struct.unpack() on a stream

MRAB google at mrabarnett.plus.com
Fri Feb 27 13:10:39 CET 2009


Gabriel Genellina wrote:
> En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt 
> <eckhardt at satorlaser.com> escribió:
> 
>> I have a socket from which I would like to parse some data, how would 
>> I do
>> that? Of course, I can manually read data from the socket until unpack()
>> stops complaining about a lack of data, but that sounds rather inelegant.
>>
>> Any better suggestions?
> 
> Read until you get the required bytes; use the size attribute.
> 
The struct module has a function called "calcsize", eg:

 >>> import struct
 >>> struct.calcsize("<H")
2

That will tell you how many bytes to read.



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