Buffer overlap

[Kenneth H. Young]

I am getting over lapping data while sending and receiving data in a tcp listener I am working on. How does one reset or clear the buffer or bytes so they don't carry over to the next send or receive?

Thanks in advance!

Partial Example:

' Client sends:
TempS = curAdd.ToString & ".............. ............... ............... ............... ............... ............... ............"

' Padding the end of the IP address so I can trim(".") when received because I couldn't trim the free space at the end.

Buffer = System.Text.Enc oding.Default.G etBytes(TempS.T oString)

Client.GetStrea m().Write(Buffe r, 0, Buffer.Length)



' The Server Receives:

While Not StopListener

If CurSocket.Avail able > 0 Then

' 1. Receive IP Address from client:

Bytes = CurSocket.Recei ve(Buffer, Buffer.Length, 0)

SyncLock CurThread

clientV = (System.Text.En coding.Default. GetString(Buffe r)).ToString

clientV = clientV.Trim(". ")

Buffer.Clear(Bu ffer, Buffer.Length, 0)

On the next send / receive I am getting leftover ........... in the string.

THANKS!

[Mattias Sjögren]

Re: Buffer overlap

Kenneth,

I'm not sure I understand the problem, but ...

[color=blue]
>Buffer = System.Text.Enc oding.Default.G etBytes(TempS.T oString)[/color]

I'd recommend using an encoding other than Default (such as UTF-8),
because the default can be different on different systems.

[color=blue]
>Buffer.Clear(B uffer, Buffer.Length, 0)[/color]

Since you specify a length of xero here, nothing will be cleared.



Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Kenneth H. Young]

Re: Buffer overlap

When I send this: TempS = curAdd.ToString &
".............. ............... ............... ............... ............... ............... ..........."
to the server I then trim(".") to get rid of the periods. Then the server
sends four messages back to the client depending on the processes that takes
place. Finally the client Sends: "PCNAME-Scheduled" to the server and the
server receives "........ti ng". It appears as though its pieces of previous
buffer information.

I hope I explained the issue!

Thanks for the HELP!





"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:eWMTwuP0FH A.3488@TK2MSFTN GP09.phx.gbl...[color=blue]
> Kenneth,
>
> I'm not sure I understand the problem, but ...
>
>[color=green]
>>Buffer = System.Text.Enc oding.Default.G etBytes(TempS.T oString)[/color]
>
> I'd recommend using an encoding other than Default (such as UTF-8),
> because the default can be different on different systems.
>
>[color=green]
>>Buffer.Clear( Buffer, Buffer.Length, 0)[/color]
>
> Since you specify a length of xero here, nothing will be cleared.
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

[Peter Huang [MSFT]]

Re: Buffer overlap

Hi

Firstly I think you may try the code in the link below for client/server.
TcpListener Class
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfsystemnets ocketstcplisten erclasstopic.as p
TcpClient Class
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfSystemNetS ocketsTcpClient ClassTopic.asp

If you still have any concern, can you build a simple reproduce sample and
send to me via removing "online" from my email address.

Best regards,

Peter Huang
Microsoft Online Partner Support

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