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

[Michael Scofield]

I strongly recommend Google's Protocol Buffer as the 
serialization/deserialization tool. It's fast, convenient and robust. It 
directly transform an object to the bytes formation(and vice-versa), so 
can be send/recv through zeromq sockets. We are using it in our online 
game, and it works well so far.

On 2013?09?18? 00:27, Riskybiz 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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