> > You need to pass a pointer to the actual (binary) value - not a
> > printable version of it.
> > snmp_add_var(pdu, auth_OID, auth_OID_len, 'i', &value);
> Thanks but:
>
> x.c:1022: warning: passing arg 5 of `snmp_add_var' from
> incompatible pointer type
OK - so cast it to the expected type:
snmp_add_var(pdu, auth_OID, auth_OID_len, 'i', (u_char *)&value);
> value is
>
> char value[20]
>
> so it already _was_ a pointer.
Yes - but a pointer to the wrong value.
"snmp_add_var" is expecting a pointer to the *binary* value,
not to a printable representation of it.
For example, if value has the value 255,
then snmp_add_var would expect a single byte containing 0xff,
not three bytes containing the ascii characters '2', '5', '5'.
(Well, actually it'd expect the 4-octet value 0x000000ff,
but you get the idea).
The Net-SNMP suite invariably handles MIB value parameters as
u_char*, but this doesn't mean a printable string. It's best
thought of as a generic pointer - i.e. similar to void*
OK?
Dave
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