Re: [Boost-users] [Serialization] Are the serialized char* different when code runs in 32/64 bits machines ?

From: Jonathan Biggar (jon_at_[hidden])
Date: 2008-08-31 20:36:35

jotalo jotalo wrote:
> Hi,
> I use the Bost  serialization library to serialize some classes that I put in a char* variable ...
> I have a Server which publish this char* variable  and Clients get this variable and de-serialize it to obtain the original class...
> 
> Everything work fine when servers and clients are running in machines with the same architecture (64 or 32 bits)...
> 
> But when I run the server in a 64 bits machine, the char* variable is not recognized in a 32 bits client. In this code:
>     std::stringstream is;
>     is.rdbuf()->pubsetbuf(c, m_StringSize);
>     boost::archive::binary_iarchive *ia = new boost::archive::binary_iarchive(is);
> 
> The last line returns the std::exception: "invalid signature"
> 
> To be sure that I am not doing something wrong I printed the first 80 characters of this variable when it is 
> created in a 64 bits server and a 32 bits server:
> 
> In a 64 bits machine server, the print out is:
> 
> "........serialization::archive.................MonH1F............Efficiency.(cou"    (the "." are not printable ascii characters)
> 
> in Hexa format it is :
> 
> 16 00 00 00 00 00 00 00 73 65 72 69 61 6C 69 7A 61 74 69 6F 6E 3A 3A 
>  61 72 63 68 69 76 65 04 04 08 04 08 01 00 00 00 06 00 00 00 00 00 00 00 
> 4D 6F 6E 48 31 46 00 00 00 00 1E 00 00 00 00 00 00 00 45 66 66 69 63 69 
> 65 6E 63 79 20 28 63 6F 75
> 
> And ind the case of a 32 bits machine server, it is:
> 
> "....serialization::archive.............MonH1F........Efficiency.(counter2/counte"
> 
> 16 00 00 00 73 65 72 69 61 6C 69 7A 61 74 69 6F 6E 3A 3A 61 72 63 68 
> 69 76 65 04 04 04 04 08 01 00 00 00 06 00 00 00 4D 6F 6E 48 31 46 00 00 
> 00 00 1E 00 00 00 45 66 66 69 63 69 65 6E 63 79 20 28 63 6F 75 6E 74 65 
> 72 32 2F 63 6F 75 6E 74 65
> 
> 
> They are similar but not equal...

It's pretty clear here that the 64-bit machine is using a 64-bit length 
and 32-bit machine is using a 32-bit length.  Can you share the source 
of the function(s) you are using to serialize/deserialize that data?

-- 
Jon Biggar
Floorboard Software
jon_at_[hidden]
jon_at_[hidden]