获取外网IP最简单的方法

std::string getOutIpaddress()
{
std::string strRet = "";
HRESULT hr = URLDownloadToFile(NULL,"http://www.3322.org/dyndns/getip","ip2city.dat",0,NULL);
if (hr != S_OK)
{
return strRet;
}

char szBuffer[1024] = {0};
memset(szBuffer,0,1024);

FILE* fp = fopen("ip2city.dat","r");
if (fp == NULL)
{
DeleteFile("ip2city.dat");
return strRet;
}

fscanf(fp,"%s",szBuffer);
fclose(fp);

DeleteFile("ip2city.dat");

strRet = szBuffer;

return strRet;
}