Also, I've been assuming that nitems_written/read is from gr_block_detail,
and add_item_tag is from gr_block and that they have both been swigged,
since you used them in your example. Is it possible that they haven't been?
Thanks
-Anisha
On Fri, Jul 13, 2012 at 3:57 PM, Anisha Gorur <at...@virginia.edu> wrote:
> I don't think I'm writing the work function...
>
>
> def work(self, input_items, output_items):
> item_index = 1 #which output item gets the tag?
> offset = self.nitems_written(0) + item_index
> key = pmt.pmt_string_to_symbol("example_key")
> value = pmt.pmt_string_to_symbol("example_value")
>
> self.add_item_tag(0, offset, key, value)
> #call work function
> self.work(self.gr_vector_source_x_0, self.gr_file_sink_0)
>
> Error: AttributeError: 'gr_top_block_sptr' object has no attribute
> 'nitems_written'
>
>
> On Fri, Jul 13, 2012 at 3:25 PM, Josh Blum <j...@ettus.com> wrote:
>
>>
>>
>> On 07/13/2012 12:08 PM, Anisha Gorur wrote:
>> > Thanks for the examples, I will definitely be looking into them!
>> > As for links, This one: http://gnuradio.org/cgit/jblum.git/log/?h=nextis
>> > broken, it comes from one of the blocks coding guide here:
>> >
>> http://gnuradio.org/redmine/projects/gnuradio/wiki/BlocksCodingGuide/diff/2which
>> > i found really helpful.
>> >
>>
>> There was a lot of work in various branches off of gnuradio which I had
>> merged into next. That branch is gone, and that work has been combined
>> into the GrExtras project. The link and relevant coding guide was
>> moved/updated: https://github.com/guruofquality/grextras/wiki
>>
>> > I also had one more quick question, I'm getting this error:
>> > 'gr_top_block_sptr' object has no attribute 'add_item_tag', though I
>> > thought add_item_tag was inherited from gr_block.
>> > Thanks again!
>> >
>>
>> Not sure, you might send a code snippet. It looks like you are calling a
>> method of the top block, and not from the block's work function?
>>
>> -josh
>>
>> > On Fri, Jul 13, 2012 at 2:40 PM, Josh Blum <j...@ettus.com> wrote:
>> >
>> >>
>> >>
>> >> On 07/13/2012 10:08 AM, Anisha Gorur wrote:
>> >>> Thanks!
>> >>> Do you by any chance have links to specific code examples that could
>> help
>> >>> out? I've been trying to look at old examples you have posted to
>> others
>> >> on
>> >>> this forum, however, some of the links from github seem to be broken.
>> >>>
>> >>
>> >> Well, I dont have an example from python, but its just the same thing
>> >> without semicolons. So this should be very helpful:
>> >> http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/examples/c++/
>> >>
>> >> Let me know if the links are bad on one of my wiki pages.
>> >> At least I can fix those :-)
>> >>
>> >> -josh
>> >>
>> >>> On Fri, Jul 13, 2012 at 12:52 PM, Josh Blum <j...@ettus.com> wrote:
>> >>>
>> >>>>
>> >>>>
>> >>>> On 07/13/2012 08:51 AM, Anisha Gorur wrote:
>> >>>>> Hello all,
>> >>>>> I've been trying to work with stream tags in python, mainly using
>> the
>> >>>>> grextras blocks coding guide
>> >>>>> here:https://github.com/guruofquality/grextras/wiki/Blo...
>> >>>>> <
>> >>>>
>> >>
>> https://github.com/guruofquality/grextras/wiki/Blocks-Coding-Guide#wiki-the-work-function
>> >>>>> .
>> >>>>>
>> >>>>> I've set up a very simple flow graph, just a vector source, throttle
>> >> and
>> >>>>> file sink, and I would like to place a tag on the first element of
>> the
>> >>>>> vector that contains time metadata. I'm using this code:
>> >>>>>
>> >>>>> def work(self, input_items, output_items):
>> >>>>> item_index = ? #which output item gets the tag?
>> >>>>
>> >>>> set item_index to x so the tag gets associated with
>> outputs_items[0][x]
>> >>>>
>> >>>>> offset = self.nitems_written(0) + item_index
>> >>>>> key = pmt.pmt_string_to_symbol("example_key")
>> >>>>> value = pmt.pmt_string_to_symbol("example_value")
>> >>>>>
>> >>>>> #write at tag to output port 0 with given absolute item offset
>> >>>>> self.add_item_tag(0, offset, key, value)
>> >>>>>
>> >>>>> I think the problem has something to do with not implementing the
>> >>>>> correct modules. My question is, what are the appropriate modules to
>> >>>>> import to read and write stream tags in python?
>> >>>>>
>> >>>>
>> >>>> You might want to look more that that coding guide, at lot of the
>> >>>> snippets are just work functions, but many contain full class
>> >>>> definitions with import statements. For example:
>> >>>>
>> >>>> from gnuradio import gr
>> >>>> import gnuradio.extras
>> >>>>
>> >>>> class my_sync_block(gr.block):
>> >>>>
>> >>>> def __init__(self, args):
>> >>>> gr.block.__init__(self, name="my block",
>> in_sig=[numpy.int32],
>> >>>> out_sig=[numpy.int32])
>> >>>>
>> >>>> def work(self, input_items, output_items):
>> >>>> #work stuff...
>> >>>> return len(output_items[0])
>> >>>>
>> >>>> -josh
>> >>>>
>> >>>> _______________________________________________
>> >>>> Discuss-gnuradio mailing list
>> >>>> Discuss-gnuradio@gnu.org
>> >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>>
>>
>
>
> --
> Anisha Gorur
> Class of 2012
> Electrical Engineering
>
>
--
Anisha Gorur
Class of 2012
Electrical Engineering
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