【原创】C++实现获取本机机器名及外网IP代码

上代码：

 #include "stdafx.h"
 #include <WINSOCK2.H>
 #include <urlmon.h>

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

 #define MAX_SIZE 1024

 int GetLocalIP();
 int GetInternetIP();

 int main(int argc, char* argv[])
 {
     GetLocalIP();
     GetInternetIP();
     return ;
 }

 int GetLocalIP()
 {
     WSADATA wsaData;
     int err = WSAStartup(MAKEWORD(, ), &wsaData);
     if (err != )
     {
         return err;
     }

     char szHostName[MAX_PATH] = {};
     int nRetCode;
     nRetCode = gethostname(szHostName, sizeof(szHostName));

     char* lpLocalIP;
     PHOSTENT hostinfo;

     if (nRetCode != )
     {
         return WSAGetLastError();
     }

     hostinfo = gethostbyname(szHostName);
     lpLocalIP = inet_ntoa(*(struct in_addr*)*hostinfo->h_addr_list);

     if (szHostName != NULL)
     {
         printf("主机名: %s\n", szHostName);
         printf("本地IP: %s\n", lpLocalIP);
     }

     WSACleanup();
     return ;
 }

 int GetInternetIP()
 {
     char buf[MAX_PATH] = {};    //把网页中读出的数据放在此处
     char chTempIp[] = {};
     char chIP[] = {};        //最终存放IP在此

     //将网页数据写入c:\i.ini文件中
     URLDownloadToFile(, "http://iframe.ip138.com/ic.asp", "c:\\i.ini", , NULL);

     FILE *fp = fopen("c:\\i.ini", "r");
     if (fp != NULL)
     {
         //
         fseek(fp, , SEEK_SET);
         fread(buf, , MAX_PATH, fp);
         fclose(fp);

         //在buf中查找 [ 的位置, iIndex是buf中从[开始剩下的字符串，包括[这个字符串
         char* iIndex = strstr(buf, "[");
         if (iIndex)
         {
             sprintf(chTempIp, "%s", iIndex);
             int nBuflen = strlen(chTempIp);

             for (int i = ; i < nBuflen; i++)
             {
                 chIP[i] = chTempIp[i+];

                 //如果发现有 ] 则截断
                 if (chTempIp[i] == ']')
                 {
                     chIP[i-] = '\0';
                     //printf("外网IP: %s\n", chIP);
                 }
             }
         }

     }

     printf("外网IP: %s\n", chIP);
     remove("c:\\i.ini");

     return ;

 }