ネイティブネットワーク、外部ネットワークip(C++)の取得

//Get IP
int GetLocalIP(std::string &local_ip);
int GetInternetIP(std::string &Inernet_ip);

int GetLocalIP( std::string &local_ip )
{
	WSADATA wsaData = {0};
	if (WSAStartup(MAKEWORD(2, 1), &wsaData) != 0)
		return kErrorWSAStartup;
	char szHostName[MAX_PATH] = {0};
	int nRetCode;
	nRetCode = gethostname(szHostName, sizeof(szHostName));
	PHOSTENT hostinfo;
	if (nRetCode != 0)
		return WSAGetLastError();        
	hostinfo = gethostbyname(szHostName);
	local_ip = inet_ntoa(*(struct in_addr*)*hostinfo->h_addr_list);
	WSACleanup();
	return 1;
}

int GetInternetIP( std::string &Inernet_ip )
{
	Inernet_ip.resize(32);
	TCHAR szTempPath[_MAX_PATH] = {0}, szTempFile[MAX_PATH] = {0};
	std::string buffer;
	GetTempPath(MAX_PATH, szTempPath);
	UINT nResult = GetTempFileName(szTempPath, _T("~ex"), 0, szTempFile);
	int ret=URLDownloadToFile(NULL,_T("http://www.ip138.com/ip2city.asp"),szTempFile,BINDF_GETNEWESTVERSION,NULL);
	if (ret == S_FALSE)
		return 0;
	FILE *fp;
	if (_wfopen_s(&fp,szTempFile,_T("rb"))!=0){
		return 0;
	}
	fseek(fp,0,SEEK_END);//      
	int ilength=ftell(fp);
	fseek(fp,0,SEEK_SET);
	if(ilength>0)
	{ 
		buffer.resize(ilength);
		fread(&buffer[0],sizeof(TCHAR),ilength,fp);
		fclose(fp);
		DeleteFile(_T("ip.ini"));
		
		 char* str_ip = strstr(&buffer[0], "[");
		 if (str_ip !=NULL)
		 {
			 sscanf_s(str_ip+1, "%[^]]", &Inernet_ip[0], 32);
		 }	 
		return 1;
	}
	else
	{
		fclose(fp);
		return 0;
	}
}