C++完成域名解析

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network类：
自定义network.h头文件

#ifndef  _WINSOCK_DEPRECATED_NO_WARNINGS#define  _WINSOCK_DEPRECATED_NO_WARNINGS#endif#ifndef _CRT_SECURE_NO_WARNINGS#define _CRT_SECURE_NO_WARNINGS#endif#ifndef _NetWorkAPI_#define _NetWorkAPI_#include<WinSock2.h>#pragma comment(lib,"ws2_32.lib")class network{public:    network();    ~network();protected:    int err;    char *IpAddr[8];  //存域名的ip地址（可能存在多个ip地址）    bool gethostip();    int True;//标记有效地IP地址};#endif

类代码实现：

#include"network.h"#include <iostream>network::~network(){    for (int i = 0; i < 8; i++)    {        if (*(IpAddr + i))            delete[] *(IpAddr + i);        else            break;    }}network::network(){    memset(IpAddr, NULL, 8);    err = gethostip();}bool network::gethostip(){    //加载套接字库      WORD wVersionRequested;    WSADATA wsaData;    wVersionRequested = MAKEWORD(1, 1);    //初始化Socket动态连接库,请求1.1版本的winsocket库      err = WSAStartup(wVersionRequested, &wsaData);    if (LOBYTE(wsaData.wVersion) != 1 ||   //判断请求的winsocket是不是1.1的版本          HIBYTE(wsaData.wVersion) != 1)    {        WSACleanup();          //清盘          return false;                  //终止对winsocket使用      }    //WSADATA ws;      //WSAStartup(MAKEWORD(2,2),&ws);//      char http[] = "www.myvip6.com";           //访问服务器域名    SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);//建立socket      if (sock == INVALID_SOCKET)    {        std::cout << "建立访问socket套接字失败!" << std::endl;        return false;    }    hostent* host = gethostbyname(http);//取得主机的IP地址      if (host == NULL)    {        //std::cout << "主机处于没有联网状态;" << std::endl;        return false;    }    in_addr addr;    for (int i = 0;; i++)    {        char *p = host->h_addr_list[i];        if (p == NULL)            break;        memcpy(&addr.S_un.S_addr, p, host->h_length);        *(IpAddr + i) = new char[strlen(inet_ntoa(addr)) + 1];        strcpy(*(IpAddr + i), inet_ntoa(addr));        //std::cout << *(IpAddr + i);    }    return true;}

通过socket完成域名的解析

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