c++网络编程题

答案：客户端：

#include <iostream>
#include <Winsock2.h>
#include <sstream>
#pragma comment(lib, "Ws2_32.lib")


using namespace std;


#define MY_PORT 22222


char g_Buf[1024] = {0};


void main()
{
//网络环境
WSADATA wsaData;


//设置套接字版本号为v2.2
WSAStartup(MAKEWORD(2, 2), &wsaData);
cout << "服务器:开启网络..." << endl;


Sleep(1000);
system("cls");


SOCKET sock;    //定义套接字

sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  //初始化套接字


SOCKADDR_IN ServerAddr = {};   //填充地址信息
ServerAddr.sin_family = AF_INET;   //设置协议为TCP协议
ServerAddr.sin_port = /*htons(MY_PORT)*/MY_PORT;   //设置端口  必须和服务器端口一致，不然连接不上服务器


cout << "请输入服务器的IP地址:";   //获取访问的地址


char cServerIP[32];
cin >> cServerIP;


ServerAddr.sin_addr.s_addr = inet_addr(cServerIP);    //设置访问地址 inet_addr - 将字符串形式的IP地址转换为无符号长整形IP地址
cout << "开始连接服务器..." << endl;


Sleep(1500);
system("cls");


bool Cnt = true;
if (SOCKET_ERROR == connect(sock, (SOCKADDR*)&ServerAddr, sizeof(ServerAddr)))  //连接服务器
{
cout << "连接服务器失败..." << endl;
Cnt = false;
}
else 
{
cout << "成功连接服务器..." << endl;
Cnt = true;
}
while (1) //进入发送信息循环
{
if (Cnt == true)
{
cout << "请输入信息:";
cin >> g_Buf;


int iSend = send(sock, g_Buf, int(strlen(g_Buf) + 1), 0);


if (SOCKET_ERROR == iSend)
{
cout << "发送消息失败..." << endl;
cout << "服务器已经关闭！" << endl;
break;
}
else
{
if (0 == strcmp(g_Buf, "quit"))
{
cout << "发送退出消息..." << endl;


Sleep(1000);
system("cls");
cout << "关闭服务器..." << endl;
break;
}
else
{
Sleep(350);
recv(sock, g_Buf, 1024, 0);
cout << "服务器收到消息：" << g_Buf << endl;
}
}
}
else 
{
break;
}
}
//cout << "关闭服务器..." << endl;


Sleep(2000);
system("cls");


cout << "关闭客户端..." << endl;
//释放资源
closesocket(sock);
Sleep(2000);
}
服务器端：

#include<iostream>
#include<Winsock2.h>
#pragma comment(lib, "Ws2_32.lib")


using namespace std;


#define MY_PORT 22222   // 端口
char g_Buf[1024] = {0}; //缓冲区


void main()
{
WSADATA wsaData;   //网络环境


WSAStartup(MAKEWORD(2, 2), &wsaData);    //设置套接字版本号为v2.2
cout << "服务器：开启网络链接..." << endl;


Sleep(1500);
system("cls");


SOCKET sListen;       //定义监听套接字
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //初始化监听套接字


SOCKADDR_IN Sadd = {};
Sadd.sin_family = AF_INET;   //设置协议为TCP协议
Sadd.sin_port = /*htons(MY_PORT)*/MY_PORT;  //设置端口


int SockAddSize = sizeof(SOCKADDR_IN);  //套接字数据结构大小


bind(sListen, (SOCKADDR*)&Sadd, SockAddSize);  //绑定套接字


cout << "服务器：绑定端口..." << endl;




Sleep(1500);
system("cls");


listen(sListen,SOMAXCONN);  //设置套接字为监听模式，设置能同时监听的最大客户数量
cout << "服务器：开始监听..." << endl;


SOCKET sClient;   //客户端套接字
SOCKADDR_IN Cadd = {};  //客户端套接字数据，包含IP等总要信息


sClient = accept(sListen, (SOCKADDR*)&Cadd, &SockAddSize); //建立，等待连接
if (INVALID_SOCKET == sClient)
{
WSACleanup();
}


cout<< "服务器：客户端【" <<
(int)Cadd.sin_addr.S_un.S_un_b.s_b1 << "." <<
(int)Cadd.sin_addr.S_un.S_un_b.s_b2 << "." <<
(int)Cadd.sin_addr.S_un.S_un_b.s_b3 << "." <<
(int)Cadd.sin_addr.S_un.S_un_b.s_b4 << "】已连接..." <<endl;


int iRecvNum = 0;         //接收字节的个数
while (1)
{
iRecvNum = recv(sClient, g_Buf, 1024, 0);   //接收数据


if (iRecvNum < 1)
{
cout << "服务器：客户端失去连接..." << endl;


Sleep(1500);
system("cls");


break;
}


send(sClient, g_Buf, 1024, 0);


if (strcmp(g_Buf,"quit") == 0)
{
cout << "服务器：客户端发送退出命令..." << g_Buf << endl;
break;
}


cout << "客户端" << /*Sadd.sin_port*/MY_PORT << "消息：" << g_Buf << endl;
}
cout << "服务器：准备关闭服务器..." << endl;


closesocket(sListen);
closesocket(sClient);
WSACleanup();
Sleep(2000);
system("cls");
cout << "服务器：已经关闭服务器..." << endl;
Sleep(2000);
}
启动的时候先启动服务器，然后启动客户端
现写的程序，调试可以运行： 
tcp 
服务器端： 

#include "iostream" 
#include <winsock2.h> 

using namespace std; 

#pragma comment(lib,"ws2_32.lib")//载入win32库 
#define MAIN_PORT 5500 
#define BUFFER_LEN 1024 

void main() 
{ 
WSAData wsaData; 
WSAStartup(MAKEWORD(2,2),&wsaData);//开启服务 

SOCKET ListenSock; 
ListenSock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);//初始化监听套接字 

sockaddr_in LocalAddr={0}; 
LocalAddr.sin_family=AF_INET; 
LocalAddr.sin_port=htons(MAIN_PORT); 
LocalAddr.sin_addr.S_un.S_addr=htonl(INADDR_ANY); 

::bind(ListenSock,(sockaddr*)&LocalAddr,sizeof(sockaddr_in));//将监听套接字绑定到本地一端口上 

listen(ListenSock,5);//设置最大监听值 
cout<<"开始监听!"<<endl; 

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