[Tutor] sockets

[Sean 'Shaleh' Perry]

On Wednesday 09 July 2003 17:20, Rob Hudson wrote:
>
> data = sockobj.recv(1024)
>
>
> I call it like this:
> python socket-test.py 132.163.4.203 13
>
>
> My question is:  What if the data the server sends is more than 1024
> bytes?  Python can't do this, right?
>
> while (recv = sockobj.recv(1024)):
>     data += recv
>
> Specifically, I think Python can't make an assignment inside a
> conditional.  Would you get the data, then check for NULL and break if
> the data is empty?  Or check for EOF?  Something like that?
>

you are correct, no assignment in conditionals.

One of the tricks to socket programming is the value passed to recv() is a 
MAXIMUM.  The OS may decide to only give you 1/3, 1/8, 5/8, etc. of that 
value.  So you have to check that you have received all of the data.
This leads to the recv being called in a loop and the value being checked 
until the proper amount has been received or the data contains what you 
expect it to.