[ndnSIM] Compilng error during the usage of "name.toUri()"

[ZHANG, Lu]

Hi Guys,

Thanks for your prompt answer. Yes, the Ptr<ndn::pit::Entry> entry =
pit->Find(ns3::ndn::Name("/prefix")); part returns a NULL since Find uses a
exact match, there is no exact "/prefix" in my PIT.

Regards,

Lu Zhang

2016-11-21 15:25 GMT+09:00 John Baugh <jpbaugh at umich.edu>:

> Try checking if name is nullptr:
>
> ns3::ndn::Name name = entry-> GetPrefix();
>
> if(name != nullptr)
>   name.toUri();
> else
>   cout<<"ooops!"<<endl;
>
> On Nov 21, 2016 1:18 AM, "Alex Afanasyev" <aa at cs.ucla.edu> wrote:
>
>>
>> > On Nov 20, 2016, at 10:15 PM, ZHANG, Lu <lu.zhang at fuji.waseda.jp>
>> wrote:
>> >
>> > Hi all,
>> >
>> > I would like to print out the prefix name in PIT on to screen by using
>> the toUri() function in Name class. The topology is simple as below:
>> >
>> >
>> >  *      +----------+     10Mbps      +--------+     10Mbps
>> +----------+
>> >  *      | consumer | <------------> | router | <------------> |
>> producer |
>> >  *      +----------+         10ms      +--------+          10ms
>>  +----------+
>> >  *
>> >
>> >
>> > Part of my program is like below:
>> >
>> >   Ptr<ndn::Pit> pit = nodes.Get(1)->GetObject<ndn::Pit> ();
>> >   Ptr<ndn::pit::Entry> entry = pit->Find(ns3::ndn::Name("/prefix"));
>> >   ns3::ndn::Name name = entry-> GetPrefix();
>> >   name.toUri();
>> >
>> > When executing compile command ./waf --run 1 --vis I got below output:
>> >
>> > Command ['/home/11/ndnSIM/ns-3/build/scratch/1',
>> '--SimulatorImplementationType=ns3::VisualSimulatorImpl'] terminated
>> with signal SIGSEGV. Run it under a debugger to get more information (./waf
>> --run <program> --command-template="gdb --args %s <args>").
>> >
>> > Any one have clue on why this happens or how should I use the toUri()
>> function?
>>
>> You can check to run the scenario in the debugger using the suggested
>> command, but I would suspect that you're simply getting a segfault because
>> there is no "/prefix" entry in the PIT (Find returns NULL and then you're
>> dereferencing NULL).
>>
>> ---
>> Alex
>>
>>
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>>
>
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