Hmm...
What he has is a Stream at the server....
So a read should surely transfer back the results to the client (the
[out] direction).
The error is that the client unnecessarily uploads the bytes to the
server.
This behaviour is time- and bandwidth consuming.
Since Stream extends MarshalByRefObject it looks like the Stream methods
are not optimal modelled for remoting...
If true that is a little bit more than just a documentation error ;-))
My regards
Axel
-----Original Message-----
From: Stefan Holdermans [mailto:[EMAIL PROTECTED]]
Sent: Donnerstag, 15. August 2002 14:52
To: [EMAIL PROTECTED]
Subject: Re: [ADVANCED-DOTNET] Why has a MarshallByRefObject
Stream.Read(..) byte[] as IN Parameter
Dirk,
Actually, the correct CIL signature for Stream.Read is:
.method public hidebysig newslot virtual abstract
instance int32 Read([in][out] unsigned int8[] buffer,
int32 offset,
int32 count) cil managed
{
}
The corresponding C# syntax for this is :
public abstract int Read(ref byte[] buffer, int offset, int count);
in is not a valid parameter modifier in C#; so, I guess, this qualifies
as a documentation error.
Anyway, the out modifier causes the buffer to be transferred back. To
avoid this, you can provide a wrapper for the Read method on your server
component.
HTH,
Stefan
----- Original Message -----
From: Dirk Reuss
To: [EMAIL PROTECTED]
Sent: Wednesday, August 14, 2002 1:05 PM
Subject: Why has a MarshallByRefObject Stream.Read(..) byte[] as IN
Parameter
Hello,
I implemented a Stream for transfering data over the network.
On the remote (client) side I have a proxy to a stream object.
Client Code:
Stream stream = remoteserverobject.GetStream();
byte [] buffer = new byte[1024*1024];
stream.Read(buffer,0,1024*1024) ;
The buffer is transferd (1MB) from the client to the server and if the
Read
call returns the buffer is transfered back (OK). So the network volumn
is
2MB.IMO that's 1MB to much.
The signature for Read is:
[C#]
[Serializable]
public abstract int Read(
in byte[] buffer,
int offset,
int count
);
The buffer parameter is explicitly marked as in. I couldn't understand
why.
I think this happens not only for my channel.
Is there any workaround with remoting attributes?
Interop Marshalling Attributes don't work.
The transport is Tcpip with TcpIpChannel.
I tried:
byte [] buffer = new byte[0];
stream.Read(buffer,0,1024*1024) ;
Stream::Read(byte[] buffer...)
{
}
Regards,
Dirk
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