Re: [Discuss-gnuradio] Call get_tags_in_range in sink block

[Josh Blum]

On 08/06/2012 03:44 AM, Johannes Demel wrote:
> Hello List,
> 
> I call the 'get_tags_in_range' function in 'work' in my sink block and
> get the following output:
> thread[thread-per-block[10]: <gr_block my_block_name (14)>]:
> gr_block_detail::n_output_items
> all code after get_tags_in_range is never executed and the block is
> never scheduled again. (Without the 'get_tags_in_rage' call it is
> executed multiple times)
> 
> My quick fix to this problem is to change my_block to a standard block
> and just print some dummy output to the out port. This output is passed
> to a null_sink.
> This way it works just fine. But imho this is an ugly fix.
> 
> This is the exact call of get_tags_in_range
> std::vector <gr_tag_t> v;
> get_tags_in_range(v,0,nitems_written(0),nitems_written(0)+1);


Looks like the wrong count to use, check the coding guide, its items
read:
http://gnuradio.org/redmine/projects/gnuradio/wiki/BlocksCodingGuide#Reading-stream-tags

-josh

> 
> my flowgraph looks something like this:
> source-->tagging_block-->sink
> 
> and fixed:
> source-->tagging_block-->tag_reading_block-->null_sink
> 
> all streams are byte vectors.
> 
> 
> my system:
> OS: Xubuntu 12.04 x64
> Intel Core i3-2330M
> VGA: Intel Corporation 2nd Generation Core Processor Family Integrated
> Graphics Controller (rev 09)
> 4gb RAM
> 
> 
> 
> 
> Johannes
> 
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