add new node into table

 Hi
   I have a table SNMP OID,need add a node into my linkage.
   e.g. my table have 3 node,OID is:
 .1.3.6.1.4.1.17409.2.4.5.1.6.1.8.1
 .1.3.6.1.4.1.17409.2.4.5.1.6.1.8.2
 .1.3.6.1.4.1.17409.2.4.5.1.6.1.8.3
  "Set" this OID
        0: Add new line
        1:modify the line
        3:delete the line
   I set .1.3.6.1.4.1.17409.2.4.5.1.6.1.8.4 is 0   error.
   I add a function which is uesed add new node in linkage at the head of eocCNUWhiteListTable_handler function.
   
    netsnmp_request_info *request;
    netsnmp_table_request_info *table_info;
    netsnmp_variable_list *var;
    struct commitInfo *ci = NULL;
    void           *data_context = NULL;
    oid            *suffix;
    size_t          suffix_len;
    /** column and row index encoded portion */
    suffix = requests->requestvb->name + reginfo->rootoid_len + 1;
    suffix_len = requests->requestvb->name_length -
        (reginfo->rootoid_len + 1);
  printf("eocCNUWhiteListTable_handler\n");
//  int mmm=0;
//  for(mmm;mmm<suffix_len;mmm++)
//   printf("suffix[%d] = %d\n",mmm,suffix[mmm]);
  CNUWhiteListEntry *tempp = CNUWhiteListEntry_Head;
  int flag = 0;
  char te[1];
  memcpy(te,&suffix[1],1);
  while(tempp)
  {
   if(tempp->node.WriteListIndex == (int)suffix[1])
   {
    flag = 1;
    break;
   }
   tempp = tempp->next;
  }
  if(flag == 0)
  {
   tempp = SNMP_MALLOC_TYPEDEF(struct CNUWhiteListEntry);
   memset(tempp,0,sizeof(CNUWhiteListEntry));
   tempp->node.WriteListIndex = (int)suffix[1];
   tempp->node.AccStatus = 0;
   tempp->node.AutoUpgradeEN = 0;
   tempp->node.OutRfLevel = 10;
   tempp->node.PortConfigInfoIndex = 0;
   tempp->node.RowStatus = 4;
   
   printf("suffix[1] = %d\n",atoi(te));
   printf("tempp->node.WriteListIndex = %d\n",tempp->node.WriteListIndex);
   Add_CNUWhiteListEntry_List_Entry(tempp,false);   
  }
  for(tempp = CNUWhiteListEntry_Head;tempp!=NULL;tempp=tempp->next)
   printf("3333tempp->node.WriteListIndex = %d\n",tempp->node.WriteListIndex);
 

but at
              case MODE_SET_RESERVE1:
  printf("_2_data_context = %d\n",data_context);
            data_context = netsnmp_extract_iterator_context(request);
  printf("_22_data_context = %d\n",data_context); 
            break;
 the data_context is null.what can I do?
    thinks

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