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Re: [Discuss-gnuradio] writing packet payloads to file

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] writing packet payloads to file
Date: Tue, 20 Nov 2012 13:07:38 -0500

On Fri, Nov 16, 2012 at 6:28 PM, Colleen Josephson <address@hidden> wrote:
> Hello all,
> I am researching a new coding algorithm. I am transmitting and coding a text
> file using payload_tx.py and then write the binary of the packet payload to
> a file to do offline analysis.
> I am having trouble writing packet payloads to file, however, because the I
> can't seem to find a way to get data out of a gr_message except for the
> to_string() method. If I try and convert the string back to binary (my
> attempt involved python's binascii module), I get an "Error: illegal char"
> message.
> This makes sense, since the data is still coded, and should not be a valid
> ascii string. But how can I get around this problem and write binary to
> file?
> --
> Colleen Josephson
> http://www.cjosephson.net
> Dept. of Electrical Engineering and Computer Science
> Massachusetts Institute of Technology
> Class of 2013


Have you tried to use struck.unpack?


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