I got it to work finally. For some reason, doing the snprintf as
described in my previous post did not always work:
snprintf(this_index, strlen((char *)*my_loop_context),
"%s",(const char*)*my_loop_context);
So I tried using a c++ string rather than this_index for the temporary
variable used in the comparisons:
char this_index[SPRINT_MAX_LEN];
std::string indexString((char *)*my_loop_context);
if(strcmp(indexString.c_str(),"title1")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title2");
} else if (strcmp(indexString.c_str(),"title2")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title3");
} else if (strcmp(indexString.c_str(),"title3")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title4");
}else{
return NULL;
}
I also found that using a different character array works as well:
char this_index[SPRINT_MAX_LEN];
char temp_index[SPRINT_MAX_LEN];
snprintf(temp_index, SPRINT_MAX_LEN,
"%s",(const char*)*my_loop_context);
if(strcmp(temp_index,"title1")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title2");
} else if (strcmp(temp_index,"title2")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title3");
} else if (strcmp(temp_index,"title3")==0){
snprintf(this_index,SPRINT_MAX_LEN,"title4");
}else{
return NULL;
}
-----Original Message-----
From: Toth, Gregory S
Sent: Tuesday, September 19, 2006 1:48 PM
Cc: [email protected]
Subject: RE: How to index a table with a string
That worked better for the bookTable_get_first_data_point method. Now I
am trying to use the my_loop_context in the
bookTable_get_next_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list * put_index_data,
netsnmp_iterator_info *mydata) {
char this_index[SPRINT_MAX_LEN];
//this printf shows the setting from the get_first_data_point method
printf("my_loop_context = %s\n",(char *)*my_loop_context);
snprintf(this_index, strlen((char *)*my_loop_context),
"%s",(const char*)*my_loop_context);
//this printf does not show the setting even though it should
printf("bookTable_get_next_data_point this index %s \n",this_index);
I don't seem to be able to access the data from my_loop_context in order
to increment to the next datapoint.
-----Original Message-----
From: Dave Shield [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 11:08 AM
To: Toth, Gregory S
Cc: [email protected]
Subject: Re: How to index a table with a string
On 19/09/06, Toth, Gregory S <[EMAIL PROTECTED]> wrote:
> char this_index[SPRINT_MAX_LEN] = "title1";
> snmp_set_var_value(vptr, (u_char *) &this_index ,
> sizeof(this_index) );
try
snmp_set_var_value( vptr, this_index, strlen(this_index));
The size of 'this_index' is SPRINT_MAX_LEN, but the index string doesn't
use all of this buffer. And 'this_index' is already a pointer to the
value, so you don't need to take the address again.
Dave
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