客户服务器编程示例

先建立两个工程Server和Client，添加StdAfx.h和WINSOCK2.h两个头文件，然后编写下面的两段代码：

Server.cpp:

#include "StdAfx.h"

#include "WINSOCK2.h"

#include <iostream>

#define _TCHAR char

#pragma   comment(lib, "ws2_32.lib ") 

using namespace std;

int main(int argc, _TCHAR* argv[])

{

         WSADATA                       wsaData;

         SOCKET                          ListeningSocket;

         SOCKADDR_IN                ServerAddr;

         SOCKET                          NewConnection;

         SOCKADDR_IN                ClientAddr;

         int                                    Port = 5150;

         WSAStartup(MAKEWORD(2,2), &wsaData);// 初始化Windows Socket 2.2

        ListeningSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);//创建一个新的Socket来响应 客户端的连接请求；AF_INET字段是表示网络地址的类型，AF_INET表示是internet域中进行通信；SOCK_STREAM表示socket的类型，SOCK_STREAM表示是流套接字IPPROTO_TCP表明协议类型,IPPROTO_TCP或者0表示TCP/IP协议

   

        ServerAddr.sin_family = AF_INET;                                                         // 填写服务器地址信          

        ServerAddr.sin_port = htons(Port);                                                        // 端口为5150

        ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);//INADDR_ANY表示机器上的所用网络地址 ; 比如你的机器上有两张网卡，那么到达这两张网卡的数据，你的socket都可以得到通知；htonl将IP地址转换为网络格式

        bind(ListeningSocket, (SOCKADDR *)&ServerAddr, sizeof(ServerAddr));        //绑定监听端口;当调用socket函数创建套接字后，该套接字并没有与本机地址和端口等信息相连，bind函数将完成这些工作

       

        listen(ListeningSocket, 2);                                                                                 // 开始监听，指定最大同时连接数为2

        int len = sizeof(ClientAddr);

        NewConnection = accept(ListeningSocket, (SOCKADDR *) &ClientAddr, &len);// 接受新的连接

        cout << "************************************************" << endl;

        cout << "****new client has been connected******" << endl;

        cout << "*************************************************" << endl;

         /* 当连接建立之后，我们就可以在这里和client进行通信，传输数据了*/

        closesocket(NewConnection);                                                                               //关闭连接

        closesocket(ListeningSocket);                                                                              //并关闭监听Socket

        WSACleanup();                                                                                                     // 释放Windows Socket DLL的相关资源

getchar();

        return 0;

}

Client.cpp:

#include "StdAfx.h"

#include "WINSOCK2.h"

#include <iostream>

#define _TCHAR char

#pragma comment(lib,"ws2_32.lib")

using namespace std;

int main(int argc, _TCHAR* argv[])

{

        WSADATA                   wsaData;

        SOCKET                     s;

        SOCKADDR_IN          ServerAddr;

        int                                Port = 5150;   

        WSAStartup(MAKEWORD(2,2), &wsaData);                                               //初始化Windows Socket 2.2      

        s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);                           // 创建一个新的Socket来连接服务器  

       ServerAddr.sin_family = AF_INET;

       ServerAddr.sin_port = htons(Port);    

       ServerAddr.sin_addr.s_addr = inet_addr("127.0.0.1");                                //在程序中我与本机进行通信

       int result = connect(s, (SOCKADDR *) &ServerAddr, sizeof(ServerAddr));   // 向服务器发出连接请求

       if(result == 0){                                                                                                //result==0表示连接成功

               cout << "Client has connected to server!";

      }

       closesocket(s);

       WSACleanup();

   getchar();

       return 0;

}

附：StdAfx.h的代码

// stdafx.h : include file for standard system include files,

//  or project specific include files that are used frequently, but

//      are changed infrequently

//

#if !defined(AFX_STDAFX_H__394205FE_C7DC_42D4_B4B5_93EC44EB784C__INCLUDED_)

#define AFX_STDAFX_H__394205FE_C7DC_42D4_B4B5_93EC44EB784C__INCLUDED_

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers

#include <stdio.h>

// TODO: reference additional headers your program requires here

//{{AFX_INSERT_LOCATION}}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_STDAFX_H__394205FE_C7DC_42D4_B4B5_93EC44EB784C__INCLUDED_)