> I walk through the following code and when I reach the last line, which is
> highlighted in yellow from the debugger, I step forward and nothing happens.
> The yellow highlighted block goes away and the while loop is no longer
> executed.  The code is on a second thread.  After stepping forward, focus
> returns to the application or main form.  There are no errors or exceptions.
>
>         While True
>             Try
>
>                 If networkStream.CanWrite And networkStream.CanRead Then
>
>                     networkStream = tcpClient.GetStream()
>
>                     Dim bytes(tcpClient.ReceiveBufferSize) As Byte
>                     networkStream.Read(bytes, 0,
> tcpClient.ReceiveBufferSize)
>
>
> I did this change to see exactly which part of the above line was causing
> the problem.  The debugger does the same thing on the last line here.
>
>                     Dim mysize As Integer =
> CInt(tcpClient.ReceiveBufferSize)
>                     networkStream.Read(bytes, 0, mysize)
>
> Any idea how I can trouble shoot this?  Why does the debugger just suddenly
> go away?
>
> Thanks,
> Brett
>
>

"Adam Goossens" <adam.gooss***@gmail.com> wrote in message
news:%23eRK6kaQFHA.2356@TK2MSFTNGP14.phx.gbl...
> Brett,
>
> Remember that NetworkStream.Read() is a blocking call. When
> NetworkStream.Read() blocks, the debugger cannot continue because it's
> waiting for the Read() call to complete.
>
> Are you sure that data is read at all?
>
> Regards,
> -Adam.
>
> Brett wrote:
>> I walk through the following code and when I reach the last line, which
>> is highlighted in yellow from the debugger, I step forward and nothing
>> happens. The yellow highlighted block goes away and the while loop is no
>> longer executed.  The code is on a second thread.  After stepping
>> forward, focus returns to the application or main form.  There are no
>> errors or exceptions.
>>
>>         While True
>>             Try
>>
>>                 If networkStream.CanWrite And networkStream.CanRead Then
>>
>>                     networkStream = tcpClient.GetStream()
>>
>>                     Dim bytes(tcpClient.ReceiveBufferSize) As Byte
>>                     networkStream.Read(bytes, 0,
>> tcpClient.ReceiveBufferSize)
>>
>>
>> I did this change to see exactly which part of the above line was causing
>> the problem.  The debugger does the same thing on the last line here.
>>
>>                     Dim mysize As Integer =
>> CInt(tcpClient.ReceiveBufferSize)
>>                     networkStream.Read(bytes, 0, mysize)
>>
>> Any idea how I can trouble shoot this?  Why does the debugger just
>> suddenly go away?
>>
>> Thanks,
>> Brett

> I'm not sure the data is read.  Shouldn't it be read if the debugger comes
> back?  How do I tell?
>
> Why would it start doing this all of the sudden?  I do get data back from
> the Listener but that was before this started happening.   How can I be sure
> the problem is on the client or listener side?
>
> Thanks,
> Brett

"Adam Goossens" <adam.gooss***@gmail.com> wrote in message
news:%23IfPuKkQFHA.2136@TK2MSFTNGP14.phx.gbl...
> Hi Brett,
>
> It's probably a good bet that if the debugger can't advance past that
> line, then no data is coming in. If you're expecting data to be coming in
> at a constant rate, it sounds like a problem with the server.
>
> If the debugger steps to the next line, one of two things has happened:
> 1) Data was read without problem, or,
> 2) The Read() call has returned 0 (zero) indicating that all data has been
> read and the remote host has shut down the connection.
>
> Since neither of those two is happening, it is fair enough to assume that
> your listener is waiting for data to be received, but none is being sent.
>
> You might want to try stepping through your server code as well. If you
> step through both of them at once you might be able to find the point
> where something isn't quite right.
>
> Let me know how you go.
> Regards,
> -Adam.
>
>
> Brett wrote:
>> I'm not sure the data is read.  Shouldn't it be read if the debugger
>> comes back?  How do I tell?
>>
>> Why would it start doing this all of the sudden?  I do get data back from
>> the Listener but that was before this started happening.   How can I be
>> sure the problem is on the client or listener side?
>>
>> Thanks,
>> Brett