获取外网IP的方法

void GetIP()
{
CInternetSession session;
const CString strUrl = TEXT("http://iframe.ip138.com/ip2city.asp");
CInternetFile * httpfile = (CInternetFile *)session.OpenURL(strUrl);
CString strContent = TEXT("");
CString strData = TEXT("");
while(httpfile->ReadString(strContent))
{
strData += strContent;
}
int nStart = strData.Find("[");
int nEnd   = strData.Find("]");
int nCount = nEnd - nStart;
strData    = strData.Mid(nStart + 1,nCount - 1);

MessageBox("您的ip是: "+strData);

httpfile->Close();
session.Close();
}