rare events in TCP

[mark smit]

Hello,


Could somebody clear this up for me. If a TCP packet becomes fragmented into two packets, does winsock give two notification messages? or is this somthing I should worry about? The reason I am asking is that I am trying to send a structure through TCP and I dont have any way of checking that I recieved the whole thing. I have also tried the loop below but it seems to have some problems.

I would also like to know what is the biggest string I can use with TCP SEND when the baud rate of your modile phone is only 2400. I suspect it would be araound 200 to 300.

type CRecord
    Well    as long
    Summary as string * 256
end type

Packet = ""
Buffer = ""

do
    tcp recv hClient,len(Record),Buffer
    if err then msgbox str$(errclear):end
    Packet = Packet & Buffer
loop len(Buffer)

lset Record = Packet

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Cheers

[Scott Turchin]

Technically you are at an application layer and the stack that fragments the packets is below you on the OSI model.


So technically if you are not getting your data completely then hmmmmm


See, TCP/IP Is byte oriented, the TCP/IP Stack (protocol on the machine) handles the fragmentation by verifying all bytes were received.

If all bytes were not received it's below your application layer and there's something else wrong either with the stack or the code itself.

Offhand it looks like you are not receiving it all based on the code, any GPF's occuring????

Try doing something like this:

  If Not Eof(hTcp) Then
     Tcp Line hTCP, Buffer
  End If

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Scott
mailto:[email protected][email protected]</A>

[mark smit]

Hello Scott!


The reason I ask the above question was because in the PBDLL help file it says TCP does not reassemble fragmented packets. But acording to what you have said I shouldn't worry about that? As far as I know I have never not recieved a complete packet but I just want to make sure.

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Cheers