[zeromq-dev] Vector transmission via REQ-REP. Am I missing something obvious?

[James Chapman]

Serialisation! Of course.
I was missing something obvious.

Thanks






On 9 April 2015 at 12:22, Dorvin <dorvin at tlen.pl> wrote:

> sizeof() for containers doesn't work the way you'd like to. You should
> use size() function of std::vector.
>
> As you're using C++ i would recommend to change structs to objects (even
> without methods if you don't need them), overload operators << and >>
> for this class and do some simple serialization/deserialization or use
> serialization library like Google Protobuf.
>
>
> Cheers,
> Jarek
>
>
>
> W dniu 2015-04-09 o 12:53, James Chapman pisze:
> > -- In case this appears twice, sent again this time from the list
> > subscribed account --
> >
> > Hello list
> >
> > I could use some help... Using the REQ-REP model in C++ I'm trying to
> > send a vector, but failing miserably and I can't work out why. Maybe
> > this will never work? Maybe the idea of sending a vector is a bad and
> > broken idea to start with and I should instead be trying to send a fixed
> > size? But then if sending a vector is impossible, how do I send a
> > variable amount of data? Should I just be using large enough buffers to
> > allow for my largest expected data transfer? -This seems wasteful.
> >
> > Guidance on this matter would be greatly appreciated.
> >
> > I should add that failure is happening on the receiving end when trying
> > to read the vector field.
> >
> > example (In this case TestMessage is a struct of what I want to send. If
> > I include a vector<int> field in TestMessage it fails.)
> >
> > zmq::message_t  * pZmqMsgOut =new  zmq::message_t(sizeof(TestMessage));
> > memcpy((void  *)pZmqMsgOut->data(), pTestMsg,sizeof(*pTestMsg));
> >
> >
> > Thanks in advance.
> > James
> >
> >
> >
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> >
>
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