mySocket.GetStream.EndRead = 0! Why!

[Drstein99]

Regarding sockets;

Sometimes my .endread command will return 0 bytes. Its being executed in a async callback function from:

.beginread(readBuffer, 0, READ_BUFFER_SIZE, AddressOf Me.StreamReceiver, strMessage)

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Why does the command execute, and when I conduct my .endread function returns 0 bytes?

Is it issueing a time-out, or keep-alive die? How can I figure out the NATURE of WHY that function was called (as a result of the .beginread) - because when it tells me 0 btyes are available to read from the stream; i'm under the impression its trying to send a message other then "data available" - as a matter of fact i am sure of it, because the remote / socket application on the client test pc shows that it hasnt sent any information or data.

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DrStein99

 

[HJB417]

Streams only return zero (0) at the end of the stream.

The same applies to sockets and networkstreams and for sockets. For sockets though

If the remote host shuts down the Socket connection with the Shutdown method, and all available data has been received, the Receive method will complete immediately and return zero bytes.

 

[Drstein99]

Direct quote from the vs.net help file:

"If the remote host shuts down the Socket connection and all available data has been received, the EndRead method will complete immediately and return zero bytes."

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The client and server seem to work well, until I put my app in the background and run another application. Then it will trigger "0" bytes recieved, and obviously shut down the SOCKET. I dont want my sockets to get disconnected (and I write code naturally to re/connect the sockets).

Can anyone reccomend a method of me debugging to keep sockets open, steady and reliable?
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DrStein99

 

[HJB417]

You should display/post code that reproduces the problem. I'm pretty sure you're doing something wrong.

 

[Drstein99]

My code is lengthy, and has been worked on for about 2 months now. I fear it may cause more confusion, but its necessary for someone to help me. For example, I have procedures that start timers, and time-out if a connection isnt acquired in a certain time. another timer that will destroy the object if it doesnt get a response back from server (after initial login)..... this is a tough one.