封裝Client

1 封裝Client

1.1 概述

爲了更方便的使用client的功能，我們這裏把Client相關代碼進行封裝。

1.2 封裝Client

封裝後主要有如下三個文件：

MessageHeader.hpp：

enum CMD
{
	CMD_LOGIN,
	CMD_LOGIN_RESULT,
	CMD_LOGOUT,
	CMD_LOGOUT_RESULT,
	CMD_NEW_USER_JOIN,
	CMD_ERROR
};

struct DataHeader
{
	short dataLength;
	short cmd;
};

//DataPackage
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;
		scok = 0;
	}
	int scok;
};

EasyTcpClient.hpp：

#ifndef _EasyTcpClient_hpp_
#define _EasyTcpClient_hpp_

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

	#define SOCKET int
	#define INVALID_SOCKET  (SOCKET)(~0)
	#define SOCKET_ERROR            (-1)
#endif
#include <stdio.h>
#include "MessageHeader.hpp"

class EasyTcpClient
{
	SOCKET _sock;
public:
	EasyTcpClient()
	{
		_sock = INVALID_SOCKET;
	}
	
	virtual ~EasyTcpClient()
	{
		Close();
	}
	//初始化socket
	void InitSocket()
	{
#ifdef _WIN32
		//啓動Windows socket 2.x環境
		WORD ver = MAKEWORD(2, 2);
		WSADATA dat;
		WSAStartup(ver, &dat);
#endif
		if (INVALID_SOCKET != _sock)
		{
			printf("<socket=%d>關閉舊連接...\n", _sock);
			Close();
		}
		_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (INVALID_SOCKET == _sock)
		{
			printf("錯誤，建立Socket失敗...\n");
		}
		else {
			printf("建立Socket成功...\n");
		}
	}

	//連接服務器
	int Connect(char* ip,unsigned short port)
	{
		if (INVALID_SOCKET == _sock)
		{
			InitSocket();
		}
		// 2 連接服務器 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("錯誤，連接服務器失敗...\n");
		}
		else {
			printf("連接服務器成功...\n");
		}
		return ret;
	}

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

	//處理網絡消息
	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任務結束1\n", _sock);
				return false;
			}
			if (FD_ISSET(_sock, &fdReads))
			{
				FD_CLR(_sock, &fdReads);

				if (-1 == RecvData(_sock))
				{
					printf("<socket=%d>select任務結束2\n", _sock);
					return false;
				}
			}
			return true;
		}
		return false;
	}

	//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)
	{
		//緩衝區
		char szRecv[4096] = {};
		// 5 接收客戶端數據
		int nLen = (int)recv(_cSock, szRecv, sizeof(DataHeader), 0);
		DataHeader* header = (DataHeader*)szRecv;
		if (nLen <= 0)
		{
			printf("與服務器斷開連接，任務結束。\n");
			return -1;
		}
		recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);

		OnNetMsg(header);
		return 0;
	}

	//響應網絡消息
	void OnNetMsg(DataHeader* header)
	{
		switch (header->cmd)
		{
		case CMD_LOGIN_RESULT:
		{
			
			LoginResult* login = (LoginResult*)header;
			printf("收到服務端消息：CMD_LOGIN_RESULT,數據長度：%d\n", login->dataLength);
		}
		break;
		case CMD_LOGOUT_RESULT:
		{
			LogoutResult* logout = (LogoutResult*)header;
			printf("收到服務端消息：CMD_LOGOUT_RESULT,數據長度：%d\n", logout->dataLength);
		}
		break;
		case CMD_NEW_USER_JOIN:
		{
			NewUserJoin* userJoin = (NewUserJoin*)header;
			printf("收到服務端消息：CMD_NEW_USER_JOIN,數據長度：%d\n", userJoin->dataLength);
		}
		break;
		}
	}

	//發送數據
	int SendData(DataHeader* header)
	{
		if (isRun() && header)
		{
			return send(_sock, (const char*)header, header->dataLength, 0);
		}
		return SOCKET_ERROR;
	}
private:

};

#endif

client.cpp：

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

void cmdThread(EasyTcpClient* client)
{
	while (true)
	{
		char cmdBuf[256] = {};
		scanf("%s", cmdBuf);
		if (0 == strcmp(cmdBuf, "exit"))
		{
			client->Close();
			printf("退出cmdThread線程\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"))
		{
			Logout logout;
			strcpy(logout.userName, "lyd");
			client->SendData(&logout);
		}
		else {
			printf("不支持的命令。\n");
		}
	}
}

int main()
{

	EasyTcpClient client;
	client.Connect("127.0.0.1", 4567);

	//啓動UI線程
	std::thread t1(cmdThread, &client);
	t1.detach();


	while (client.isRun())
	{
		client.OnRun();
		//printf("空閒時間處理其它業務..\n");
		//Sleep(1000);
	}
	client.Close();

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

---

參考資料：

1. C++ 百萬併發網絡通信引擎架構與實現 （服務端、客戶端、跨平臺） Version 1.0