首先将windows下客户端的代码贴入到Linux
#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include<Windows.h>
#include<WinSock2.h>
#include<iostream>
#include<string>
#include<thread>
using namespace std;
#pragma comment(lib,"ws2_32.lib") //windows socket2 32的lib库
//一定要保证服务端和客户端(操作系统)中 数据结构字节顺序和大小保证一致
struct DataPackage
{
int age;
char name[32];
};
enum CMD
{
CMD_LOGIN,
CMD_LOGIN_RESULT,
CMD_LOGINOUT,
CMD_LOGOUT_RESULT,
CMD_ERROR,
CMD_NEWUSERJOIN,
};
//消息头
struct DataHeader
{
short dataLength; //数据长度 32767字节
short cmd;
};
struct Login : public DataHeader
{
Login()
{
dataLength = sizeof(Login);
cmd = CMD_LOGIN;
}
char userName[32];
char Password[32];
};
struct Logout :public DataHeader
{
Logout()
{
dataLength = sizeof(Logout);
cmd = CMD_LOGINOUT;
}
char userName[32];
};
struct LoginResult :public DataHeader
{
LoginResult()
{
dataLength = sizeof(LoginResult);
cmd = CMD_LOGIN_RESULT;
result = 0;
}
int result;
};
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_NEWUSERJOIN;
sockId = 0;
}
int sockId;
};
int processor(SOCKET _sock)
{
char *szRecv = new char[1024];
//5 首先接收数据包头
int nlen = recv(_sock, szRecv, sizeof(DataHeader), 0); //接受客户端的数据 第一个参数应该是客户端的socket对象
if (nlen <= 0)
{
//客户端退出
cout << "客户端:Socket = " << _sock << " 与服务器断开连接,任务结束" << endl;
return -1;
}
DataHeader* header = (DataHeader*)szRecv;
switch (header->cmd)
{
case CMD_NEWUSERJOIN:
{
NewUserJoin _userJoin;
recv(_sock, (char*)&_userJoin + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
cout << "收到服务器消息: CMD_NEWUSERJOIN: SocketId = " << _userJoin.sockId << " 数据长度:" << header->dataLength << endl;
}break;
case CMD_LOGIN_RESULT:
{
LoginResult _lgRes;
recv(_sock, (char*)&_lgRes + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
cout << "收到服务器消息: CMD_LOGIN_RESULT: 登陆状态" << _lgRes.result << endl;
}break;
case CMD_LOGOUT_RESULT:
{
LogoutResult _lgRes;
recv(_sock, (char*)&_lgRes + sizeof(DataHeader), header->dataLength - sizeof(DataHeader), 0);
cout << "收到服务器消息: CMD_LOGIN_RESULT: 登出状态" << _lgRes.result << endl;
}break;
default:
{
header->cmd = CMD_ERROR;
header->dataLength = 0;
send(_sock, (char*)&header, sizeof(DataHeader), 0);
}
break;
}
return 0;
}
bool g_bRun = true;
void cmdThread(SOCKET _sock)
{
while (true)
{
// 3 输入请求命令
char cmdBuf[128] = {};
cout << "输入命令: ";
cin >> cmdBuf;
// 4 处理请求
if (strcmp(cmdBuf, "exit") == 0)
{
cout << "退出cmdThread线程" << endl;
g_bRun = false;
return;
}
else if (0 == strcmp(cmdBuf, "login"))
{
Login _login;
strcpy(_login.userName, "Evila");
strcpy(_login.Password, "Evila_Password");
// 5 向服务器发送请求命令
send(_sock, (const char*)&_login, _login.dataLength, 0);
}
else if (0 == strcmp(cmdBuf, "logout"))
{
Logout _logout;
strcpy(_logout.userName, "Evila");
//5 向服务器发送请求命令
send(_sock, (const char*)&_logout, _logout.dataLength, 0);
}
else
{
cout << "不受支持的命令" << endl;
}
}
return;
}
int main()
{
//启动 windows socket 2.x 环境
WORD versionCode = MAKEWORD(2, 2); //创建一个版本号
WSADATA data;
WSAStartup(versionCode, &data); //启动Socket网络API的函数
//1. 建立一个Socket
SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0); //用于网络链接的ipv4的socket
if (INVALID_SOCKET == _sock) //SIocket 每一步都可以判断是否成功建立
{
cout << "ERROR: SOCKET 建立失败" << endl;
}
else
{
cout << "SUCCESS: SOCKET 建立成功" << endl;
}
//2. 连接服务器 connect
sockaddr_in _sin = {};
_sin.sin_family = AF_INET;
_sin.sin_port = htons(4567); //host to net short
_sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
if (SOCKET_ERROR == connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in))) //SIocket 每一步都可以判断是否成功建立
{
cout << "ERROR: SOCKET 连接失败" << endl;
getchar();
return 0;
}
else
{
cout << "SUCCESS: SOCKET 连接成功" << endl;
}
//启动线程
std::thread t1(cmdThread,_sock);
t1.detach();//与主线程分离
while (g_bRun)
{
fd_set fdReads;
FD_ZERO(&fdReads);
FD_SET(_sock, &fdReads);
timeval t = { 1,0 };
int ret = select(_sock + 1, &fdReads, NULL, NULL, &t);
if (ret < 0)
{
cout << "select任务结束" << endl;
break;
}
if (FD_ISSET(_sock, &fdReads)) //如果_sock在fdRead里面,表明有需求等待处理
{
FD_CLR(_sock, &fdReads);
if (processor(_sock) == -1)
{
cout << "Select任务已结束2" << endl;
break;
}
}
}
//7. 关闭 socket
closesocket(_sock);
// 清除Windows socket环境
WSACleanup();
cout << "任务结束" << endl;
getchar();
return 0;
}
gcc 在Linux终端中 对cpp文件进行编译
g++ client.cpp -std=c++11 -pThread -o client
1、首先通过一个宏来判断 这段程序是运行在windows中还是Linuex中
#ifdef _WIN32
#include<windows.h>
#include<WinSock2.h>
#else
#include<unistd.h> //unix std
#include<arap/inet.h>
#endif
2、Linux系统中,没有对SOCKET类型进行定义。但其实SOCKET类型就是简单的无符号整形变量。
typedef UINT_PTR SOCKET;
同样的,包括INVALID_SOCKET、SOCKET_ERROR
#define INVALID_SOCKET (SOCKET)(~0)
#define SOCKET_ERROR (-1)
3、Linux中的客户端连接windows中的服务端时,那么ip地址就不是:127.0.0.1了;在Windows->cmd中输入ipconfig,找到适配于Vmware的ip地址。 (Linux中查看ip的命令是 ifconfig)
4、 Windows Socket启动和结束环境,Linux中不需要定义,直接通过ifdef 宏解决。
5、Linux中直接使用close()来关闭socket,像文件一样。
6、sockaddr_in在 Linux中的结构与windows不同。
做如下修改:
#ifdef _WIN32
_sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
#else
_sin.sin_addr.S_addr = inet_addr("127.0.0.1");
#endif