C++ 简单的 Tcp 实现[socket] 服务器端与客户端通信



http://blog.csdn.net/guoguojune/archive/2011/02/15/6185301.aspx（原文的格式看着真叫一个舒服）
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;