[MonoDevelop] Using struct with socket C#

[Abe Gillespie]

You might want to look into using a toolkit for this stuff.  Have a look at
Protocol Buffers (a Google technology) for .Net.  A "getting started"
example for something like you're doing may be found here:

http://code.google.com/p/protobuf-net/source/browse/trunk/QuickStart/3+Sockets.cs?spec=svn212&r=171

On Mon, Mar 28, 2011 at 4:05 PM, Tom Spink <tspink at gmail.com> wrote:

> Hello,
>
> There are a couple of problems with this approach.
>
> Firstly, you don't take into account the endianness of the two systems
> - for example, Machine A could be a little-endian machine, while
> Machine B might be a big-endian machine.
>
> This means that when you convert an integer to it's raw bytes on one
> machine, it'll be backwards when you convert it back on the other
> machine.  This is of course a major problem when you're trying to send
> information across the network, when you don't know what type of hosts
> are communicating.  The way to solve this is to agree on the
> byte-order for the transfer over the network, and then convert each
> field one-at-a-time to the correct byte order when building the
> packet.  Traditionally, network byte order or big-endian is used.
>
> You should use a BinaryReader, and read/write each element one-by-one
> into the structure, to make sure you're getting the byte ordering
> correct.
>
> Secondly, what's the type of the last element in the structure?  What
> is 'signals'?
>
> -- Tom
>
> On 27 March 2011 21:04, Leonel Florin Selles
> <leonel06013 at cfg.jovenclub.cu> wrote:
> > Hi friend:
> >
> > Well I have a problem here, I'm creating a socket application that have a
> > server and a client, and they share information in form of struct, I
> mean,
> > the server send an struct to the client and the client work with that
> > information and forward this information in the same struct to the
> server,
> >
> > I'm using the Marshal class to convert the struct into a byte[] and I
> > prove this between to different struct in the same program, but, when I
> > send the struct transform it in to byte[] to the client, it get the
> byte[]
> > but when i try to use the marshal class to restore the byte[] in to
> struct
> > the program closes without explanation, an example of what I'm doing
> >
> > the struct I'm use
> >
> > public struct cliente
> >        {
> >                public string clientName;
> >                public int clientPid;
> >                public string host;
> >                public string bd;
> >                public string user;
> >                public string pass;
> >                public string usersCheck;
> >                public bool systemTryIcon;
> >                public string adminpass;
> >                public signals orden;
> >        }
> >
> > and the two method to convert struct to byte[], and byte[] to struct
> >
> > public class dataManager
> > {
> >    public static byte[] structToByte (Object structura)
> >        {
> >                int size = Marshal.SizeOf (structura);
> >                IntPtr apuntador = Marshal.AllocHGlobal (size);
> >                byte[] datos = new byte[size];
> >
> >                Marshal.StructureToPtr (structura, apuntador, false);
> >                Marshal.Copy (apuntador, datos, 0, size);
> >                Marshal.FreeHGlobal (apuntador);
> >
> >                return datos;
> >        }
> >     public static System.Object ByteToStruct (byte[] listaByte, Type
> > tipoStruct)
> >        {
> >                int size = Marshal.SizeOf (tipoStruct);
> >                if (size > listaByte.Length)
> >                        return null;
> >                IntPtr apuntador = Marshal.AllocHGlobal (size);
> >                System.Object objeto = new Object ();
> >
> >                Marshal.Copy (listaByte, 0, apuntador, size);
> >                objeto = Marshal.PtrToStructure (apuntador, tipoStruct);
> >                Marshal.FreeHGlobal (apuntador);
> >
> >                return objeto;
> >        }
> > }
> >
> > and using Socket to create the server and to conect the client
> >
> > the server
> >
> > Socket socketServer = new Socket (AddressFamily.InterNetwork,
> > SocketType.Stream, ProtocolType.IP);
> > socketServer.Bind (new IPEndPoint (IPAddress.Any, puerto));
> > socketServer.Listen (100);
> >
> > the client
> >
> > ocket cliente = new Socket (AddressFamily.InterNetwork,
> SocketType.Stream,
> > ProtocolType.IP);
> > cliente.Connect ("localhost", 4069);
> >
> > //converting the struct to byte[]......
> >
> > cliente.Send (sendData, 0, sendData.Length, SocketFlags.None);
> >
> >
> > what can you tell my about?
> >
> > _______________________________________________
> > Monodevelop-list mailing list
> > Monodevelop-list at lists.ximian.com
> > http://lists.ximian.com/mailman/listinfo/monodevelop-list
> >
>
>
>
> --
> Tom Spink
> _______________________________________________
> Monodevelop-list mailing list
> Monodevelop-list at lists.ximian.com
> http://lists.ximian.com/mailman/listinfo/monodevelop-list
>
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