Comments by Member 12018498 (Top 18 by date)

Thank you so much Alex. really its 5++ answer :)

Thanks for the suggestion. I will add more debugs and check the reason. Unfortunately,I can't add the code in try block here, as it has methods which are part of other files. and bit huge :(

Thank you Jochen for the suggestion. I went through the source code of snmp_api.
I found out when will we get SNMPERR_SUCCESS.
Below is the part of code
....................................................
if (slp->session->securityEngineIDLen == 0) {
DEBUGMSGTL(("snmp_api","unable to determine remote engine ID\n"));
snmp_sess_close(slp);
return NULL;
}
in_session->s_snmp_errno = SNMPERR_SUCCESS;
....................................................

As I am new, I dont know much about what is engineId . So trying to figure out.

Thanks again. Have a good day

NET-SNMP version: 5.4.2.1 on Unix platform.

I am really thankful for your time Jochen. Thank you so much.
went through the link suggested by you. and i see the below line
"For errors returned by snmp_sess_open(), use the corresponding function snmp_error() instead of snmp_sess_error(). " So I think that it should not be the problem.

The error code I got was SNMPERR_SUCCESS. I accessed the error code and the result I got is (0,0). which means everything is fine. go ahead. But if its returned null, there must be some problem rite?

part of code---
............................................................
struct snmp_session session;( snmp_session present in snmp_api.h.)
openSession = NetSnmp::getInstance().snmp_sess_open(&session);
if (NULL == openSession) {
int liberr=0, syserr=0;
char *errstr=NULL;
NetSnmp::getInstance().snmp_error(&session, &liberr, &syserr, &errstr);

std::string error(errstr);
::free(errstr);
cout<<"Failed to open snmp session to %s, error: %s (%d,%d)", port,errstr, liberr, syserr";
close();
}


And the output is: "Failed to open snmp session to 127.0.0.1:xxxx, error: (0,0)"

.............................................................
hence I was confused, that error code says everything is fine, but still null is returned .

Ok no problem :) . Thanks again for helping to understand.

Thank you Jochen.Does that mean there is some other problem with null value returned from snmp_open?. Please see the above comment

Thank you Andy..But the snmp session was not started .
From the below description... snmp_open will return null if some error occurs.
/*
* netsnmp_session *snmp_open(session)
* netsnmp_session *session;
*
* Sets up the session with the snmp_session information provided
* by the user. Then opens and binds the necessary UDP port.
* A handle to the created session is returned (this is different than
* the pointer passed to snmp_open()). On any error, NULL is returned
* and snmp_errno is set to the appropriate error code.
*/
netsnmp_session *snmp_open(netsnmp_session *);
............................................................
So i wrote a check if its null throw the error. Its quite clear that it was null.
Can you please suggest something

Thank you so much for suggesting. I will improvise my code. And ppolymorphe suggestion solved my problem :)

Thank you for suggestion. Yes I know that j is always below 3, because the string 'log' which reads the file has only 2 time occurrence of substing "stopping component". You are right.I found out the mistake. I changed i < Log.length() to i < coulmns.lenght. Its working now.

Thank you. I used split and then done with help of loop.

Thank you for suggestion. I tried it using newBufferedReader(Path, Charset) and printing the data in column wise. But my question is how can I print the data in certain column based on a condition.I want to give one condition " Trying to stop 'Comp'" and get the data in second column