socket 编程

服务器端：

WSAStartup

socket

bind

listen

accept

{recv。。。send}

closesocket

 WSACleanup(); 

客户端：

WSAStartup

socket

connect

send。。。recv

closesocket

WSACleanup();

代码如下：

服务器端程序：

// Server.cpp : Defines the entry point for the console application.
//
 
#include "winsock2.h"
#pragma comment(lib, "ws2_32.lib")
#include <iostream>
using namespace std;
int main(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;
}

客户端程序：

#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);
ZeroMemory(bufRecv, BUF_SIZE);
recv(sHost, bufRecv,BUF_SIZE , 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;
cout<<"
";
}
//退出
closesocket(sHost); //关闭套接字
WSACleanup(); //释放套接字资源
return 0;
}