Re: OID printing question

   Ah ... your explanation was highly illuminating.  I didn't realize 
that I was using a more specific function and that the *print_value() 
function would have sufficed. I thought it was up to me (my code) to 
intuit the type of data and to call the appropriate printing function. 
Thanks!!

  Shane


Dave Shield wrote:

> On 20/07/06, Shane D <[email protected]> wrote:
>
>>   But I was trying to print an OID (system.sysObjectID).  The expected
>> string would print, but then all kinds of numeric jibberish was appended
>> to it (using snprint_objid).
>>           .... did I miss some place where something talks about
>> this mysterious division by sizeof(oid)?
>
>
> It's probably not mentioned explicitly, no.
>
> The prototype for the 'print_objid' family is given as:
>       void {sn,f,}print_objid( ...., oid *objid, int objidlen);
> where 'objidlen' is the length of the objid array - i.e the number of
> sub-identifiers in the OID.
> That's the standard way of representing the name side of (name=value) 
> varbinds.
>
> Howevere, values are represented as a union of the various possible
> syntaxes, and are typically displayed using the 'print_value' family
> of routines.  This takes the absolute size of the value (since this
> could be a printable/binary string, or some form of integer, or an
> OID),
> checks the type and interprets the value accordingly.
>
> If you're handling this manually, you need to do much the same - check
> the type of the value returned, and interpret the results
> appropriately.  That's where this sizeof(oid) comes into play -
> converting from a general-purpose value (where you work with the size
> of the data) to an OID array (where you work with the number of
> elements).
>
>
> It's undoubtably true that the documentation could be significantly
> better - both here and elsewhere.  Unfortunately, those of us who've
> been working with this code for years (and so are probably the best
> placed to provide such descriptions), are too familiar with how things
> work to recognise where the most glaring deficiencies lie.
>
> Dave



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