[ENet-discuss] A query about channels

[Ruud van Gaal]

I use a packet class where I can just add bytes & shorts & ints (and
strings) to a packet. So you just:

enum Cmd
{
  CMD_CAR_UPDATE,
  CMD_CHAT,
...
};

pkt=new Packet();
pkt->AddChar(CMD_CAR_UPDATE);
pkt->AddFloat(carX);
...

and later at the receiving end:

cmd=pkt->GetChar();
if(cmd==...){ ... }

Although a struct where all things start with 'char cmd' can also do nicely.
Learn more about pointers and dereferencing them in C/C++.

Cheers,
Ruud


> -----Oorspronkelijk bericht-----
> Van: enet-discuss-bounces at cubik.org 
> [mailto:enet-discuss-bounces at cubik.org] Namens Alex Milstead
> Verzonden: Sunday, January 17, 2010 20:54
> Aan: Discussion of the ENet library
> Onderwerp: Re: [ENet-discuss] A query about channels
> 
> In that case, is there a solid way to extract that 
> identifier? Or will I need to do some I'm aware of sprintf 
> calls, is it common practice to simply "sprintf" the first 
> integer of the received binary data into a buffer and 
> (effectively) switch-case on that buffer, then memcpy the 
> remaining data that follows? Or is there a better way of doing this?
> 
> Cheers,
> Alex
> 
> On Jan 17, 2010, at 2:39 PM, Thorbjørn Lindeijer 
> <bjorn at lindeijer.nl>  
> wrote:
> 
> > On Sun, Jan 17, 2010 at 19:50, Alex Milstead  
> > <alex.milstead at gatech.edu> wrote:
> >> Also, Jay you mentioned earlier that it was easy to do 
> simple data- 
> >> type
> >> checking on the receiving end. I'm a bit of a fledgling network  
> >> programmer
> >> -- I'm still definitely becoming more acquainted the vast amount of
> >> unfamiliar programming techniques in this particular 
> arena. The only
> >> surefire type-checking system I know about in programming is in  
> >> java (=/),
> >> with it's "instanceof" operator. As far as I know this type of  
> >> mechanism, or
> >> anything similar, doesn't really exist in C/C++. So my next  
> >> question is, if
> >> we're sending binary data along and receiving it as binary data,  
> >> what's the
> >> most efficient way of type-checking the probable struct 
> being piped  
> >> through?
> >
> > You give it a number which designates its type. You'd 
> usually prepend
> > such a number to each of your messages, so that you know how to
> > interpret them on the other end.
> >
> > Regards,
> > Bjørn
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