C++ 简单的 Tcp 实现[socket] 客户端与客户端通信

开发环境 Vs 2008 新建一个win32 console project

// 服务器端代码

// Server.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "winsock2.h"
#pragma comment(lib, "ws2_32.lib")

#include <iostream>
using namespace std;

int _tmain(int argc, char* argv[])
{
	const int BUF_SIZE = 64;

	WSADATA			wsd;			//WSADATA变量
	SOCKET			sServer;		//服务器套接字
	SOCKET			sClient;		//客户端套接字
	SOCKADDR_IN		addrServ;;		//服务器地址
	char			buf[BUF_SIZE];	//接收数据缓冲区
	char			sendBuf[BUF_SIZE];//返回给客户端得数据
	int				retVal;			//返回值

	//初始化套结字动态库
	if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
	{
		cout << "WSAStartup failed!" << endl;
		return 1;
	}
	
	//创建套接字
	sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);	
	if(INVALID_SOCKET == sServer)
	{
		cout << "socket failed!" << endl;
		WSACleanup();//释放套接字资源;
		return  -1;
	}
	
	//服务器套接字地址 
	addrServ.sin_family = AF_INET;
	addrServ.sin_port = htons(4999);
	addrServ.sin_addr.s_addr = INADDR_ANY;		
	//绑定套接字
	retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));

	if(SOCKET_ERROR == retVal)
	{	
		cout << "bind failed!" << endl;
		closesocket(sServer);	//关闭套接字
		WSACleanup();			//释放套接字资源;
		return -1;
	}
	
	//开始监听 
	retVal = listen(sServer, 1);
	if(SOCKET_ERROR == retVal)
	{
		cout << "listen failed!" << endl;		
		closesocket(sServer);	//关闭套接字
		WSACleanup();			//释放套接字资源;
		return -1;
	}
	
	//接受客户端请求
	sockaddr_in addrClient;
	int addrClientlen = sizeof(addrClient);
	sClient = accept(sServer,(sockaddr FAR*)&addrClient, &addrClientlen);
	if(INVALID_SOCKET == sClient)
	{
		cout << "accept failed!" << endl;		
		closesocket(sServer);	//关闭套接字
		WSACleanup();			//释放套接字资源;
		return -1;
	}

	
	while(true){
		//接收客户端数据
		ZeroMemory(buf, BUF_SIZE);
		retVal = recv(sClient, buf, BUF_SIZE, 0);
		if (SOCKET_ERROR == retVal)
		{
			cout << "recv failed!" << endl;		
			closesocket(sServer);	//关闭套接字
			closesocket(sClient);	//关闭套接字		
			WSACleanup();			//释放套接字资源;
			return -1;
		}
		if(buf[0] == '0')
			break;
		cout << "客户端发送的数据: " << buf <<endl;
		
		cout << "向客户端发送数据: " ;
		cin >> sendBuf;
		
		send(sClient, sendBuf, strlen(sendBuf), 0);
	}
	
	//退出
	closesocket(sServer);	//关闭套接字
	closesocket(sClient);	//关闭套接字
	WSACleanup();			//释放套接字资源;

	
	return 0;
}

// 客户端代码

// Client.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "winsock2.h"
#include <iostream>
#pragma comment(lib, "ws2_32.lib")

using namespace std;
BOOL	RecvLine(SOCKET s, char* buf);	//读取一行数据

int main(int argc, char* argv[])
{
	const int BUF_SIZE = 64;

	WSADATA			wsd;			//WSADATA变量
	SOCKET			sHost;			//服务器套接字
	SOCKADDR_IN		servAddr;		//服务器地址
	char			buf[BUF_SIZE];	//接收数据缓冲区
	char			bufRecv[BUF_SIZE];
	int				retVal;			//返回值
	
	//初始化套结字动态库
	if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
	{
		cout << "WSAStartup failed!" << endl;
		return -1;
	}
	
	//创建套接字
	sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);	
	if(INVALID_SOCKET == sHost)
	{
		cout << "socket failed!" << endl;
		WSACleanup();//释放套接字资源
		return  -1;
	}

	//设置服务器地址
	servAddr.sin_family =AF_INET;
	servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
	servAddr.sin_port = htons((short)4999);
	int	nServAddlen  = sizeof(servAddr);

	//连接服务器
	retVal=connect(sHost,(LPSOCKADDR)&servAddr, sizeof(servAddr));	
	if(SOCKET_ERROR == retVal)
	{
		cout << "connect failed!" << endl;	
		closesocket(sHost);	//关闭套接字
		WSACleanup();		//释放套接字资源
		return -1;
	}
	while(true){
		//向服务器发送数据
		ZeroMemory(buf, BUF_SIZE);
		cout << " 向服务器发送数据:  ";
		cin >> buf;
		retVal = send(sHost, buf, strlen(buf), 0);
		if (SOCKET_ERROR == retVal)
		{
			cout << "send failed!" << endl;
			closesocket(sHost);	//关闭套接字
			WSACleanup();		//释放套接字资源
			return -1;
		}
		//RecvLine(sHost, bufRecv);
		recv(sHost, bufRecv,5 , 0);		// 接收服务器端的数据， 只接收5个字符
		cout << endl <<"从服务器接收数据：" << bufRecv;

	}
	//退出
	closesocket(sHost);	//关闭套接字
	WSACleanup();		//释放套接字资源
	return 0;
}