRecv[1024] = {};

    int nLen = recv(_sock, szRecv, sizeof(DataHeader), 0);
    if (nLen <= 0)
    {
        printf("服务端%d已退出。\n", _sock);
        return -1;
    }

    DataHeader* pHeader = (DataHeader*)szRecv;

    switch (pHeader->cmd)
    {
    case CMD_LOGIN_RET:
    {
        recv(_sock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        LoginResult *pLogin = (LoginResult*)szRecv;
        printf("login result:%d\n", pLogin->ret);
    }
    break;
    case CMD_LOGOUT_RET:
    {
        recv(_sock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        LogOutResult *pLogOut = (LogOutResult*)szRecv;
        printf("log out result:%d\n", pLogOut->ret);
    }
    break;
    case CMD_NEW_USER_JOIN:
    {
        recv(_sock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);
        NewUserJoin *pMsg = (NewUserJoin*)szRecv;
        printf("new user:%d join.\n", pMsg->sock);
    }
    break;
    }

    return 0;

}

int main()
{

    //启动Windows socket 2.x环境
    WORD ver = MAKEWORD(2, 2);
    WSADATA dat;
    WSAStartup(ver, &dat);
    //---------------------------
    //--用Socket API建立简易TCP客户端
    //1 建立一个socket
    SOCKET _sock = INVALID_SOCKET;
    _sock = socket(AF_INET, SOCK_STREAM, 0);
    if (INVALID_SOCKET == _sock)
    {
        printf("错误，建立Socket失败...\n");
    }
    else
    {
        printf("建立Socket成功...\n");
    }
    //2 连接服务器connect
    sockaddr_in _sin = {};
    _sin.sin_family = AF_INET;
    _sin.sin_port = htons(4567);//host to net unsigned
    _sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
    if (SOCKET_ERROR == ret)
    {
        printf("错误，连接服务端失败...\n");


        closesocket(_sock);

        //清除Windows socket环境
        WSACleanup();
        printf("已退出。");
        getchar();
        return 0;
    }
    else
    {
        printf("连接服务端成功...\n");
    }


    while (true)
    {

        fd_set fdRead;
        FD_ZERO(&fdRead);
        FD_SET(_sock, &fdRead);

        timeval t = { 1,0 };
        int ret = select(_sock + 1, &fdRead, 0,0, &t);
        if (ret < 0)
        {
            printf("select任务结束1。\n");
            break;
        }

        if (FD_ISSET(_sock, &fdRead))
        {
            if (-1 == processor(_sock))
            {
                printf("select任务结束2。\n");
                break;
            }
        }

    }



    //7 关闭套接字closesocket
    closesocket(_sock);

    //清除Windows socket环境
    WSACleanup();
    printf("已退出");
    getchar();
    return 0;
}