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

Riskybiz riskybizLive at live.com
Tue Sep 17 18:27:58 CEST 2013


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,1,1,41528.600694,41528.602778,1679.75000,1679.75000,16
776960,3,0,1

415,2095, at ESU13,lower,1,1,41528.600694,41528.602778,1679.50000,1679.50000,16
776960,3,0,1

416,2095, at ESU13,marker,1,1,41528.602778,41528.602778,1679.75000,1680.50000,1
6776960,3,0,0

417,2095, at ESU13,rectangle,1,1,41528.600694,41528.603472,1679.75000,1679.5000
0,65535,0,0,1

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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