Re: [Discuss-gnuradio] PMT blobs in Python

[Marcus Müller]

I can't really test this right now,
but you could insert
  %include <cdata.i>
into your project's swig file[1]; this should generate a python method
   cdata(ptr, length)
that you can feed your blob_data() to. I'm not quite sure that WILL
work as is, maybe you will need a C(++) wrapper that simply returns
an array of known type (that is, int* instead of void*) that you can
yourself wrap into a SWIG array_class (like in the linked document).

Greetings
Marcus

[1] http://www.swig.org/Doc1.3/Library.html#Library_nn7
On 08/04/2013 04:37 AM, Peter Horvath wrote:

Hi,

can I convert a blob created by my C++ code (unsigned chars) to a Python
list or NumPy array?

pmt.blob_data() returns a 'SwigPyObject' with which I can't do anything.
Passing it to a NumPy array constructor doesn't seem to do the job.

The blobs are in a tuple:
pmt::pmt_t b1 = pmt::make_blob(a, a_length);
pmt::pmt_t b2 = pmt::make_blob(b, b_length);
return pmt::make_tuple(b1, b2);

And I try to check the contents of b1 in QA code like this:
res = my_test_function()
b1 = pmt.blob_data(pmt.tuple_ref(res, 0))
b1_len = pmt.blob_length(pmt.tuple_ref(res, 0))

Thanks,
Peter

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