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[Discuss-gnuradio] writing packet payloads to file

From: Colleen Josephson
Subject: [Discuss-gnuradio] writing packet payloads to file
Date: Fri, 16 Nov 2012 18:28:13 -0500

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
Dept. of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
Class of 2013

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