Get machine properties

/** *************************************

  return string containing first MAC address on computer

  NOTE: requires adding Iphlpapi.lib to project

 */
string GetMac()
{
    char data[4096];
    ZeroMemory( data, 4096 );
     unsigned long  len = 4000;
    PIP_ADAPTER_INFO pinfo = ( PIP_ADAPTER_INFO ) data;
    char sbuf[20];
    string sret;

    DWORD ret = GetAdaptersInfo( pinfo, &len );
    if( ret != ERROR_SUCCESS )
    	return string("**ERROR**");

    for(int k = 0; k < 5; k++ ) {
    	sprintf(sbuf,"%02X-",pinfo->Address[k]);
    	sret += sbuf;
    }
    sprintf(sbuf,"%02X",pinfo->Address[5]);
    sret += sbuf;

    return( sret );
}