Re: Retrieving table from external data (row identification?)

On Thu, Jul 3, 2008 at 11:13 AM, Dave Shield <[email protected]>
wrote:

> 2008/7/3 Victor Palacio <[email protected]>:
> >
> > I'm trying to use table iterator from code skeleton generated with
> > mib2c.iterate.conf.
> >
> > When I use snmptable on the agent,  get_first_data_point function is
> > executed every time one column is consulted, so I suppose I must load
> > data for consulted row in data context.
> >
> >  The problem is... How can I identify which row (index) is consulted
>
> You don't - that's the job of the iterator helper.
>
> You provide the get_{first,next}_data_point functions, which
> walk through the table in whatever order is most convenient.
>
> The iterator helper will identify the row(s) which are required for
> the current request.  It then calls your handler routine, passing
> the data structure for that row, as suppied via the 'data_context'
> parameter of the two get_{first,next} routines.
>
>
> Dave
>



--
Thanks for your answer, Dave... but I still have problems with this.

My problem is that all rows are using the last data context, so I get same
information for all rows, although then number of rows is correct.

In _get_first_data_point, I ...

1)Create Loop and Data context,
2)set number of rows in loop context and,
3)call get_next_data_point

In get_next_data_point, I assume that I can use same data_context. Perhaps
must I allocate new data context in get_next_data_point?

Regards,

CODE:

myTable_get_next_data_point(void **my_loop_context, void **my_data_context,
                         netsnmp_variable_list *put_index_data,
                         netsnmp_iterator_info *mydata)
{

    netsnmp_variable_list *vptr;

    my_loop_info *loopctx = *my_loop_context;
    my_data_info *datactx = *my_data_context;

    if (!loopctx){
      return NULL;
    }


    while (iter < loopctx->MAX_ROWS){
        iter++;

        /* OBTAIN VALUES A and B FOR ITER */
        //...

        datactx->index = iter;
        datactx->A = A;
        datactx->B = B;

        vptr = put_index_data;
        snmp_set_var_value(vptr, (u_char *) & datactx->index,
                           sizeof(datactx->index));

        *my_loop_context = loopctx;
        *my_data_context = datactx;

        return put_index_data;

    }

    /* we're out of data */
    *my_loop_context = NULL;

    return NULL;
}

********************
Victor M. Palacio
********************

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