服务器端代码：

// socketTest.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include <iostream>
#include <winsock.h>#pragma  comment (lib,"ws2_32.lib")
#define  MAXBUFLEN 256
#define  PORT 44965using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{WSADATA Data;SOCKADDR_IN serverSockAddr;SOCKADDR_IN clientSockAddr;SOCKET serversocket;  //其实就是一个unsig int类型，用来记录已经建立或者尚未建立的套接字号SOCKET clientsocket;int addrlen = sizeof(SOCKADDR_IN);   //16int status;int numrcv;char buffer[MAXBUFLEN];//初始化windows Socket Dllstatus = WSAStartup(MAKEWORD(1,1),&Data);if (0!=status){cout<<"初始化失败"<<endl;}//清0memset(&serverSockAddr,0,sizeof(serverSockAddr));//初始化serverSockAddr.sin_port = htons(PORT);serverSockAddr.sin_family = AF_INET;    //指定地址协议族serverSockAddr.sin_addr.s_addr = htonl(INADDR_ANY);  //初始化ip地址0,0,0,0 任何ip都可以连接//创建套接字serversocket = socket(AF_INET,SOCK_STREAM/*套接字类型*/,0/*套接字使用的特定协议*/);if (INVALID_SOCKET == serversocket){cout<<"创建socket失败"<<endl;}//绑定socket到特定地址(结构体地址)status = bind(serversocket,(LPSOCKADDR)&serverSockAddr,sizeof(serverSockAddr));if (SOCKET_ERROR==status){cout<<"绑定地址失败"<<endl;}//允许外来申请链接请求，或者说就是监听status = listen(serversocket/*套接字号*/,2/*最大容许链接的套接字个数*/);if (SOCKET_ERROR == status){cout<<"监听失败"<<endl;}//当有请求申请是就接受链接请求clientsocket = accept(serversocket,(LPSOCKADDR)&clientsocket,&addrlen);while(1){numrcv = recv(clientsocket/*已经建立的套接字*/,buffer/*接受输入数据缓冲器的指针*/,MAXBUFLEN/*接受缓冲区大小*/,0/*传输控制方式*/);if ((0==numrcv)||(numrcv==SOCKET_ERROR)){cout<<"链接受到限制"<<endl;status = closesocket(clientsocket);if (SOCKET_ERROR==status)cout<<"断开链接失败"<<endl;status = WSACleanup();if (SOCKET_ERROR==status)cout<<"清理链接失败"<<endl;return(1);}cout<<"接受到客户端发过来的消息内容是："<<buffer<<endl;cout<<"输入想要发送给客户端发送的消息内容并按回车发送"<<endl;int numsnt;char *toSendtxt=new char[256];cin>>toSendtxt;numsnt=send(clientsocket, toSendtxt, strlen(toSendtxt) + 1, 0);if (numsnt != (int)strlen(toSendtxt) + 1){cout << "Connection terminated" << endl;status=closesocket(clientsocket);if (status == SOCKET_ERROR)cout<< "ERROR: closesocket unsuccessful" << endl;status=WSACleanup();if (status == SOCKET_ERROR)cout<< "ERROR: WSACleanup unsuccessful" << endl;return(1);}cout<<"等待继续接受客户端发来的消息.........."<<endl;}return 0;
}/*总结通信服务器端，建立一个socket通信，        socket()绑定这个socket到地址结构体，bind()监听外来申请建立链接请求,   listen() 接受外来申请的链接请求,     accept()接受客户端发来的消息内容，  recv()向客户端发送消息，          send()
*/

客户端代码：

// socketclientTest.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include <iostream>#include <winsock.h>#pragma comment(lib,"ws2_32.lib")#define  MAXBUFLEN 256
#define PORT 44965
#define DEST_IP_ADDR "127.0.0.1" //想要链接的目标Server addressusing namespace std;
int _tmain(int argc, _TCHAR* argv[])
{WSADATA Data;SOCKADDR_IN destSockAddr;SOCKET destSocket;unsigned long destAddr;int status;/* initialize the Windows Socket DLL */status=WSAStartup(MAKEWORD(1, 1), &Data);if (status != 0)cout<< "ERROR: WSAStartup unsuccessful"<<endl;/* convert IP address into in_addr form */destAddr=inet_addr(DEST_IP_ADDR);/* copy destAddr into sockaddr_in structure */memcpy(&destSockAddr.sin_addr, &destAddr, sizeof(destAddr));/* specify the port portion of the address */destSockAddr.sin_port=htons(PORT);/* specify the address family as Internet */destSockAddr.sin_family=AF_INET;/* create a socket */destSocket=socket(AF_INET, SOCK_STREAM, 0);if (destSocket == INVALID_SOCKET){cout<< "ERROR: socket unsuccessful" << endl;status=WSACleanup();if (status == SOCKET_ERROR)cout<< "ERROR: WSACleanup unsuccessful" << endl;return(1);}cout<< "Trying to connect to IP Address: " << DEST_IP_ADDR <<endl;/* connect to the server */status=connect(destSocket, (LPSOCKADDR)&destSockAddr, sizeof(destSockAddr));if (status == SOCKET_ERROR){cout<< "ERROR: connect unsuccessful" << endl;status=closesocket(destSocket);if (status == SOCKET_ERROR)cout<< "ERROR: closesocket unsuccessful"<< endl;status=WSACleanup();if (status == SOCKET_ERROR)cout<< "ERROR: WSACleanup unsuccessful"<< endl;return(1);}cout << "Connected..." << endl;while(1){int numsnt;char *toSendtxt=new char[256];cout << "输入想要发送给服务器的消息内容并按回车发送:" << endl;cin>>toSendtxt;numsnt=send(destSocket, toSendtxt, strlen(toSendtxt) + 1, 0);if (numsnt != (int)strlen(toSendtxt) + 1){cout << "Connection terminated" << endl;status=closesocket(destSocket);if (status == SOCKET_ERROR)cout<< "ERROR: closesocket unsuccessful" << endl;status=WSACleanup();if (status == SOCKET_ERROR)cout<< "ERROR: WSACleanup unsuccessful" << endl;return(1);}/* Wait before sending the message again */cout<<"向服务器发送的消息已经成功发送现在等待接受服务器发来的消息......"<<endl;int numrcv;char buffer[MAXBUFLEN];numrcv = recv(destSocket/*已经建立的套接字*/,buffer/*接受输入数据缓冲器的指针*/,MAXBUFLEN/*接受缓冲区大小*/,0/*传输控制方式*/);if ((0==numrcv)||(numrcv==SOCKET_ERROR)){cout<<"链接受到限制"<<endl;status = closesocket(destSocket);if (SOCKET_ERROR==status)cout<<"断开链接失败"<<endl;status = WSACleanup();if (SOCKET_ERROR==status)cout<<"清理链接失败"<<endl;return(1);}cout<<"服务器发来的消息内容是："<<buffer<<endl;} /* while */return 0;
}/*总结通信客户端，  建立一个socket通信，          socket()链接目标服务器端，            connect()向服务器发送消息，            send()接受服务器端发来的消息内容，  recv()*/