Re: [Discuss-gnuradio] About Polymorphic types in gnuradio

[Marcus Müller]

Ah, so it's a uniform vector of _u_signed _8_bit integers.
Try pmt::u8vector_ref(VECT, k), where k is the index of the element you want to get. To modify, use pmt::u8vector_set(pmt_t, index,value).

Since your pmt is really just a wrapper around memory-contiguous uint8_ts , you can also "cheat" and directly use the uint8_t* pmt::u8vector_writable_elements(pmt_t v, size_t & len) method, that will give you a C-array/pointer to the first element.

All these functions are described on
https://gnuradio.org/doc/doxygen/namespacepmt.html#a73605a64c44ec7f12f5f84bb98e2cae3
as linked from the page I mentioned below.

Best regards,
Marcus

On 06.01.2016 17:13, Gabriel Pechiarovich wrote:

I'm using message strobe to send the data in the Message PMt parameter I used:

pmt.cons(pmt.make_dict(), pmt.make_u8vector(8,0x42 ))

then comes my block, and to read the output i'm using Message Debug block.

2016-01-06 10:55 GMT-05:00 Marcus Müller <address@hidden>:

Hi Gabriel,

do you know what kind of PMT VECT is? pmt_t is a container, and might contain a lot of different things.
Is it a pmt::vector, or a pmt::uniform_vector, or a list, or something else?

For an overview, I'd like to point you to the polymorphic types page in the GNU Radio manual [1].

Best regards,
Marcus

[1] https://gnuradio.org/doc/doxygen/page_pmt.html

On 06.01.2016 16:10, Gabriel Pechiarovich wrote:

Hi, I've been working in oot modules in gnuradio for a while, but recently I've been trying to program blocks who can handle messages.

I've extracted the input data and replicated it at the output, like this:

pmt::pmt_t META = pmt::car(PDU);

pmt::pmt_t VECT = pmt::cdr(PDU);

        std::cout << "Vect: " << VECT<< '\n';

message_port_pub(pmt::mp("out_pdu"), pmt::cons(META, VECT));

But I can't understand how to handle VECT, I want to change the VECT values; add some values, basicaly operate this VECT.

If anyone can help me I'll be gratefull.

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Gabriel Pechiarovich Salas

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Red Dragon Games

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