sourceforge tutorial sample code problem

Hi, there!

I compiled some sample code provided by sorceforge(http://net-snmp.sourceforge.net/tutorial/tutorial-5/toolkit/asyncapp/index.html), but it will run into error when call the 'initialize()' function:

void initialize (void)
{
  struct oid *op = oids;
  
  /* Win32: init winsock */
  SOCK_STARTUP;

  /* initialize library */
  init_snmp("asynchapp");

  /* parse the oids */
  while (op->Name) {
    op->OidLen = sizeof(op->Oid)/sizeof(op->Oid[0]);
    if (!read_objid(op->Name, op->Oid, &op->OidLen)) {  //########IT WILL RUN INTO ERROR HERE!!#########
      snmp_perror("read_objid");
      exit(1);
    }
    op++;
  }
}

The program will report 'read_objid: Unknown Object Identifier (Sub-id not found: (top) -> system)'. 

And I paste oid definition here:

struct oid {
  const char *Name;
  oid Oid[MAX_OID_LEN];
  int OidLen;
} oids[] = {
  { "system.sysDescr.0" },
  { "interfaces.ifNumber.1" },
  { "interfaces.ifNumber.0" },
  { NULL }
};

It seems that read_objid function don't understand what is 'system.sysDesc.0', could anybody tell me why this error happend? Thanks!
--------------
xiao ren
2008-06-23

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