14.服務封裝Server類，支持跨平臺

客戶端：

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;
    }
    //虛析構函數
    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("錯誤，建立Socket失敗...\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("錯誤，連接服務端失敗...\n");
        }
        else
        {
            printf("連接服務端成功...\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任務結束1。\n");
                return false;
            }

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

        }
    }

    //接收數據 處理粘包 拆分包
    int RecvData()
    {

        char szRecv[1024] = {};

        int nLen = recv(_sock, szRecv, sizeof(DataHeader), 0);
        if (nLen <= 0)
        {
            printf("服務端%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;
        }
    }

    //發送數據
    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環境
            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 //也可以放到工程屬性，預處理中
    #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輸入請求命令
        char cmdBuf[128] = {};
        scanf("%s", cmdBuf);
        getchar();
        //4處理請求
        if (0 == strcmp(cmdBuf, "exit"))
        {
            printf("退出cmdThread線程\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("192.168.10.157", 4567);

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

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

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

服務端：

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 = 7;
    }
    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 = 9;
    }
    int ret;
};

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

#endif

EasyTcpServer.hpp

#ifndef _EasyTcpServer_hpp_
#define _EasyTcpServer_hpp_

#ifdef _WIN32
//vc的第一套socket，第二套socket，可能存在衝突
#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS //也可以放到工程屬性，預處理中
#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>
#include "DataHeader.hpp"

class EasyTcpServer
{
public:
    EasyTcpServer()
    {
        _sock = INVALID_SOCKET;
    }

    virtual ~EasyTcpServer()
    {
        Close();
    }

    //初始化socket
    SOCKET 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("錯誤，建立Socket失敗...\n");
        }
        else
        {
            printf("建立Socket成功...\n");
        }

        return _sock;
    }

    //綁定端口號
    int Bind(const char* ip, unsigned short port)
    {
        sockaddr_in _sin = {};
        _sin.sin_family = AF_INET;
        _sin.sin_port = htons(4567);//host to net unsigned short

                                    //使用127.0.0.1可以防止外網訪問
                                    //啓用本機全部的ip地址可以使用，INADDR_ANY

#ifdef _WIN32
        if (ip)
        {
            _sin.sin_addr.S_un.S_addr = inet_addr(ip);
        }
        else
        {
            _sin.sin_addr.S_un.S_addr = INADDR_ANY;
        }

#else
        if (ip)
        {
            _sin.sin_addr.s_addr = inet_addr(ip);
        }
        else
        {
            _sin.sin_addr.s_addr = INADDR_ANY;
        }

#endif

        int ret = bind(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
        if (SOCKET_ERROR == ret)
        {
            printf("錯誤，綁定網絡端口失敗...\n");
        }
        else
        {
            printf("綁定網絡端口成功...\n");
        }

        return ret;
    }

    //監聽端口號
    int Listen(int cnt)
    {
        int ret = listen(_sock, cnt);
        if (SOCKET_ERROR == ret)
        {
            printf("錯誤，監聽網絡端口失敗...\n");
        }
        else
        {
            printf("監聽網絡端口成功...\n");
        }

        return ret;
    }

    //接收客戶端連接
    int Accept()
    {
        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("錯誤，接受到無效客戶端socket...\n");
        }
        else
        {

            NewUserJoin msg;
            msg.sock = _cSock;
            Send2All(&msg);

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

        return _cSock;
    }

    //關閉socket
    void Close()
    {
        if (_sock != INVALID_SOCKET)
        {
#ifdef _WIN32
            // 關閉套接字
            for (size_t n = 0; n<clients.size(); n++)
            {
                closesocket(clients[n]);
            }
            closesocket(_sock);
            //清除Windows socket環境
            WSACleanup();
#else
            for (size_t n = 0; n<clients.size(); n++)
            {
                close(clients[n]);
            }
            close(_sock);
#endif

        }

    }

    //處理網絡消息
    bool OnRun()
    {
        if (!isRun())
        {
            return false;
        }

        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<clients.size(); n++)
        {
            FD_SET(clients[n], &fdRead);
            if (maxSock < clients[n])
            {
                maxSock = clients[n];
            }
        }

        timeval t = { 1,0 };
        int ret = select(maxSock + 1, &fdRead, &fdWrite, &fdExp, &t);
        if (ret < 0)
        {
            printf("select任務結束。\n");
            Close();
            return false;
        }


        if (FD_ISSET(_sock, &fdRead))
        {
            FD_CLR(_sock, &fdRead);//從集合移除了_sock

            Accept();
        }


        for (int n = (int)clients.size() - 1; n >= 0; n--)
        {
            if (FD_ISSET(clients[n], &fdRead))
            {
                if (-1 == RecvData(clients[n]))
                {
                    auto iter = clients.begin() + n;
                    if (iter != clients.end())
                    {
                        clients.erase(iter);
                    }
                }
            }
        }

        return true;
    }

    //是否工作中
    bool isRun()
    {
        return _sock != INVALID_SOCKET;
    }

    //接收數據 處理粘包 拆分包
    int RecvData(SOCKET _cSock)
    {

        //5 接收客戶端數據
        char szRecv[1024] = {};

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

        DataHeader* pHeader = (DataHeader*)szRecv;
        recv(_cSock, szRecv + sizeof(DataHeader), pHeader->dataLength - sizeof(DataHeader), 0);

        onNetMsg(_cSock, pHeader);
        return 0;
    }

    //響應網絡消息
    virtual void onNetMsg(SOCKET _cSock, DataHeader* header)
    {
        switch (header->cmd)
        {
        case CMD_LOGIN:
        {
            Login *pLogin = (Login*)header;
            printf("客戶端%d,cmd logint,user:%s,password:%s\n", _cSock, pLogin->userName, pLogin->passWord);
            //----------------------------
            //----------------------------
            LoginResult longinRet = {};
            Send(_cSock, &longinRet);
        }
        break;
        case CMD_LOGOUT:
        {

            LogOut *pLogOut = (LogOut*)header;
            printf("客戶端%d,cmd logout,user:%s\n", _cSock, pLogOut->userName);
            //----------------------------
            LogOutResult logOutRet = {};
            Send(_cSock, &logOutRet);
        }
        break;
        default:
        {
            DataHeader header = {};
            header.cmd = CMD_ERROR;
            header.dataLength = 0;
            Send(_cSock, &header);
        }
        break;
        }
    }

    //指定socket發送數據
    int Send(SOCKET _cSock, DataHeader* header)
    {
        if (isRun() && header)
        {
            return send(_cSock, (const char*)header, header->dataLength, 0);
        }
        return SOCKET_ERROR;
    }

    void Send2All(DataHeader* header)
    {
        if (isRun() && header)
        {
            for (int n = (int)clients.size() - 1; n >= 0; n--)
            {
                Send(clients[n], header);
            }
        }

    }


private:
    SOCKET _sock;
    std::vector<SOCKET> clients;

};

#endif

main.cpp

#include "EasyTcpServer.hpp"

int main()
{
    EasyTcpServer server;
    server.InitSocket();
    server.Bind(nullptr, 4567);
    server.Listen(5);

    while ( server.isRun() )
    {
        server.OnRun();
    }
    
    
    server.Close();
    printf("已退出。\n");
    getchar();
    return 0;
}

14.服務封裝Server類，支持跨平臺

.NET開源強大、易於使用的緩存框架 - FusionCache

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圖片拖動並交換圖片

27.多線程，分組服務端，1萬客戶端連接，每秒處理200萬包

26.服務端單線程模式下性能瓶頸測試

24.原子操作

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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