Dynmically retrieving only objects with real values?

Hi All, 
 
I have implemented a number of objects using net-snmp-5.2.1 which seem
to work fine.  I have a table of objects, some strings, some counters.
What I want to do is when I perform an snmpwalk only return objects with
real values.  So, for example, if the first couple of objects are:
 
statsname.1 : "first app name"
statsname.2 : "second app name"
statsname.3 : "third app name"
statsname.4 : "" [no app running]
 
statsval.1 : 0
statsval.2 : 300
statsval.3 : 0
statsval.4 : 0
 
I could in theory have up to 16 entries in each category.  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;
 
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?
 
Thanks for any advice and assistance.
 
Dave

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