本文以C与MFC的两个实例详述了取外网IP的两种实现方法,具体实现代码如下:
MFC语言实现获取外网IP:
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# 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);
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C实现获取外网IP:
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#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
}
}
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这两个示例都是通过ip138网站来查询外网IP的,感兴趣的读者也可以根据自己的喜好改动一下代码,使之更加完善。