C和MFC巧妙获取外网IP的两种实现方法

# include <windows.h># include <urlmon.h># pragma comment(lib,"URLMON.lib")void main(){  URLDownloadToFile(NULL,"http://www.ip138.com/ip2city.asp","ip.txt",0,NULL);  system("notepad ip.txt");}#include<urlmon.h>#pragma comment (lib,"Urlmon.lib")char buf[MAX_PATH] = {0};char chTempIp[128];char chIP[64];URLDownloadToFile(0,"http://www.ip138.com/ip2city.asp","c://1.ini",0,NULL);FILE *fp=fopen( "c://1.ini", "r" );if ( fp != NULL ) {fseek(fp, 0, SEEK_SET);fread(buf,1,256,fp);fclose(fp);char* iIndex = strstr(buf,"[");if (iIndex)  {   sprintf( chTempIp,"%s",iIndex);   int nBuflen = strlen(chTempIp);for(int i =0; i<nBuflen; i++)   { chIP[i] = chTempIp[i+1]; if(chTempIp[i] == ']')  {chIP[i-1] = '/0';   DeleteFile("c://1.ini");   continue; }    }}}MessageBox(chIP);

#include <afxinet.h>void CLanChatDlg::GetNetIP(){SetDlgItemText(IDC_NET_IP,"正在获取外网IP");CString strsource;CString Address;CInternetSession mySession(NULL,0);CHttpFile* myHttpFile=NULL;Address="http://www.ip138.com/ip2city.asp";//ip138网页myHttpFile=(CHttpFile*)mySession.OpenURL(Address);//读取网络地址while(myHttpFile->ReadString(strsource)){ //循环读取下载来的网页文本 // AddToLog(strsource); int begin=0; begin=strsource.Find("[",0);  if(begin!=-1)//如果找到"["， 则找"]" 中括号内的文本则是 你的外网ip { int end=strsource.Find("]"); m_internetip=strsource.Mid(begin+1,end-begin-1);//提取外网ip SetDlgItemText(IDC_NET_IP,m_internetip);//在左下角显示外网ip }}