[ndnSIM] How to add a new variable

[呂建德]

Dear all

I want to add a new variable in data.hpp and  create get＆set functions.
Then , in ndn-producer.cpp::oninterest , i use set functions like below.

data->setString(str);
//std::cout << data->getString() << std::endl;
I make sure that the str was set.

but , in ndn-consumer.cpp::ondata , i use get functions like below.

std::cout << data->getString() << std::endl;

there is something wrong, str is empty!

why i want to do that is the content may be encoded ,
and the consumer will receive some trash that i dont need.

can someone help me to solve this questions
I need some steps or tips.
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