windows socket编程实现两台电脑间的通信

首先需要两台电脑，可以两个同学共同来完成；当然，如果自己有两台电脑的话就更好了！

在一台电脑上创建一个TCP Socket服务器应用程序

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <WinSock2.h>
#include <stdlib.h>


#pragma comment (lib,"WS2_32.lib");
#define BUF_SIZE 64


int main()
{
WSADATA wsd;         //WSADATA变量，用于初始化Windows Socket 
SOCKET sServer;     //服务器socket，用于监听客户端请求
SOCKET sClient;     //客户端socket，用于实现与客户端的通信
int retVal;         //调用各种socket函数的返回值
char buf[BUF_SIZE];


//初始化Socket环境
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
{
//printf("WASStartup failed !\n");
std::cout << "WASStartup failed !" << std::endl;
return 1;
}


//创建用于监听的Socket
sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sServer == INVALID_SOCKET)
{
//printf("socket failed !\n");
std::cout << "socket failed !" << std::endl;
return -1;
}


//设置服务器Socket地址
SOCKADDR_IN addrServ;
addrServ.sin_family = AF_INET;
addrServ.sin_port = htons(9990);
addrServ.sin_addr.S_un.S_addr = htons(INADDR_ANY);


//绑定Sockets Server 到本地地址
retVal = bind(sServer, (const struct sockaddr *)&addrServ, sizeof(SOCKADDR_IN));
if (SOCKET_ERROR == retVal)
{
std::cout << "bind failed !" << std::endl;
closesocket(sServer);
WSACleanup();
return -1;
}


//在Socket Server上进行监听
retVal = listen(sServer,1);
if (SOCKET_ERROR==retVal)
{
std::cout << "listen failed !" << std::endl;
closesocket(sServer);
WSACleanup();
return -1;
}




//接受来自客户端的请求
std::cout << "TCP Server Start..." << std::endl;
sockaddr_in addrClient;    //客户端地址
int addrClientLen = sizeof(addrClient);
sClient = accept(sServer, (sockaddr FAR *)&addrClient, &addrClientLen);
if (INVALID_SOCKET == sClient)
{
std::cout << "accept failed !" << std::endl;
closesocket(sServer);
WSACleanup();
return -1;
}




//在服务器与客户端之间发送和接收数据


//循环接受客户端的数据，直接客户端发送quit命令后退出
while (true)
{
memset(buf, 0, BUF_SIZE);
retVal = recv(sClient, buf, BUF_SIZE, 0);
if (SOCKET_ERROR == retVal)
{
std::cout << "recv failed !" << std::endl;
closesocket(sServer);
WSACleanup();
return -1;
}
//获取当前系统时间
SYSTEMTIME st;
GetLocalTime(&st);
char sDataTime[30];
sprintf(sDataTime, "%4d-%2d-%2d %2d:%2d:%2d", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
//打印输出信息
std::cout << sDataTime << "Recv from Client [" << inet_ntoa(addrClient.sin_addr) << ":";
std::cout << addrClient.sin_port << "] : " << buf << std::endl;


//如果客户端发送“quit”字符串，则服务器退出
if (strcmp(buf, "quit") == 0)
{
retVal = send(sClient, "quit", strlen("quit"), 0);
break;
}
//否则向客户端发送回显字符串
else
{
char msg[BUF_SIZE];
sprintf(msg, "Message received - %s", buf);
retVal = send(sClient, msg, strlen(msg), 0);
if (SOCKET_ERROR == retVal)
{
std::cout << "send failed !" << std::endl;
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return -1;
}
}


}


//释放资源
closesocket(sServer);
closesocket(sClient);
WSACleanup();




system("pause");
return 0;


}

接着在另一台电脑上创建一个TCP Socket客户端应用程序

#include <iostream>
#include <stdio.h>
#include <WinSock2.h>
#include <string>
#include <stdlib.h>


#pragma comment (lib,"ws2_32.lib")
#define BUF_SIZE  64


int main()
{
WSADATA wsd;   //用于初始化Windows socket
SOCKET sHost;   //与服务器进行通信的socket
SOCKADDR_IN servAddr;  //服务器地址
char buf[BUF_SIZE];   //用于接收数据缓冲区
int retVal;    //调用各种Socket函数的返回值


//初始化socket动态库
if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)
{
std::cout<<"WSAStartup failed !"<<std::endl;
return -1;
}


//创建用于通信的socket
sHost=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET==sHost)
{
std::cout<<"socket failed !"<<std::endl;
WSACleanup();;
return -1;
}




//设置服务器Socket地址
servAddr.sin_family=AF_INET;
//用户需要根据实际情况修改
servAddr.sin_addr.S_un.S_addr=inet_addr("192.168.88.103");   
servAddr.sin_port=htons(9990);
int sServerAddrlen=sizeof(servAddr);




//连接到服务器
retVal=connect(sHost,(LPSOCKADDR)&servAddr,sizeof(servAddr));   
if(SOCKET_ERROR==retVal)
{
std::cout<<"connect failed !"<<std::endl;
closesocket(sHost);
WSACleanup();
return -1;
}


//在客户端与服务器之间发送和接收数据
while(true)
{
std::cout<<"Please input a string to send: ";
std::string str;
 //接收输入的数据
std::getline(std::cin,str);
 //将用户输入的数据复制到buf钟
ZeroMemory(buf,BUF_SIZE);
strcpy(buf,str.c_str());


//向服务器发送数据
retVal=send(sHost,buf,strlen(buf),0);
if(SOCKET_ERROR==retVal)
{
std::cout<<"send failed !"<<std::endl;
closesocket(sHost);
WSACleanup();
return -1;
}


//接收服务器回传的数据
retVal=recv(sHost,buf,sizeof(buf)+1,0);
std::cout<<"Recv from Server: "<<buf<<std::endl;


if(strcmp(buf,"quit")==0)
{
std::cout<<"quit!"<<std::endl;
break;
}
}


//释放资源
closesocket(sHost);
WSACleanup();


system("pause");


return 0;
}

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