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

[Daniel Mazzer]

Hi Marcus,

I was missing the "deserialize" call. I'll try it tomorrow.

Thank you.
Regards,
Daniel


On Tue, Sep 8, 2015 at 6:28 PM, Marcus Müller <address@hidden> wrote:
> 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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