非阻塞模式多线程《客户端与服务器算数运算》 TCP/IP通信之二服务器端实现

灰太狼 2022-05-23 09:49 90阅读 0赞

1.  代码来源于 》》》》》》》》》》》》》》》》》》》》》 Windows Sockets网络开发VC++ 这本书

1.  在stdafx.h 中添加 \#pragma comment(lib,"ws2\_32.lib")

//funtiondec.h
    
    #ifndef FUNTIONDEC_H 
    #define FUNTIONDEC_H
    
    #include "winsock2.h" 
    
    #define SERVER_SETUP_FAIL  1 //启动服务器失败
    #define SERVERPORT 5556  //服务器TCP端口
    #define TIMEFOR_THREAD_EXIT 5000 //主线程睡眠时间
    #define TIMEFOR_THREAD_SLEEP 500 //等待客户端请求线程睡眠时间
    #define TIMEFOR_THREAD_CLIENT 500 //线程睡眠
    #define TIMEFOR_THREAD_HELP  500 
    #define MAX_NUM_BUF 48  //缓冲区的最大长度
    
    #define EXPRESSION 'E' //算数表达式
    #define BYEBYE 'B'  //消息byebye，Byebye,OK
    #define HEADERLEN (sizeof(hdr)) //头长度
    
    void InitMember(void);
    BOOL InitSocket(void);
    BOOL StartServer(void);
    BOOL CreateHelperAndAcceptThread(void);
    void StopService(void);
    void ExitServer(void);
    DWORD __stdcall HelperThread(void* pParam);
    DWORD __stdcall AcceptThread(void* pParam);
    
    //数据包头结构，该结构在win32下为4byte
    typedef struct _head
    {
    	char type;  //类型
    	unsigned short len;  //数据包的长度（包括头的长度）
    }hdr,*phdr;
    
    //数据包中的数据结构
    typedef struct _data
    {
    	char buf[MAX_NUM_BUF];  //数据
    
    }DATABUF,*pDataBuf;
    
    /*
    	数据包的操作
    */
    class CClient
    {
    public :
    	CClient(const SOCKET sClient, const sockaddr_in &addrClient);
    	virtual ~CClient();
    public:
    	BOOL StartRuning(void); //创建发送和接收数据线程
    	void HandleData(const char* pExpr);  //计算表达式
    	BOOL IsConning(void)
    	{
    		return m_bConning;
    	}
    	void DisConning(void)  //断开与客户端的连接
    	{
    		m_bConning = FALSE;
    	}
    	BOOL IsExit(void)  //接收和发送线程是否已经退出
    	{
    		return m_bExit;
    	}
    	char* Getm_addr()
    	{
    		return inet_ntoa(m_addr.sin_addr);;
    	}
    
    public:
    	static DWORD __stdcall RecvDataThread(void* pParam);  //接收客户端数据
    	static DWORD __stdcall SendDataThread(void* pParam); //向客户端发送数据
    
    private:
    	CClient();
    
    private:
    	SOCKET m_socket;  //套接字
    	sockaddr_in m_addr;  //地址
    	DATABUF m_data;  //数据
    	HANDLE m_hEvent;  //事件对象
    	HANDLE m_hThreadSend;  //发送数据线程句柄
    	HANDLE m_hThreadRecv;  //接收数据线程句柄
    	CRITICAL_SECTION m_cs;  //临界区对象
    	BOOL  m_bConning; //客户端连接状态
    	BOOL m_bExit; //线程退出
    };
    
    
    #endif

//CClient.cpp
    
    #include "stdafx.h"
    #include "funtiondec.h" 
    
    //构造函数
    CClient::CClient(const SOCKET sClient, const sockaddr_in &addrClient)
    {
    	//初始化变量
    	m_hThreadRecv = NULL;
    	m_hThreadSend = NULL;
    	m_socket = sClient;
    	m_addr = addrClient;
    	m_bConning = FALSE;
    	m_bExit = FALSE;
    	memset(m_data.buf, 0, MAX_NUM_BUF);
    	m_hEvent = CreateEvent(NULL, FALSE, FALSE, NULL); //手动设置信号状态 ，初始化为无信号状态
    	InitializeCriticalSection(&m_cs); //初始化临界区
    }
    
    //析构函数
    CClient::~CClient()
    {
    	closesocket(m_socket);  //关闭套接字
    	m_socket = INVALID_SOCKET;  //套机诶无效
    	DeleteCriticalSection(&m_cs); //释放临界区对象
    	CloseHandle(m_hEvent); //释放事件对象
    }
    
    /*
    	创建发送和接收数据线程
    */
    BOOL CClient::StartRuning(void)
    {
    	m_bConning = TRUE;  //设置连接状态
    
    	//创建接收数据线程
    	unsigned long ulThreadId;
    	m_hThreadRecv = CreateThread(NULL, 0, RecvDataThread, this, 0, &ulThreadId);
    	if (NULL == m_hThreadRecv)
    	{
    		return FALSE;
    	}
    	else
    	{
    		CloseHandle(m_hThreadRecv);
    	}
    
    	//创建接收数据线程
    	m_hThreadSend = CreateThread(NULL, 0, SendDataThread, this, 0, &ulThreadId);
    	if (NULL == m_hThreadSend)
    	{
    		return FALSE;
    	}
    	else
    	{
    		CloseHandle(m_hThreadSend);
    	}
    	return TRUE;
    }
    
    /*
    	接收客户端数据
    */
    DWORD CClient::RecvDataThread(void* pParam)
    {
    	CClient *pClient = (CClient*)pParam;  //客户端对象指针
    	int reVal;  //返回值
    	char temp[MAX_NUM_BUF];  //临时变量
    
    	memset(temp, 0, MAX_NUM_BUF);  
    
    	for (; pClient->m_bConning;)  //连接状态
    	{
    		reVal = recv(pClient->m_socket, temp, MAX_NUM_BUF, 0);  //接收数据
    
    		//处理错误返回值
    		if (SOCKET_ERROR == reVal)
    		{
    			int nErrCode = WSAGetLastError();
    			if (WSAEWOULDBLOCK == nErrCode)  //接受数据缓冲区不可用
    			{
    				continue;  //继续循环
    			}
    			else if (WSAENETDOWN == nErrCode   //客户端关闭了连接
    				|| WSAETIMEDOUT == nErrCode
    				|| WSAECONNRESET == nErrCode)
    			{
    				break; //线程退出
    			}
    		}
    
    		//客户端关闭了连接
    		if (reVal == 0)
    		{
    			break;
    		}
    		
    		//收到数据
    		if (reVal > HEADERLEN)
    		{
    			
    			pClient->HandleData(temp);  //处理数据
    			SetEvent(pClient->m_hEvent);  //通知发送数据线程
    			memset(temp, 0, MAX_NUM_BUF);  //清空临时变量
    		}
    
    		Sleep(TIMEFOR_THREAD_CLIENT);  //线程睡眠
    	}
    
    	pClient->m_bConning = FALSE; //与客户端的连接断开
    	SetEvent(pClient->m_hEvent); //通知发送数据线程退出
    
    	return 0; //退出
    }
    
    /*
    	计算表达式，打包数据
    */
    void CClient::HandleData(const char* pExpr)
    {
    	memset(m_data.buf, 0, MAX_NUM_BUF);//清空m_data
    
    	//如果"byebye" 或者 "Byebye"
    	if (BYEBYE == ((phdr)pExpr)->type)
    	{
    		EnterCriticalSection(&m_cs);
    
    		phdr pHeaderSend = (phdr)m_data.buf;  //发送的数据
    		pHeaderSend->type = BYEBYE;  //单词类型
    		pHeaderSend->len = HEADERLEN + strlen("OK"); //数据包长度
    		memcpy(m_data.buf + HEADERLEN, "OK", strlen("OK")); //复制数据到m_data
    		LeaveCriticalSection(&m_cs);
    	}
    	else
    	{//算数表达式
    		int nFirNum;  //第一个数字
    		int nSecNum;  //第二个数字
    		char cOper;  //算数运算符
    		int nResult; //计算结果
    
    		//格式化读入数据
    		
    		sscanf_s(pExpr + HEADERLEN, "%d%c%d", &nFirNum, &cOper,&nSecNum);
    		sscanf_s(pExpr + HEADERLEN, "%*d %*c %d", &nSecNum);
    
    		//计算
    		switch (cOper)
    		{
    		case '+':
    		{
    					nResult = nFirNum + nSecNum;
    					break;
    		}
    		case '-':
    		{
    					nResult = nFirNum - nSecNum;
    					break;
    		}
    		case '*':
    		{
    					nResult = nFirNum * nSecNum;
    					break;
    		}
    		case '/':
    		{
    					if (0 == nSecNum)  //无效的数字
    					{
    						nResult = -1;
    					}
    					else
    						nResult = nFirNum / nSecNum;
    					break;
    		}
    		default:
    			nResult = -1;  //无效的操作符
    			break;
    		}
    
    		//将算数表达式和计算的结果写入字符数组中
    		char temp[MAX_NUM_BUF];
    		char cEqu = '='; 
    		sprintf_s(temp, "%d%c%d%c%d", nFirNum, cOper, nSecNum, cEqu, nResult);
    
    		//打包数据
    		EnterCriticalSection(&m_cs);
    		phdr pHeaderSend = (phdr)m_data.buf;  //发送的数据
    		pHeaderSend->type = EXPRESSION; //数据类型为算数表达式
    		pHeaderSend->len = HEADERLEN + strlen(temp);  //数据包的长度
    		memcpy(m_data.buf + HEADERLEN, temp, strlen(temp));  //复制数据到m_data
    		
    
    		LeaveCriticalSection(&m_cs);
    	}
    }
    
    /*
    	向客户端发送数据
    */
    
    DWORD CClient::SendDataThread(void* pParam)
    {
    	CClient *pClient = (CClient*)pParam;  //转化数据类型为CClient指针
    
    	for (; pClient->m_bConning;) //连接状态
    	{
    		//收到事件通知 
    		if (WAIT_OBJECT_0 == WaitForSingleObject(pClient->m_hEvent, INFINITE))
    		{
    			//当客户端的连接断开时，接收数据线程先退出，然后该线程后退出，并设置退出标志
    			if (!pClient->m_bConning)
    			{
    				pClient->m_bExit = TRUE;
    				break;
    			}
    
    			//进入临界区
    			EnterCriticalSection(&pClient->m_cs);
    
    			//发送数据
    			phdr pHeader = (phdr)pClient->m_data.buf;
    			int nSendlen = pHeader->len;
    
    			
    			int val = send(pClient->m_socket, pClient->m_data.buf, nSendlen, 0);
    
    			//处理返回错误
    			if (SOCKET_ERROR == val)
    			{
    				int nErrCode = WSAGetLastError();
    				if (nErrCode == WSAEWOULDBLOCK)  //发送数据缓冲区不可用
    				{
    					continue;
    				}
    				else if (WSAENETDOWN == nErrCode
    					|| WSAETIMEDOUT == nErrCode
    					|| WSAECONNRESET == nErrCode) //客户端关闭了连接
    				{
    					//离开临界区
    					LeaveCriticalSection(&pClient->m_cs);
    					pClient->m_bConning = FALSE; //连接断开
    					pClient->m_bExit = TRUE;  //线程退出
    					break;
    				}
    				else
    				{
    					//离开临界区
    					LeaveCriticalSection(&pClient->m_cs);
    					pClient->m_bConning = FALSE;  //连接断开
    					pClient->m_bExit = TRUE;  //线程结束
    					break;
    				}
    			}
    			//成功发送数据
    			printf_s("Send()发送数据成功\n");
    			
    			//离开临界区
    			LeaveCriticalSection(&pClient->m_cs);
    			//设置事件为无信号状态
    			ResetEvent(&pClient->m_hEvent);
    		}
    	}
    	return 0;
    }

// ServerCounting.cpp : 远程算数  服务器
    //
    
    #include "stdafx.h"
    #include "winsock2.h" 
    #include "funtiondec.h"   //所需函数声明  
    #include <list>
    #include <string>
    using namespace std;
    
    
    HANDLE hThreadAccept;  //接受客户端连接线程句柄
    HANDLE hThreadHelp;  //释放资源线程句柄
    SOCKET sServer;   //监听套接字
    BOOL bServerRunning;  //服务器的工作状态
    HANDLE hServerEvent;  //服务器退出事件对象
    std::list<CClient*> clientlist;  //管理连接的链表                                                                  
    CRITICAL_SECTION  csClientList;  //保护链表的临界区对象
    
    /*
    	初始化全局变量
    */
    void InitMember(void)
    {
    	InitializeCriticalSection(&csClientList);  //初始化临界区  临界区对象在使用之前必须初始化，在使用完后删除
    	hServerEvent = CreateEvent(NULL, TRUE, FALSE, NULL); //手动设置事件，初始化为无信息状态
    	hThreadAccept = NULL;  
    	hThreadHelp = NULL;
    	sServer = INVALID_SOCKET;  //设置为无效的套接字
    	bServerRunning = FALSE;  //服务器为没有运行状态
    	clientlist.clear();  //清空链表
    }
    
    /*
    	初始化SOCKET
    */
    BOOL InitSocket(void)
    {
    	int reVal;  //返回值
    
    	//初始化Windows Sockets DLL
    	WSADATA wsData;
    	reVal = WSAStartup(MAKEWORD(2, 2), &wsData);
    	if (0 != reVal)
    	{
    		printf("Can not find a usable Windows Sockets dll!");
    		return FALSE;
    	}
    
    	//创建套接字
    	sServer = socket(AF_INET, SOCK_STREAM, 0);
    	if (INVALID_SOCKET == sServer)
    		return FALSE;
    
    	//设置套接字非阻塞模式
    	unsigned long u1 = 1;
    	reVal = ioctlsocket(sServer, FIONBIO, (unsigned long*)&u1);
    	if (SOCKET_ERROR == reVal)
    		return FALSE;
    
    	//绑定套接字
    	sockaddr_in  serAddr;
    	serAddr.sin_family = AF_INET;
    	serAddr.sin_port = htons(SERVERPORT);
    	serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
    
    	reVal = bind(sServer, (struct sockaddr*)&serAddr, sizeof(serAddr));
    	if (SOCKET_ERROR == reVal)
    		return FALSE;
    	
    	//监听
    	reVal = listen(sServer, SOMAXCONN);
    	if (SOCKET_ERROR == reVal)
    		return FALSE;
    	
    
    	return TRUE;
    }
    
    /*
    	启动服务
    */
    BOOL StartServer(void)
    {
    	BOOL reVal = TRUE;  // 返回值
    
    	printf("输入s 或 S\n");  //提示用户输入
    
    	char cInput;  //输入字符
    
    	do
    	{
    		scanf_s("%c", &cInput);
    		if ('s' == cInput || 'S' == cInput)
    		{
    			if (CreateHelperAndAcceptThread())  //创建清理资源和接受客户端请求的线程
    			{
    				//ShowServerStartMsg(TRUE);  //创建线程成功
    				printf("创建线程成功\n");
    			}
    			else
    			{
    				reVal = FALSE;
    			}
    				
    
    			break;  //跳出循环体
    		}
    		else
    		{
    			printf("输入正确!\n");
    		}
    
    	} while (cInput != 's' && cInput != 'S'); //必须输入's'或者'S'字符
    
    	return reVal;
    }
    
    /*
    	创建释放资源线程和接收客户端请求线程
    */
    BOOL CreateHelperAndAcceptThread(void)
    {
    	bServerRunning = TRUE;  //设置服务器为运行状态
    
    	//创建释放资源线程
    	unsigned long ulThreadId;
    	hThreadHelp = CreateThread(NULL, 0, HelperThread, NULL, 0, &ulThreadId);
    	if (NULL == hThreadHelp)
    	{
    		bServerRunning = FALSE;
    		return FALSE;
    	}
    	else
    	{
    		CloseHandle(hThreadHelp);
    	}
    
    	//创建接收客户端请求线程
    	hThreadAccept = CreateThread(NULL, 0, AcceptThread, NULL, 0, &ulThreadId);
    	if (NULL == hThreadAccept)
    	{
    		bServerRunning = FALSE;
    		return FALSE;
    	}
    	else
    	{
    		CloseHandle(hThreadAccept);
    	}
    	return TRUE;
    }
    
    /*
    	停止服务
    */
    void StopService(void)
    {
    	BOOL reVal = TRUE;  //返回值
    
    	printf("输入e 或 E\n");
    
    	char cInput;
    	for (; bServerRunning;)
    	{
    		scanf_s("%c", &cInput);
    		if (cInput == 'E' || cInput == 'e')
    		{
    			if (IDOK == MessageBox(NULL, _T("Are you sure?"),
    				_T("Server"), MB_OKCANCEL))  //等待用户确认
    				break;
    			else
    			{
    				Sleep(TIMEFOR_THREAD_EXIT);  //线程睡眠
    			}
    		}
    		else
    		{
    			Sleep(TIMEFOR_THREAD_EXIT);  //线程睡眠
    		}
    
    	}
    	bServerRunning = FALSE; //服务器退出
    
    	printf("服务器退出!\n");
    
    	Sleep(TIMEFOR_THREAD_EXIT);  //给其他线程时间退出
    
    	WaitForSingleObject(hServerEvent, INFINITE);//等待清理资源线程发送的事件
    	return;
    }
    
    /*
    	释放资源
    */
    void ExitServer(void)
    {
    	DeleteCriticalSection(&csClientList);  //释放临界区对象
    	CloseHandle(hServerEvent); //释放事件对象句柄
    	closesocket(sServer); //关闭SOCKET
    	WSACleanup(); //卸载Windowss Sockets DLL
    }
    
    /*
    	接受客户端请求
    */
    DWORD __stdcall AcceptThread(void* pParam)
    {
    	SOCKET sAccept; //接受客户端连接的套接字
    	sockaddr_in addrClient;  //客户端SOCKET地址
    
    	for (; bServerRunning;)  //服务器状态
    	{
    		memset(&addrClient, 0, sizeof(sockaddr_in));  //初始化
    		int lenClient = sizeof(sockaddr_in); //地址长度
    		sAccept = accept(sServer, (sockaddr*)&addrClient, &lenClient); //接受客户端请求
    
    		if (INVALID_SOCKET == sAccept)
    		{
    			
    			int nErrCode = WSAGetLastError();
    			if (nErrCode == WSAEWOULDBLOCK)  //无法立即完成一个非阻挡性套接字操作
    			{
    				Sleep(TIMEFOR_THREAD_SLEEP);
    				continue;  //继续等待
    			}
    			else
    			{
    				return 0;  //线程退出
    			}
    		}
    		else  //接受客户端的请求
    		{
    			printf_s("accept请求成功\n");
    			CClient* pClient = new CClient(sAccept, addrClient);  //创建客户端对象
    			EnterCriticalSection(&csClientList);  //进入在临界区
    			clientlist.push_back(pClient);  //加入链表
    			LeaveCriticalSection(&csClientList);  //离开临界区
    			
    			pClient->StartRuning();// 为接受的客户端建立接收数据和发送数据线程
    		}
    	}
    
    	return 0;  //线程退出
    }
    
    /*
    	清理资源
    */
    DWORD __stdcall HelperThread(void* pParam)
    {
    	for (; bServerRunning;)  //服务器正在运行
    	{
    		EnterCriticalSection(&csClientList);  //进入临界区
    
    		//清理已经断开的连接客户端内存空间
    
    		list<CClient*>::iterator iter = clientlist.begin();
    		for (iter; iter != clientlist.end();)
    		{
    			CClient *pClient = (CClient*)*iter;
    			if (pClient->IsExit())  //客户端线程已经退出
    			{
    				printf_s("客户端退出IP:%s\n", pClient->Getm_addr());
    				clientlist.erase(iter++);  //删除节点
    				delete pClient;  //释放内存
    				pClient = NULL;
    			}
    			else
    			{
    				iter++;  //指针下移
    			}
    		}
    
    		LeaveCriticalSection(&csClientList);  //离开临界区
    
    		Sleep(TIMEFOR_THREAD_HELP);
    	}
    
    	//服务器停止工作
    	if (!bServerRunning)
    	{
    		//断开每个连接，线程退出
    		EnterCriticalSection(&csClientList);
    		list<CClient*>::iterator iter = clientlist.begin();
    		for (iter; iter != clientlist.end();)
    		{
    			CClient *pClient = (CClient*)*iter;
    			//如果客户端的连接还存在，则断开连接，线程退出
    			if (pClient->IsConning())
    			{
    				pClient->DisConning();
    			}
    			++iter;
    		}
    
    		//离开临界区
    		LeaveCriticalSection(&csClientList);
    
    		//给连接客户端线程时间，使其自动退出
    		Sleep(TIMEFOR_THREAD_SLEEP);
    
    		//进入临界区
    		EnterCriticalSection(&csClientList);
    		
    		//确保为每个客户端分配的内存空间都回收
    		//如果不假如while 这层循环，可能存在这样的情况，当pClient->IsExit()时
    		//该线程还没有退出
    		//那么就需要从链表的开始部分重新判断。
    
    		while (0 != clientlist.size())
    		{
    			iter = clientlist.begin();
    			for (iter; iter != clientlist.end();)
    			{
    				CClient *pClient = (CClient*)*iter;
    				if (pClient->IsExit())  //客户端线程已经退出
    				{
    					clientlist.erase(iter++); //删除节点
    					delete pClient;  //释放内存空间
    					pClient = NULL;
    				}
    				else
    				{
    					iter++; //指针下移
    				}
    
    			}
    			//给连接客户端线程时间，使其自动退出
    			Sleep(TIMEFOR_THREAD_SLEEP);
    		}
    		LeaveCriticalSection(&csClientList);  //离开临界区
    	}
    
    	clientlist.clear(); //情况链表
    
    	SetEvent(hServerEvent);  //通知主线程退出
    
    	return 0;
    }
    
    int _tmain(int argc, _TCHAR* argv[])
    {
    
    	//初始化全局变量
    	InitMember();
    
    	//初始化服务器
    	if (!InitSocket())
    	{
    		printf("初始化服务器失败\n");
    		ExitServer();
    		return SERVER_SETUP_FAIL;
    	}
    
    	//启动服务
    	if (!StartServer())
    	{
    		printf("启动服务器失败\n");
    		ExitServer();
    		return SERVER_SETUP_FAIL;
    
    	}
    
    	printf("stop\n");
    	//停止服务
    	StopService();
    
    	//服务器退出
    	ExitServer();
    
    	return 0;
    }