客户端升级封装EasyTcpClient，同时与多个服务端进行网络通信

封装客户端操作EasyTcpClient.hpp

#ifdef EasyTcpClient.hpp
	#define EasyTcpClient.hpp
#endif
#ifdef _WIN32
	#define WIN32_LEAN_AND_MEAN
	#define _WINSOCK_DEPRECATED_NO_WARNINGS
	#define _CRT_SECURE_NO_WARNINGS
	#include <WinSock2.h>
	#include <windows.h>
	#pragma comment(lib,"ws2_32.lib")
#else
	#include <unistd.h>  //uni std
	#include <arpa/inet.h>
	#include <string.h>
	#include <stdint.h>

	#define SOCKET int
	#define INVALID_SOCKET  (SOCKET)(~0)
	#define SOCKET_ERROR            (-1)
#endif
#include "MessageHeader.hpp"
#include <iostream>
#include <thread>	//C++标准线程库
using namespace std;

class EasyTcpClient
{
	SOCKET _sock;
public:
	EasyTcpClient() {
		_sock = INVALID_SOCKET;
	}
	//虚构析函数
	virtual ~EasyTcpClient() {

	}

	//初始化Socket
	void InitSocket() {
		//启动Win Socket 2.x环境
#ifdef _WIN32
		WORD ver = MAKEWORD(2, 2);
		WSADATA dat;
		WSAStartup(ver, &dat);
#endif // _WIN32
		// 1 建立一个socket
		if (IsRun()) {
			cout << "<socket = " << (int)_sock << "> 关闭旧连接..." << endl;
			Close();
		}
		_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (!IsRun()) {
			cout << "<socket = " << (int)_sock << ">建立Socket失败..." << endl;
		}
		else {
			cout << "<socket = " << (int)_sock << ">建立Socket成功..." << endl;
		}

	}

	//连接服务器
	int Connect(const char* ip, unsigned short port) {
		if (!IsRun()) {
			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
		cout << "<socket = " << (int)_sock << "> 正在连接服务器<port:" << port << ">..." << endl;
		int  ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
		if (SOCKET_ERROR == ret) {
			cout << "<socket = " << (int)_sock << "> 连接服务器<port:" << port << ">失败..." << endl;
		}
		else {
			cout << "<socket = " << (int)_sock << "> 连接服务器<port:" << port << ">成功..." << endl;
		}
		return ret;
	}

	// 关闭套接字closesocket
	void Close() {
		if (IsRun()) {
#ifdef _WIN32
			closesocket(_sock);
			// 清除windows socket环境
			WSACleanup();
#else
			close(_sock);
#endif // _WIN32
			_sock = INVALID_SOCKET;
		}

	}
	//相应网络请求
	void OnNetMsg(DataHeader* header) {
		switch (header->cmd) {
		case CMD_LOGIN_RESULT: {

			LoginResult* login = (LoginResult*)header;
			cout << "<socket = " << (int)_sock << ">收到服务端消息：CMD_LOGIN_RESULT, 数据长度：" << login->dataLength << endl;
			break;
		}
		case CMD_LOGOUT_RESULT: {
			LogoutResult* logout = (LogoutResult*)header;
			cout << "<socket = " << (int)_sock << ">收到服务端消息：CMD_LOGOUT_RESULT, 数据长度：" << logout->dataLength << endl;
			break;
		}
		case CMD_NEW_USER_JOIN: {
			NewUserJoin* userJoin = (NewUserJoin*)header;
			cout << "<socket = " << (int)_sock << ">收到服务端消息：CMD_LOGOUT_RESULT, 数据长度：" << userJoin->dataLength << endl;
			break;
		}
		}
	}

	//接受数据 处理粘包 拆分包
	int RecvData(SOCKET _cSock) {
		//缓冲区
		char szRecv[4096] = {};
		// 5 接收客户端数据
		int nLen = recv(_cSock, szRecv, sizeof(DataHeader), 0);
		DataHeader* header = (DataHeader*)szRecv;
		if (nLen <= 0) {
			cout << "<socket = " << (int)_sock << ">与服务器断开连接，任务结束..." << endl;
			return -1;
		}
		recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
		OnNetMsg(header);
		return 0;
	}

	//查询网络数据
	bool OnRun() {
		if (IsRun()) {
			fd_set fdReads;
			FD_ZERO(&fdReads);
			FD_SET(_sock, &fdReads);
			timeval t = { 0,0 };
			int ret = select(_sock + 1, &fdReads, 0, 0, &t);
			if (ret < 0) {
				cout << "<socket = " << (int)_sock << ">select任务结束1..." << endl;
				Close();
				return false;
			}

			if (FD_ISSET(_sock, &fdReads)) {
				FD_CLR(_sock, &fdReads);
				if (-1 == RecvData(_sock)) {
					cout << "<socket = " << (int)_sock << ">select任务结束2..." << endl;
					Close();
					return false;
				}
			}
		}
		return true;
	}
	//是否在工作
	bool IsRun() {

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

private:

};

封装消息头MessageHeader.hpp

#ifdef _MessageHeader.hpp
#define _MessageHeader.hpp
#endif // _MessageHeader.hpp

#pragma region 结构体定义
enum CMD {
	CMD_LOGIN,
	CMD_LOGOUT,
	CMD_ERROR,
	CMD_LOGIN_RESULT,
	CMD_LOGOUT_RESULT,
	CMD_NEW_USER_JOIN
};

struct DataHeader {
	short dataLength;
	short cmd;
};

struct Login : public DataHeader {//DataPackage
	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;
};

struct DataPackage {
	int age;
	char name[32];
};

#pragma endregion

重构客户端代码Client.cpp

#include "EasyTcpClient.hpp"

void cmdThread(EasyTcpClient *client) {
	while (true) {
		char cmdBuf[256] = {};
		cin >> cmdBuf;
		/*cout << cmdBuf << endl;*/
		if (0 == strcmp(cmdBuf, "exit")) {
			cout << "退出cmdThread线程" << endl;
			client->Close();
			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")) {
			Logout logout;
			strcpy(logout.userName, "lyd");
			client->SendData(&logout);
		}
		else {
			cout << "不支持的命令..." << endl;
		}
	}
}

int main() {

	char Local_ip[] = "127.0.0.1";
	unsigned short Local_port = 4568;
	EasyTcpClient client;
	client.Connect(Local_ip, Local_port);
	thread t1(cmdThread, &client);
	t1.detach();

	char Centos_ip[] = "192.168.88.130";
	unsigned short Centos_port = 4567;
	EasyTcpClient client2;
	client2.Connect(Centos_ip, Centos_port);
	thread t2(cmdThread, &client2);
	t2.detach();

	// 启动UI线程
	while (client.IsRun() || client2.IsRun()) {
		client.OnRun();
		client2.OnRun();
	}
	client.Close();
	client2.Close();
	//保留界面
	getchar();
	getchar();
	return 0;
}