Trouble parsing JSON in Python

Question

I have a socket in C sending this char[] (String) through a TCP socket:

{"time":0, "latitude":0.0000000, "longitude":0.0000000, "heading":0.000000, "roll":0.000, "pitch":0.000, "yaw":0.000}

It seems like it should be recognized as valid JSON in my Python client, but running:

parsed = json.loads(sock.recv(1024).decode('utf-8'))

Generates the following error:

ValueError: Extra data: line 1 column 117 - line 1 column 1024 (char 117 - 1024

Maybe C is throwing in some extra bits that Python doesn't like.

Figuring this was the case, I trying calling decode('ascii', 'ignore') on the input String hoping this would strip these characters out, but nothing has worked so far.

Any help would be greatly appreciated!

If I print sock.recv(1024).decode('utf-8') I get {"time":0, "latitude":0.0000000, "longitude":0.0000000, "heading":0.000000, "roll":0.000, "pitch":0.000, "yaw":0.000}, as I would expect. — James Taylor
– James Taylor, Commented May 22, 2015 at 21:35
@JamesTaylor: and what if you use print repr(sock.recv(1024).decode('utf-8'))? — Martijn Pieters
– Martijn Pieters, Commented May 22, 2015 at 21:36
Oh. I get the JSON String I want trailed by a lot of \x00\x00\x00 characters. These are probably the problem. Can I get rid of them? — James Taylor
– James Taylor, Commented May 22, 2015 at 21:39

derricw · Accepted Answer · 2015-05-23 01:18:18Z

2

It is common to have to use:

.strip('\x00')

in Python to remove null terminators from C strings.

edited May 23, 2015 at 1:18

answered May 22, 2015 at 21:40

derricw

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