[zeromq-dev] How to send/receive a custom C++ object via zeromq sockets?

Pieter Hintjens ph at imatix.com
Tue Sep 17 19:05:34 CEST 2013


There are lots of ways to serialize data. In your case you could
simply send the comma-delimited data as a single string and parse that
at the receiver side.

On Tue, Sep 17, 2013 at 6:27 PM, Riskybiz <riskybizLive at live.com> wrote:
> So, I’ve got a working implementation of a zeromq REQ-REP socket pattern and
> am using it to pass data in the form of character strings between a server
> and several clients, like so:
>
> Sample comma separated data strings sent as a multipart message (of several
> thousand parts), each line is a complete instruction for the client to draw
> something on screen:
>
>
>
> 414,2095, at ESU13,upper,1,1,41528.600694,41528.602778,1679.75000,1679.75000,16776960,3,0,1
>
> 415,2095, at ESU13,lower,1,1,41528.600694,41528.602778,1679.50000,1679.50000,16776960,3,0,1
>
> 416,2095, at ESU13,marker,1,1,41528.602778,41528.602778,1679.75000,1680.50000,16776960,3,0,0
>
> 417,2095, at ESU13,rectangle,1,1,41528.600694,41528.603472,1679.75000,1679.50000,65535,0,0,1
>
> 418,2095, at ESU13,label,1,1,41528.600694,1679.50000,ID:2095 0.0149% 5Bars 100D
> 3.00IR,Arial,5.00000,0,0
>
>
>
> My issue is that each of the data strings has to be composed at the server
> and then decoded at the client end to extract the data; this works but is
> not very elegant, I’m sure there is a better and more efficient way………
>
>
>
> I have the notion that I’d like to try encapsulating each line of the data
> to be sent in a custom class object object instance; then serialize each
> object, pass it through the REQ-REP sockets and deserialise to reconstruct
> the object at the client end.  The simple class would be in the format like
> so; only comprising data members.
>
>
>
> class Instruction
>
> {
>
> public:
>
> //Constructor
>
> Instruction(const unsigned int &intData, const double &dblData, const
> std::string &strData): IntData(intData), DblData(dblData), StrData(strData)
>
> {
>
> }
>
>
>
> //Data Members
>
> const unsigned int IntData;
>
> const double DblData;
>
> const std::string StrData;
>
> };//class
>
>
>
> Trouble is I don’t know how to implement this practically.  Is anyone able
> to provide a simple example of how to accomplish serialising and
> deserialising a custom object and sending it though a REQ-REP socket pair?
> Or does anyone know of a good online tutorial on this subject? I’m working
> with Visual Studio 2012 Express in C++.
>
>
>
> With very many thanks,
>
>
>
> Riskybiz.
>
>
>
>
>
>
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>



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