problem about sending V2 trap

Dear:

I have a problem about sending V2 trap.

When I use "snmp.c, snmp.so" to send trap,I can recerive it sucessfully.

But when I use:

$ gcc main.c -L -lsnmp …… -I ./include -o main

In the main.c,Iuse:

write_exampletrap2(COMMIT,NULL,0,0,NULL,NULL,0)

to send trap.

In my snmp.c, I use:

var_trap.next_variable = &var_str; /* next variable */
var_trap.name = objid_snmptrap; /* snmpTrapOID.0 */
var_trap.name_length = sizeof(objid_snmptrap) / sizeof(oid); /* number of sub-ids */
var_trap.type = ASN_OBJECT_ID;
var_trap.val.objid = demo_trap; /* demo-trap objid */
var_trap.val_len = sizeof(demo_trap); /* length in bytes (not number of subids!) */

/*
* additional objects
*/
var_str.next_variable = &var_pon; /* next variable*/
var_str.type = ASN_INTEGER; /* type of variable */
var_str.val.integer = &var_default.traptype; /* value */
var_str.val_len = sizeof(var_default.traptype);

var_pon.next_variable = &var_onu; /* next variable */
var_pon.name = var_default.pon_oid;
var_pon.name_length = sizeof(var_default.pon_oid)/ sizeof(oid); /* number of sub-ids */
var_pon.type = ASN_OCTET_STR; /* type of variable */
var_pon.val.string = "PONoid"; /* value */
var_pon.val_len = sizeof("PONoid");

if(var_default.is485==1)
{
var_onu.next_variable = &var_onu485;
}
else
{
var_onu.next_variable = NULL;
}

var_onu.name = var_default.onu_oid;
var_onu.name_length = sizeof(var_default.onu_oid)/ sizeof(oid); /* number of sub-ids */
var_onu.type = ASN_OCTET_STR; /* type of variable */
var_onu.val.string = "ONUoid"; /* value */
var_onu.val_len = sizeof("ONUoid");

var_onu485.next_variable = NULL; /* No more variables after this one */
var_onu485.name = var_default.onu485_oid;
var_onu485.name_length = sizeof(var_default.onu485_oid) / sizeof(oid);/* number of sub-ids */
var_onu485.type = ASN_OCTET_STR; /* type of variable */
var_onu485.val.string = "ONU485oid"; /* value */
var_onu485.val_len = sizeof("ONU485oid");

DEBUGMSGTL(("example", "write_exampletrap2 sending the v2 trap\n"));
send_v2trap(&var_trap);
DEBUGMSGTL(("example", "write_exampletrap2 v2 trap sent\n"));

There are some errors. It returns:

$ No log handling enabled - turning on stderr logging

send_trap: no v2 trapOID varbind provided

What can I do to solve the problem?

Looking forward for your help!Thanks!

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