解决粘包问题server/client

#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
		//启动Windows socket 2.x环境
		WORD ver = MAKEWORD(2, 2);
		WSADATA dat;
		WSAStartup(ver, &dat);
#endif
		if (INVALID_SOCKET != _sock)
		{
			printf("<socket=%d>关闭旧连接...\n", _sock);
			Close();
		}
		_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (INVALID_SOCKET == _sock)
		{
			printf("错误，建立Socket失败...\n");
		}
		else {
			printf("建立Socket=<%d>成功...\n", _sock);
		}
	}

//连接服务器
	int Connect(const char* ip, unsigned short port)
	{
		if (INVALID_SOCKET == _sock)
		{
			InitSocket();
		}
		// 2 连接服务器 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
		printf("<socket=%d>正在连接服务器<%s:%d>...\n", _sock, ip, port);
		int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
		if (SOCKET_ERROR == ret)
		{
			printf("<socket=%d>错误，连接服务器<%s:%d>失败...\n", _sock, ip, port);
		}
		else {
			printf("<socket=%d>连接服务器<%s:%d>成功...\n", _sock, ip, port);
		}
		return ret;
	}

//关闭套节字closesocket
	void Close()
	{
		if (_sock != INVALID_SOCKET)
		{
#ifdef _WIN32
			closesocket(_sock);
			//清除Windows socket环境
			WSACleanup();
#else
			close(_sock);
#endif
			_sock = INVALID_SOCKET;
		}
	}

//处理网络消息
	int _nCount = 0;
	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);
			//printf("select ret=%d count=%d\n", ret, _nCount++);
			if (ret < 0)
			{
				printf("<socket=%d>select任务结束1\n", _sock);
				Close();
				return false;
			}
			if (FD_ISSET(_sock, &fdReads))
			{
				FD_CLR(_sock, &fdReads);

if (-1 == RecvData(_sock))
				{
					printf("<socket=%d>select任务结束2\n", _sock);
					Close();
					return false;
				}
			}
			return true;
		}
		return false;
	}

//是否工作中
	bool isRun()
	{
		return _sock != INVALID_SOCKET;
	}
	//缓冲区最小单元大小
#ifndef RECV_BUFF_SZIE
#define RECV_BUFF_SZIE 102400
#endif // !RECV_BUFF_SZIE
	//第二缓冲区 消息缓冲区
	char _szMsgBuf[RECV_BUFF_SZIE * 10] = {};
	//消息缓冲区的数据尾部位置
	int _lastPos = 0;
	//接收缓冲区
	char _szRecv[RECV_BUFF_SZIE] = {};

//接收数据 处理粘包 拆分包
	int RecvData(SOCKET cSock)
	{
		// 5 接收数据
		int nLen = (int)recv(cSock, _szRecv, RECV_BUFF_SZIE, 0);
		//printf("nLen=%d\n", nLen);
		if (nLen <= 0)
		{
			printf("<socket=%d>与服务器断开连接，任务结束。\n", cSock);
			return -1;
		}
		//将收取到的数据拷贝到消息缓冲区
		memcpy(_szMsgBuf + _lastPos, _szRecv, nLen);
		//消息缓冲区的数据尾部位置后移
		_lastPos += nLen;
		//判断消息缓冲区的数据长度大于消息头DataHeader长度
		while (_lastPos >= sizeof(DataHeader))
		{
			//这时就可以知道当前消息的长度
			DataHeader* header = (DataHeader*)_szMsgBuf;
			//判断消息缓冲区的数据长度大于消息长度
			if (_lastPos >= header->dataLength)
			{
				//消息缓冲区剩余未处理数据的长度
				int nSize = _lastPos - header->dataLength;
				//处理网络消息
				OnNetMsg(header);
				//将消息缓冲区剩余未处理数据前移
				memcpy(_szMsgBuf, _szMsgBuf + header->dataLength, nSize);
				//消息缓冲区的数据尾部位置前移
				_lastPos = nSize;
			}
			else {
				//消息缓冲区剩余数据不够一条完整消息
				break;
			}
		}
		return 0;
	}

//响应网络消息
	virtual void OnNetMsg(DataHeader* header)
	{
		switch (header->cmd)
		{
		case CMD_LOGIN_RESULT:
		{

LoginResult* login = (LoginResult*)header;
			//printf("<socket=%d>收到服务端消息：CMD_LOGIN_RESULT,数据长度：%d\n", _sock, login->dataLength);
		}
		break;
		case CMD_LOGOUT_RESULT:
		{
			LogoutResult* logout = (LogoutResult*)header;
			//printf("<socket=%d>收到服务端消息：CMD_LOGOUT_RESULT,数据长度：%d\n", _sock, logout->dataLength);
		}
		break;
		case CMD_NEW_USER_JOIN:
		{
			NewUserJoin* userJoin = (NewUserJoin*)header;
			//printf("<socket=%d>收到服务端消息：CMD_NEW_USER_JOIN,数据长度：%d\n", _sock, userJoin->dataLength);
		}
		break;
		case CMD_ERROR:
		{
			printf("<socket=%d>收到服务端消息：CMD_ERROR,数据长度：%d\n", _sock, header->dataLength);
		}
		break;
		default:
		{
			printf("<socket=%d>收到未定义消息,数据长度：%d\n", _sock, header->dataLength);
		}
		}
	}

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

};

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

bool g_bRun = true;
void cmdThread()
{
	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 {
			printf("不支持的命令。\n");
		}
	}
}

int main()
{
	const int cCount = FD_SETSIZE - 1;
	EasyTcpClient* client[cCount];

for (int n = 0; n < cCount; n++)
	{
		client[n] = new EasyTcpClient();
	}
	for (int n = 0; n < cCount; n++)
	{
		client[n]->Connect("192.168.145.132", 4568);
	}

//启动UI线程
	std::thread t1(cmdThread);
	t1.detach();

Login login;
	strcpy(login.userName, "lyd");
	strcpy(login.PassWord, "lydmm");
	while (g_bRun)
	{
		for (int n = 0; n < cCount; n++)
		{
			client[n]->SendData(&login);
			client[n]->OnRun();
		}

//printf("空闲时间处理其它业务..\n");
		//Sleep(1000);
	}

for (int n = 0; n < cCount; n++)
	{
		client[n]->Close();
	}

printf("已退出。\n");
	getchar();
	return 0;
}
----------------------------------------------
#ifndef _EasyTcpServer_hpp_
#define _EasyTcpServer_hpp_

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#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<vector>
#include"MessageHeader.hpp"

//缓冲区最小单元大小
#ifndef RECV_BUFF_SZIE
#define RECV_BUFF_SZIE 102400
#endif // !RECV_BUFF_SZIE

class ClientSocket
{
public:
	ClientSocket(SOCKET sockfd = INVALID_SOCKET)
	{
		_sockfd = sockfd;
		memset(_szMsgBuf, 0, sizeof(_szMsgBuf));
		_lastPos = 0;
	}

SOCKET sockfd()
	{
		return _sockfd;
	}

char* msgBuf()
	{
		return _szMsgBuf;
	}

int getLastPos()
	{
		return _lastPos;
	}
	void setLastPos(int pos)
	{
		_lastPos = pos;
	}
private:
	// socket fd_set  file desc set
	SOCKET _sockfd;
	//第二缓冲区 消息缓冲区
	char _szMsgBuf[RECV_BUFF_SZIE * 10];
	//消息缓冲区的数据尾部位置
	int _lastPos;
};

class EasyTcpServer
{
private:
	SOCKET _sock;
	std::vector<ClientSocket*> _clients;
public:
	EasyTcpServer()
	{
		_sock = INVALID_SOCKET;
	}
	virtual ~EasyTcpServer()
	{
		Close();
	}
	//初始化Socket
	SOCKET InitSocket()
	{
#ifdef _WIN32
		//启动Windows socket 2.x环境
		WORD ver = MAKEWORD(2, 2);
		WSADATA dat;
		WSAStartup(ver, &dat);
#endif
		if (INVALID_SOCKET != _sock)
		{
			printf("<socket=%d>关闭旧连接...\n", (int)_sock);
			Close();
		}
		_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (INVALID_SOCKET == _sock)
		{
			printf("错误，建立socket失败...\n");
		}
		else {
			printf("建立socket=<%d>成功...\n", (int)_sock);
		}
		return _sock;
	}

//绑定IP和端口号
	int Bind(const char* ip, unsigned short port)
	{
		//if (INVALID_SOCKET == _sock)
		//{
		//	InitSocket();
		//}
		// 2 bind 绑定用于接受客户端连接的网络端口
		sockaddr_in _sin = {};
		_sin.sin_family = AF_INET;
		_sin.sin_port = htons(port);//host to net unsigned short

#ifdef _WIN32
		if (ip) {
			_sin.sin_addr.S_un.S_addr = inet_addr(ip);
		}
		else {
			_sin.sin_addr.S_un.S_addr = INADDR_ANY;
		}
#else
		if (ip) {
			_sin.sin_addr.s_addr = inet_addr(ip);
		}
		else {
			_sin.sin_addr.s_addr = INADDR_ANY;
		}
#endif
		int ret = bind(_sock, (sockaddr*)&_sin, sizeof(_sin));
		if (SOCKET_ERROR == ret)
		{
			printf("错误,绑定网络端口<%d>失败...\n", port);
		}
		else {
			printf("绑定网络端口<%d>成功...\n", port);
		}
		return ret;
	}

//监听端口号
	int Listen(int n)
	{
		// 3 listen 监听网络端口
		int ret = listen(_sock, n);
		if (SOCKET_ERROR == ret)
		{
			printf("socket=<%d>错误,监听网络端口失败...\n", _sock);
		}
		else {
			printf("socket=<%d>监听网络端口成功...\n", _sock);
		}
		return ret;
	}

//接受客户端连接
	SOCKET Accept()
	{
		// 4 accept 等待接受客户端连接
		sockaddr_in clientAddr = {};
		int nAddrLen = sizeof(sockaddr_in);
		SOCKET cSock = INVALID_SOCKET;
#ifdef _WIN32
		cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
#else
		cSock = accept(_sock, (sockaddr*)&clientAddr, (socklen_t*)&nAddrLen);
#endif
		if (INVALID_SOCKET == cSock)
		{
			printf("socket=<%d>错误,接受到无效客户端SOCKET...\n", (int)_sock);
		}
		else
		{
			NewUserJoin userJoin;
			SendDataToAll(&userJoin);
			_clients.push_back(new ClientSocket(cSock));
			printf("socket=<%d>新客户端加入：socket = %d,IP = %s \n", (int)_sock, (int)cSock, inet_ntoa(clientAddr.sin_addr));
		}
		return cSock;
	}

//关闭Socket
	void Close()
	{
		if (_sock != INVALID_SOCKET)
		{
#ifdef _WIN32
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				closesocket(_clients[n]->sockfd());
				delete _clients[n];
			}
			// 8 关闭套节字closesocket
			closesocket(_sock);
			//------------
			//清除Windows socket环境
			WSACleanup();
#else
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				close(_clients[n]->sockfd());
				delete _clients[n];
			}
			// 8 关闭套节字closesocket
			close(_sock);
#endif
			_clients.clear();
		}
	}
	//处理网络消息
	int _nCount = 0;
	bool OnRun()
	{
		if (isRun())
		{
			//伯克利套接字 BSD socket
			fd_set fdRead;//描述符（socket） 集合
			fd_set fdWrite;
			fd_set fdExp;
			//清理集合
			FD_ZERO(&fdRead);
			FD_ZERO(&fdWrite);
			FD_ZERO(&fdExp);
			//将描述符（socket）加入集合
			FD_SET(_sock, &fdRead);
			FD_SET(_sock, &fdWrite);
			FD_SET(_sock, &fdExp);
			SOCKET maxSock = _sock;
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				FD_SET(_clients[n]->sockfd(), &fdRead);
				if (maxSock < _clients[n]->sockfd())
				{
					maxSock = _clients[n]->sockfd();
				}
			}
			///nfds 是一个整数值 是指fd_set集合中所有描述符(socket)的范围，而不是数量
			///既是所有文件描述符最大值+1 在Windows中这个参数可以写0
			timeval t = { 1,0 };
			int ret = select(maxSock + 1, &fdRead, &fdWrite, &fdExp, &t); //
			//printf("select ret=%d count=%d\n", ret, _nCount++);
			if (ret < 0)
			{
				printf("select任务结束。\n");
				Close();
				return false;
			}
			//判断描述符（socket）是否在集合中
			if (FD_ISSET(_sock, &fdRead))
			{
				FD_CLR(_sock, &fdRead);
				Accept();
			}
			for (int n = (int)_clients.size() - 1; n >= 0; n--)
			{
				if (FD_ISSET(_clients[n]->sockfd(), &fdRead))
				{
					if (-1 == RecvData(_clients[n]))
					{
						auto iter = _clients.begin() + n;//std::vector<SOCKET>::iterator
						if (iter != _clients.end())
						{
							delete _clients[n];
							_clients.erase(iter);
						}
					}
				}
			}
			return true;
		}
		return false;

}
	//是否工作中
	bool isRun()
	{
		return _sock != INVALID_SOCKET;
	}
	//缓冲区
	char _szRecv[RECV_BUFF_SZIE] = {};

//接收数据 处理粘包 拆分包
	int RecvData(ClientSocket* pClient)
	{
		// 5 接收客户端数据
		int nLen = (int)recv(pClient->sockfd(), _szRecv, RECV_BUFF_SZIE, 0);
		//printf("nLen=%d\n", nLen);
		if (nLen <= 0)
		{
			printf("客户端<Socket=%d>已退出，任务结束。\n", pClient->sockfd());
			return -1;
		}
		//将收取到的数据拷贝到消息缓冲区
		memcpy(pClient->msgBuf() + pClient->getLastPos(), _szRecv, nLen);
		//消息缓冲区的数据尾部位置后移
		pClient->setLastPos(pClient->getLastPos() + nLen);

//判断消息缓冲区的数据长度大于消息头DataHeader长度
		while (pClient->getLastPos() >= sizeof(DataHeader))
		{
			//这时就可以知道当前消息的长度
			DataHeader* header = (DataHeader*)pClient->msgBuf();
			//判断消息缓冲区的数据长度大于消息长度
			if (pClient->getLastPos() >= header->dataLength)
			{
				//消息缓冲区剩余未处理数据的长度
				int nSize = pClient->getLastPos() - header->dataLength;
				//处理网络消息
				OnNetMsg(pClient->sockfd(), header);
				//将消息缓冲区剩余未处理数据前移
				memcpy(pClient->msgBuf(), pClient->msgBuf() + header->dataLength, nSize);
				//消息缓冲区的数据尾部位置前移
				pClient->setLastPos(nSize);
			}
			else {
				//消息缓冲区剩余数据不够一条完整消息
				break;
			}
		}
		return 0;
	}
	//响应网络消息
	virtual void OnNetMsg(SOCKET cSock, DataHeader* header)
	{
		switch (header->cmd)
		{
		case CMD_LOGIN:
		{

Login* login = (Login*)header;
			//printf("收到客户端<Socket=%d>请求：CMD_LOGIN,数据长度：%d,userName=%s PassWord=%s\n", cSock, login->dataLength, login->userName, login->PassWord);
			//忽略判断用户密码是否正确的过程
			LoginResult ret;
			SendData(cSock, &ret);
		}
		break;
		case CMD_LOGOUT:
		{
			Logout* logout = (Logout*)header;
			//printf("收到客户端<Socket=%d>请求：CMD_LOGOUT,数据长度：%d,userName=%s \n", cSock, logout->dataLength, logout->userName);
			//忽略判断用户密码是否正确的过程
			LogoutResult ret;
			SendData(cSock, &ret);
		}
		break;
		default:
		{
			printf("<socket=%d>收到未定义消息,数据长度：%d\n", cSock, header->dataLength);
			//DataHeader ret;
			//SendData(cSock, &ret);
		}
		break;
		}
	}

//发送指定Socket数据
	int SendData(SOCKET cSock, DataHeader* header)
	{
		if (isRun() && header)
		{
			return send(cSock, (const char*)header, header->dataLength, 0);
		}
		return SOCKET_ERROR;
	}

void SendDataToAll(DataHeader* header)
	{
		for (int n = (int)_clients.size() - 1; n >= 0; n--)
		{
			SendData(_clients[n]->sockfd(), header);
		}
	}

};

#endif // !_EasyTcpServer_hpp_

-------------------------------------------------
#include "EasyTcpServer.hpp"
#include<thread>

bool g_bRun = true;
void cmdThread()
{
	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 {
			printf("不支持的命令。\n");
		}
	}
}

int main()
{

EasyTcpServer server;
	server.InitSocket();
	server.Bind(nullptr, 4568);
	server.Listen(5);

//启动UI线程
	std::thread t1(cmdThread);
	t1.detach();

while (g_bRun)
	{
		server.OnRun();
		//printf("空闲时间处理其它业务..\n");
	}
	server.Close();
	printf("已退出。\n");
	getchar();
	return 0;
}
----------------------------------------------------
enum CMD
{
	CMD_LOGIN,
	CMD_LOGIN_RESULT,
	CMD_LOGOUT,
	CMD_LOGOUT_RESULT,
	CMD_NEW_USER_JOIN,
	CMD_ERROR
};

struct DataHeader
{
	DataHeader() {
		dataLength = sizeof(DataHeader);
		cmd = CMD_ERROR;
	}
	short dataLength;
	short cmd;
};

//DataPackage
struct Login : public DataHeader
{
	Login()
	{
		dataLength = sizeof(Login);
		cmd = CMD_LOGIN;
	}
	char userName[32];
	char PassWord[32];
	char data[932];
};

struct LoginResult : public DataHeader
{
	LoginResult()
	{
		dataLength = sizeof(LoginResult);
		cmd = CMD_LOGIN_RESULT;
		result = 0;
	}
	int result;
	char data[992];
};

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;
};

简锋/服务器编程

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