Using boost serialization to send a vector.

Networking and Multiplayer Programming

Started by Fezziwig November 02, 2012 11:56 PM

1 comment, last by hplus0603 11 years, 6 months ago

140

Author

November 02, 2012 11:56 PM

I've run into a real problem with regards to sending serialized vectors over a socket. A simplified example of what I'm doing:

Server:



#include <boost/serialization/vector.hpp>





struct someObject

{

	 int i;

	 template <class Archive>

	 void serialize(Archive & ar, const unsigned int version)

    {

	    ar & i;

    }

}



struct OutStream

{

	 std::vector <someObject> someVector;



	 template <class Archive>

	 void serialize(Archive & ar, const unsigned int version)

	 {

		  ar & someVector;

	 }

}outStream;



// Another part of the code

outStream.someVector.swap(someOtherVector);



// Serialise

std::stringstream archive_stream;

boost::archive::text_oarchive archive(archive_stream);

archive << outStream;





// Send

 sendto(ServerSocket, archive_stream.str().c_str(), strlen(archive_stream.str().c_str())...

Client:



#include <boost/serialization/vector.hpp>



struct someObject

{

     int i;

	 template <class Archive>

	 void serialize(Archive & ar, const unsigned int version)

    {

	    ar & i;

    }

}



struct InStream

{

	 std::vector <someObject> someVector;



	 template <class Archive>

	 void serialize(Archive & ar, const unsigned int version)

	 {

		  ar & someVector;

	 }

}inStream;



// Another part of the code

// Deserialize

archive_stream << temp;

boost::archive::text_iarchive archive(archive_stream);

ZeroMemory(&inStream, sizeof(inStream));

archive >> inStream;



someOtherVector.swap(inStream.someVector);

However when I run this, on the server side, either it doesn't send proberly(lots of blank variables) or it says

Expression:vector iterator not dereferencable[/quote]

If it would help I can upload the whole source code (it's not that large). Any help is much appreciated!

Thanks,
Rowan.

wood_brian

193

November 03, 2012 07:29 PM

I would recommend using a more specific type than int in your marshalling code. The meaning of int can change between platforms.

This line:

ZeroMemory(&inStream, sizeof(inStream));

looks questionable. I didn't see the definition of that function, but maybe you don't need to call that function.

If you are interested in switching to binary serialization, I could be of more help.

hplus0603

11,917

November 03, 2012 11:50 PM

ZeroMemory() is the same thing as memset() with a 0 argument. You can only use it on POD (plain old data) values. Your InStream struct is not POD, as it contains a std::vector container.
What you probably want is instead:

inStream.someVector.clear();

Or, the idiomatic:

std::vector<someObject>().swap(inStream.someVector);

which is guaranteed to clean up any allocated memory right away, rather than just marking it as "use this next time something goes into this vector."

enum Bool { True, False, FileNotFound };

Using boost serialization to send a vector.

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