13.客户端封装Client类，支持跨平台

将tcp的客户端封装成类

客户端 ：

DataHeader.hpp

#ifndef _MessageHeader_hpp_
#define _MessageHeader_hpp_


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;
};

#endif

 

 

EasyTcpClient.hpp

#ifndef _EasyTcpClient_hpp_
#define _EasyTcpClient_hpp_

#ifdef _WIN32
    #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 <stdio.h>
#include "DataHeader.hpp"

class  EasyTcpClient
{
public:
    EasyTcpClient()
    {
        _sock = INVALID_SOCKET;
    }
    //虚析构函数
    virtual ~EasyTcpClient()
    {
        Close();
    }

    //初始化socket
    void InitSocket()
    {
#ifdef _WIN32
        WORD ver = MAKEWORD(2, 2);
        WSADATA dat;
        WSAStartup(ver, &dat);
#endif // _WIN32

        if (_sock != INVALID_SOCKET)
        {
            Close();
        }

        _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");
        }

    }

    int Connect(const char* ip, unsigned short port)
    {
        if (INVALID_SOCKET == _sock)
        {
            InitSocket();
        }

        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, (const sockaddr*)&_sin, sizeof(sockaddr_in));
        if (SOCKET_ERROR == ret)
        {
            printf("错误，连接服务端失败...\n");
        }
        else
        {
            printf("连接服务端成功...\n");
        }
        
        return ret;
    }

    bool isRun()
    {
        return (_sock != INVALID_SOCKET);
    }

    bool onRun()
    {
        if (isRun())
        {
            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)
            {
                Close();
                printf("select任务结束1。\n");
                return false;
            }

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

        }
    }

    //接收数据 处理粘包 拆分包
    int RecvData()
    {

        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;
        recv(_sock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);

        onNetMsg(pHeader);

        return 0;
    }

    void onNetMsg(DataHeader* pData)
    {
        switch (pData->cmd)
        {
        case CMD_LOGIN_RET:
        {
            LoginResult *pLogin = (LoginResult*)pData;
            printf("login result:%d\n", pLogin->ret);
        }
        break;
        case CMD_LOGOUT_RET:
        {
            LogOutResult *pLogOut = (LogOutResult*)pData;
            printf("log out result:%d\n", pLogOut->ret);
        }
        break;
        case CMD_NEW_USER_JOIN:
        {
            NewUserJoin *pMsg = (NewUserJoin*)pData;
            printf("new user:%d join.\n", pMsg->sock);
        }
        break;
        }
    }

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

    void Close()
    {
        if (_sock != INVALID_SOCKET)
        {
#ifdef _WIN32
            closesocket(_sock);
            //清除Windows socket环境
            WSACleanup();
#else
            close(_sock);
#endif
            _sock = INVALID_SOCKET;
        }
    }

private:
    SOCKET _sock;

};


#endif

 

 

 

main.cpp

#ifdef  _WIN32
    #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
    #pragma comment(lib, "ws2_32.lib")
#endif 

#include <stdio.h>
#include <thread>
#include "EasyTcpClient.hpp"


void cmdThread(EasyTcpClient* pClient)
{
    while (true)
    {
        //3输入请求命令
        char cmdBuf[128] = {};
        scanf("%s", cmdBuf);
        getchar();
        //4处理请求
        if (0 == strcmp(cmdBuf, "exit"))
        {
            printf("退出cmdThread线程\n");
            pClient->Close();
            return;
        }
        else if (0 == strcmp(cmdBuf, "login"))
        {

            Login login = {};
            strcpy(login.userName, "jj");
            strcpy(login.passWord, "ww");
            pClient->SendData(&login);
        }
        else if (0 == strcmp(cmdBuf, "logout"))
        {
            LogOut log_out = {};
            strcpy(log_out.userName, "jj");
            pClient->SendData(&log_out);
        }
        else
        {
            printf("wrong cmd, please input cmd again.\n");
        }
    }
}

int main()
{
    EasyTcpClient client;
    client.Connect("127.0.0.1", 4567);

    std::thread t(cmdThread, &client);
    t.detach();

        
    while ( client.isRun() )
    {
        client.onRun();
    }

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

 

 

服务端：

#ifdef _WIN32
    //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>
    #pragma comment(lib, "ws2_32.lib")
#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 <stdio.h>
#include <vector>

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 = (int)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()
{
#ifdef _WIN32
    //启动Windows socket 2.x环境
    WORD ver = MAKEWORD(2, 2);
    WSADATA dat;
    WSAStartup(ver, &dat);
#endif

    //--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

#ifdef _WIN32
    _sin.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
#else
    _sin.sin_addr.s_addr = INADDR_ANY;
#endif
    //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);

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

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

        if (FD_ISSET(_sock, &fdRead))
        {
            FD_CLR(_sock, &fdRead);//从集合移除了_sock
            sockaddr_in clientAddr = {};
            int nAddrLen = sizeof(clientAddr);
            SOCKET _cSock = INVALID_SOCKET;
#ifdef _WIN32
            _cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
#else
            _cSock = accept(_sock, (sockaddr*)&clientAddr, (socklen_t*)&nAddrLen);
#endif
            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 (int n = (int)g_clients.size() - 1; n >= 0; n--)
        {
            if (FD_ISSET(g_clients[n], &fdRead))
            {
                if (-1 == processor(g_clients[n]))
                {
                    auto iter = g_clients.begin() + n;
                    if (iter != g_clients.end())
                    {
                        g_clients.erase(iter);
                    }
                }
            }
        }




    }

#ifdef _WIN32
    // 关闭套接字
    for (size_t n = 0; n<g_clients.size(); n++)
    {
        closesocket(g_clients[n]);
    }
    closesocket(_sock);
    //清除Windows socket环境
    WSACleanup();
#else
    for (size_t n = 0; n<g_clients.size(); n++)
    {
        close(g_clients[n]);
    }
    close(_sock);
#endif
    
    g_clients.clear();
    printf("已退出。\n");
    getchar();
    return 0;
}