How can I send this

  • Thread starter Thread starter nicolas ETIENNE
  • Start date Start date
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nicolas ETIENNE

Hello,

I want to send through Socket a struct

So, i'd like to do, as I did before in C++, something like

send((void*)myStruct);

where myStruct is a struct with basic types

But, I can't do this in c#

So what's the solution ?


How to send my struct ?

And the recepter side, how to match byte[] to a struct ?

Thanks for all

N.E Toulouse
 
Nicolas,
In C#, you would need to :

1) Mark your struct with the [Serializable] Attribute.
2) Using the BinaryFormatter, Serialize the struct to a byte array.
3) Send the byte array via the socket.
4) At the other end Receive the byte array
5) Again, using the BinaryFormatter, Deserialize the byte array back to an
instance
of your struct type.
Peter
 
1) Mark your struct with the [Serializable] Attribute.
2) Using the BinaryFormatter, Serialize the struct to a byte array.
3) Send the byte array via the socket.
4) At the other end Receive the byte array
5) Again, using the BinaryFormatter, Deserialize the byte array back to an
instance of your struct type.
Peter
Click to expand...

That's what I did...

My code :

public enum ESender

{

SCA,

SGI,

OTHER

}

[Serializable]

[ StructLayout( LayoutKind.Sequential )]

public unsafe struct MessageFormat

{

public ESender sender;

public int data1;

public int data2;

public double value;

}



This is the Struct



Somewhere in the sender , I do this :



System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

MemoryStream io = new MemoryStream();

fmt.Serialize(io, msg);

byte[] b = io.GetBuffer();

ClientSocket.Send(b);





This seems to work fine



And, in the receiver side, I do this ...



MessageFormat message;

if (msg.Length > 0)

{

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

MemoryStream io = new MemoryStream();

io.Write(msg, 0, msg.Length);

message = (MessageFormat)fmt.Deserialize(io);

}



But the fmt.Deserialize(io) line leads when executing to this : End of
Stream encountered before parsing was completed.



So, where am i wrong ? what's the deal I missed somehow ?



Nicolas





nicolas ETIENNE said:
Hello,

I want to send through Socket a struct

So, i'd like to do, as I did before in C++, something like

send((void*)myStruct);

where myStruct is a struct with basic types

But, I can't do this in c#

So what's the solution ?


How to send my struct ?

And the recepter side, how to match byte[] to a struct ?

Thanks for all

N.E Toulouse
Click to expand...
 
THat's what I did...

My struct is :
public enum ESender
{
SCA,
SGI,
OTHER
}

[Serializable]
[ StructLayout( LayoutKind.Sequential )]
public unsafe struct MessageFormat
{
public ESender sender;
public int data1;
public int data2;
public double value;
}

My sender does this :

MessageFormat msg = new MessageFormat();

msg.sender = ESender.SGI;
msg.data1 = 10;
msg.data2 = 20;
msg.value = 12323.435f;


System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

MemoryStream io = new MemoryStream();
fmt.Serialize(io, msg);
byte[] b = io.GetBuffer();

ClientSocket.Send(b);

and my receiver do this :

MessageFormat message;
if (msg.Length > 0)
{

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new

System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

MemoryStream io = new MemoryStream();

io.Write(msg, 0, msg.Length);
message = (MessageFormat)fmt.Deserialize(io);
}

but I only get a "End of Stream encountered before parsing was
completed."

So where Am i wrong in my code ?

Thanks a lot for your answer

Nicolas
 
Peter Bromberg said:
Use
io.Seek(0,0);

to reset to the beginning of the stream before deserializing.
Click to expand...

Or (IMO clearer - which parameter means which, without looking them
up?):

io.Position = 0;
 
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