将客户端移植到Linux和MAC OS

1 将客户端移植到Linux和MAC OS

1.1 概述

我们这里把将客户端移植到Linux和MAC OS，由于Linux和MAC OS都是从Unix继承而来，所以两者关于socket部分操作接口完全相同。我们只需要关注和windows之间的差异即可。

1.2 客户端移植代码

客户端移植代码如下：
client.cpp：

#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<thread>

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;
};

int processor(SOCKET _cSock)
{
	//缓冲区
	char szRecv[4096] = {};
	// 5 接收客户端数据
	int nLen = (int)recv(_cSock, szRecv, sizeof(DataHeader), 0);
	DataHeader* header = (DataHeader*)szRecv;
	if (nLen <= 0)
	{
		printf("与服务器断开连接，任务结束。\n");
		return -1;
	}
	switch (header->cmd)
	{
	case CMD_LOGIN_RESULT:
	{
		recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
		LoginResult* login = (LoginResult*)szRecv;
		printf("收到服务端消息：CMD_LOGIN_RESULT,数据长度：%d\n", login->dataLength);
	}
	break;
	case CMD_LOGOUT_RESULT:
	{
		recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
		LogoutResult* logout = (LogoutResult*)szRecv;
		printf("收到服务端消息：CMD_LOGOUT_RESULT,数据长度：%d\n", logout->dataLength);
	}
	break;
	case CMD_NEW_USER_JOIN:
	{
		recv(_cSock, szRecv + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
		NewUserJoin* userJoin = (NewUserJoin*)szRecv;
		printf("收到服务端消息：CMD_NEW_USER_JOIN,数据长度：%d\n", userJoin->dataLength);
	}
	break;
	}
	return 0;
}
bool g_bRun = true;
void cmdThread(SOCKET sock)
{
	while (true)
	{
		char cmdBuf[256] = {};
		scanf("%s", cmdBuf);
		if (0 == strcmp(cmdBuf, "exit"))
		{
			g_bRun = false;
			printf("退出cmdThread线程\n");
			break;
		}
		else if (0 == strcmp(cmdBuf, "login"))
		{
			Login login;
			strcpy(login.userName, "lyd");
			strcpy(login.PassWord, "lydmm");
			send(sock, (const char*)&login, sizeof(Login), 0);
		}
		else if (0 == strcmp(cmdBuf, "logout"))
		{
			Logout logout;
			strcpy(logout.userName, "lyd");
			send(sock, (const char*)&logout, sizeof(Logout), 0);
		}
		else {
			printf("不支持的命令。\n");
		}
	}
}

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客户端
	// 1 建立一个socket
	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);
#ifdef _WIN32
	_sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
#else
	_sin.sin_addr.s_addr = inet_addr("192.168.74.1");
#endif
	int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
	if (SOCKET_ERROR == ret)
	{
		printf("错误，连接服务器失败...\n");
	}
	else {
		printf("连接服务器成功...\n");
	}
	//启动线程
	std::thread t1(cmdThread, _sock);
	t1.detach();

	while (g_bRun)
	{
		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("select任务结束1\n");
			break;
		}
		if (FD_ISSET(_sock, &fdReads))
		{
			FD_CLR(_sock, &fdReads);

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

		//printf("空闲时间处理其它业务..\n");

		//Sleep(1000);
	}
	// 7 关闭套节字closesocket
#ifdef _WIN32
	closesocket(_sock);
	//清除Windows socket环境
	WSACleanup();
#else
	close(_sock);
#endif
	printf("已退出。\n");
	getchar();
	return 0;
}

编译选项：g++ client.cpp -std=c++11 -pthread -o client。

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参考资料：

1. C++ 百万并发网络通信引擎架构与实现 （服务端、客户端、跨平台） Version 1.0