RE: Dynmically retrieving only objects with real values?

Thanks Dave, but  

"
Use exactly the same test as above:

     case STATSVALUE:
         if ( strlen(tempPTR->Name) == 0 ) return NULL;      <====
         long_ret = tempPTR->Value;
         return (unsigned char *) &long_ret; "

tempPTR->Name is not a string, it's an integer.

Is it safe to cast it?  Or is there another way to do the test?  How can
I determine if the pointer is referencing a real value or not?

Dave 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Dave Shield
Sent: Wednesday, January 10, 2007 4:11 AM
To: Wilson, Dave
Cc: [email protected]
Subject: Re: Dynmically retrieving only objects with real values?

On 09/01/07, Wilson, Dave <[email protected]> wrote:
>                                          However, I do not want to 
> return entries if they have no value, so in this example, I won't 
> return statsname.4, but the walk will go onto the next category.  I do

> this by using code like this in the var_CommonStatsTable function:
>
>     case STATSNAME:
>         strcpy (string, tempPTR->Name);
>         *var_len = strlen(string);
>         if ( strlen(string) == 0 ) return NULL;
>         return (unsigned char *) string;

I would suggest not updating '*var_len' until after you've
checked whether this entry is valid.   It probably doesn't
make a difference, but

     case STATSNAME:
         strcpy (string, tempPTR->Name);
         if ( strlen(string) == 0 ) return NULL;
         *var_len = strlen(string);
         return (unsigned char *) string;

would be slightly safer


> This works fine for strings, but not counters because I sometimes want

> to return objects with values of 0, eg. statsval.1, but I don't want 
> to return statsval.4.
>
> How do I do this so that both snmpwalk and a specific snmpget (eg. on
> statsval.3) will work?

Use exactly the same test as above:

     case STATSVALUE:
         if ( strlen(tempPTR->Name) == 0 ) return NULL;      <====
         long_ret = tempPTR->Value;
         return (unsigned char *) &long_ret;

Dave

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