[ndnSIM] How to add additional std::vector<std::string> type field in Interest packet

[Mudasir Qazi]

Hi,
Any update on this? I have tried following way in wireDecode but still
getting error.
        val = m_wire.find(tlv::MyVector);
    uint8_t* temp = reinterpret_cast<uint8_t*>(val->value(), val->size());
    stringstream ss;
    ss << temp;
    boost::archive::binary_iarchive ia(ss);
    std::vector<std::string> myTempVector;
    ia >> myTempVector;
    m_MyVector = myTempVector;


Following error occurs:
error: ‘class std::vector<std::__cxx11::basic_string<char> >’ has no member
named ‘serialize’
         t.serialize(ar, file_version);

Can anyone suggest a better/complete solution of my problem?


On Tue, 22 May 2018 at 23:34, Mudasir Qazi <mudasirqazi00 at gmail.com> wrote:

> Hi,
> I have tried the solution you suggested. The serialization/deserialization
> of a vector to .txt file is not much difficult. I have practiced it in
> separate file and it works fine. I have created a vector and serialized it
> into a .txt file, than I read same .txt file and saved the data in a
> separate vector. I have done this using ifstream and ofstream as most of
> the solutions on Internet have suggested. All this works.
>
> But in the scenario of ndnSIM, I am unable to related it. Because in
> practice work we have ifstream to be deserialized into a vector, while in
> wireDecode method of interest.cpp file we have
> Block::element_const_iterator type of val initialized by statement val =
> m_wire.find(tlv::MyVector). Now I don't understand how can I treat
> Block::element_const_iterator as ifstream to get it deserialized.
>
> Please help me and suggest further what should I do to achieve this.
>
> On Tue, 22 May 2018 at 18:10, Mudasir Qazi <mudasirqazi00 at gmail.com>
> wrote:
>
>> Great catch! Thank you so much sir. I'm doing it right now. Thanks again.
>>
>> On Tue, 22 May 2018 at 18:08, Junxiao Shi <shijunxiao at email.arizona.edu>
>> wrote:
>>
>>> Hi Mudasir
>>>
>>>
>>>> //for MyVector
>>>> std::vector<std::string> myTempVector = this->getMyVector();
>>>>     totalLength += encoder.prependByteArray(
>>>>             reinterpret_cast<uint8_t*>(&myTempVector),
>>>> sizeof(myTempVector));
>>>>     totalLength += encoder.prependVarNumber(sizeof(myTempVector));
>>>>     totalLength += encoder.prependVarNumber(tlv::MyVector);
>>>>
>>>
>>>
>>>> //for MyVector
>>>> val = m_wire.find(tlv::MyVector);
>>>> if (val == m_wire.elements_end()) {
>>>>     BOOST_THROW_EXCEPTION(Error("MyVector element is missing"));
>>>> }
>>>> std::vector<std::string> myTemVector;
>>>> if (val->value_size() != sizeof(myTemVector)) {
>>>>     BOOST_THROW_EXCEPTION(Error("myTemVector element is malformed"));
>>>> }
>>>> std::memcpy(&myTemVector, val->value(), sizeof(myTemVector));
>>>> m_MyVector = myTemVector;
>>>>
>>>> *Problem:* I'm following these 1-to-5 steps in order to add an Integer
>>>> and a std::vector<std::string> fields in Interest packet but it gives an
>>>> error on *wireDecode* while decoding MyVector field and simulation
>>>> stops and terminates. But it does not give error on MyInteger field. Am I
>>>> doing it right? Am I missing something? Please help me solving this I'm
>>>> stuck on this point from many days.
>>>>
>>>
>>> You did not serialize <https://en.wikipedia.org/wiki/Serialization> the
>>> std::vector<std::string>, but merely copied the header structure of
>>> std::vector<std::string>. Thus, you triggered undefined behavior in STL
>>> library.
>>>
>>> Learn to write the following two programs in C++:
>>>
>>>    1. Given a std::vector<std::string>, write it to a file.
>>>    2. Read the above file into a std::vector<std::string>, and print it
>>>    on screen.
>>>
>>> After you wrote these programs, you can use the same technique to write
>>> to and read from TLV structures.
>>>
>>> Yours, Junxiao
>>>
>>
>>
>> --
>> Regards,
>> Mudasir Qazi
>>
>
>
> --
> Regards,
> Mudasir Qazi
>


-- 
Regards,
Mudasir Qazi
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