【原创】C++实现获取本机机器名及外网IP代码

上代码：

  1 #include "stdafx.h"

  2 #include <WINSOCK2.H>

  3 #include <urlmon.h>

  4  

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

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

  7  

  8 #define MAX_SIZE 1024

  9  

 10  

 11 int GetLocalIP();

 12 int GetInternetIP();

 13  

 14 int main(int argc, char* argv[])

 15 {

 16     GetLocalIP();

 17     GetInternetIP();

 18     return 0;

 19 }

 20  

 21  

 22 int GetLocalIP()

 23 {

 24     WSADATA wsaData;

 25     int err = WSAStartup(MAKEWORD(2, 0), &wsaData);

 26     if (err != 0)

 27     {

 28         return err;

 29     }

 30  

 31     char szHostName[MAX_PATH] = {0};

 32     int nRetCode;

 33     nRetCode = gethostname(szHostName, sizeof(szHostName));

 34  

 35     char* lpLocalIP;

 36     PHOSTENT hostinfo;

 37  

 38     if (nRetCode != 0)

 39     {

 40         return WSAGetLastError();        

 41     }

 42  

 43     hostinfo = gethostbyname(szHostName);

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

 45  

 46     if (szHostName != NULL)

 47     {

 48         printf("主机名: %s\n", szHostName);

 49         printf("本地IP: %s\n", lpLocalIP);

 50     }

 51  

 52     WSACleanup();

 53     return 0;

 54 }

 55  

 56 int GetInternetIP()

 57 {

 58     char buf[MAX_PATH] = {0};    //把网页中读出的数据放在此处

 59     char chTempIp[128] = {0};

 60     char chIP[64] = {0};        //最终存放IP在此

 61  

 62     //将网页数据写入c:\i.ini文件中

 63     URLDownloadToFile(0, "http://iframe.ip138.com/ic.asp", "c:\\i.ini", 0, NULL);

 64  

 65     FILE *fp = fopen("c:\\i.ini", "r");

 66     if (fp != NULL)

 67     {

 68         //

 69         fseek(fp, 0, SEEK_SET);

 70         fread(buf, 1, MAX_PATH, fp);

 71         fclose(fp);

 72  

 73         //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

 74         char* iIndex = strstr(buf, "[");

 75         if (iIndex)

 76         {

 77             sprintf(chTempIp, "%s", iIndex);

 78             int nBuflen = strlen(chTempIp);

 79  

 80             for (int i = 0; i < nBuflen; i++)

 81             {

 82                 chIP[i] = chTempIp[i+1];

 83  

 84                 //如果发现有 ] 则截断

 85                 if (chTempIp[i] == ']')

 86                 {

 87                     chIP[i-1] = '\0';

 88                     //printf("外网IP: %s\n", chIP);

 89                 }

 90             }

 91         }

 92  

 93     }

 94  

 95     printf("外网IP: %s\n", chIP);

 96     remove("c:\\i.ini");

 97  

 98     return 0;

 99  

100 }