Re: [certi-dev] ForwardSim HLA Blockset: data coding

[Jean-Philippe Lebel]

Hi Jon,

I'm the lead developer of the HLA Toolbox.

You can manually decode the received value by using the following code

        union{
            double ds;
            char cs[8];
        }before;

        before.cs= Your received 8  bytes array here;

You can then access the double by using before.ds

Depending on the endianess, you might need to swap bytes.

            for(int i=0;i<8;i++)  newarray[i] = before.cs[8-1-i] ;


Good luck

JPL

On 18/07/2012 9:08 AM, REGUEIRO Jon wrote:
> Hi,
>
> I don't know if someone has worked on this before but I will try...
>
> I have just begun to work with HLA Blockset for Simulink, a commercial 
> product developed by ForwardSim. There are two federates. The federate 
> in Simulink is updating 5 attributes that the federate in Linux is 
> subscribed to.
>
> This Simulink model uses a block called "encode" to convert double 
> variables to values usable by RTI. The following data types can be 
> chosen:
>
> -------------
> HLAoctet
> HLAbyte
> HLAoctetPairBE
> HLAinteger16BE
> HLAinteger32BE
> HLAinteger64BE
> HLAfloat32BE
> HLAfloat64BE
> HLAoctetPairLE
> HLAinteger16LE
> HLAinteger32LE
> HLAinteger64LE
> HLAfloat32LE
> HLAfloat64LE
> --------------
>
> The federate written in C++ uses the class called "MessageBuffer" to 
> manage data. I am using the function called "read_double()" [without 
> s] to read the buffer, but it gives an error and stops the execution.
>
> Both machines are little endian, so I have been coding data to 
> "HLAfloat64LE". I have tried with different combinations but I still 
> have not found my mistake.
>
>
> Than you in advance!
> Jon Regueiro


--
Jean-Philippe Lebel, ing., MBA
ForwardSim inc.
Tel.: 418-650-3493 ext 6001
Fax.: 418-650-5661