Re: [Discuss-gnuradio] Reading ZMQ messages in Python

[Marcus Müller]

Hi,

the "right way" to do this is use PMT's python bindings:

import pmt
s='\n\x08\x00\x00\x00\x01\x01\x00?\xe4\xbe\x83\x00\x00\x00\x00'
p = pmt.deserialize_str(s)
python_numpy_array = pmt.pmt_to_python.pmt_to_python(p)

Best regards,
Marcus


On 08.09.2015 20:17, Daniel Mazzer wrote:
> Hello,
>
> I have a flowgraph that send ZMQ PUB messages generated by a custom
> OOT block. The messages transmitted by GNURadio ZMQ PUB block are
> received by a Python application, using a standard ZMQ Library.
>
> [custom_oot_block] ---(GNURadio message)---> [ZMQ Publisher]
> .....(ethernet).....> [Python ZMQ SUB Library]
>
> This is the part of the code of the OOT block that creates the message:
>
> -----
> float *outPdPfa = (float *) output_items[0];
>
> pmt::pmt_t msg = pmt::init_f32vector(1, outPdPfa);
> message_port_pub(pmt::mp("hard_decision"), msg);
> -----
>
> In Python, I receive the transmitted message and this is some of the
> strings that are received:
>
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe4\xbe\x83\x00\x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe5R\xb5 \x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe4B0\xa0\x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe4\xa3\\\xa0\x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe5jV\xa0\x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe4\xf8\x00\x00\x00\x00\x00'
> '\n\x08\x00\x00\x00\x01\x01\x00?\xe4\x90\x00\x00\x00\x00\x00'
>
> How do I convert these strings to a floating number value?
>
> Thank you.
>
> Regards,
> Daniel
>
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