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

[Stephen Harrison]

try struct.unpack() 

On Tue, Sep 8, 2015 at 11:17 AM, Daniel Mazzer <address@hidden> 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

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio