Re: [Discuss-gnuradio] Problems creating my own GRC blocks

[Josh Blum]

On 01/23/2011 05:09 AM, Iain Young, G7III wrote:
> Hi Guys,
> 
> I am trying to add my own block to GRC for Doppler correction. To be
> honest, the code itself is a very simple python UDP Client that talks
> to predict.
> 
> The code itself works fine, and talks to predict. So I decided to
> create a block for GRC. This is the XML for the block:
> 
> <?xml version="1.0"?>
> <block>
>     <name>Predict Doppler</name>
>     <key>get_doppler</key>
>     <category>Misc</category>
>     <import>from predict get_doppler</import>
>     <callback></callback>

it has to validate block.dtd, the <callback>... should be after <make>...

-Josh

>     <make>predict.get_doppler($predhost, $predport, $satellite)</make>
>     <param>
>         <name>Host</name>
>         <value>localhost</value>
>         <key>predhost</key>
>         <type>string</type>
>     </param>
>     <param>
>         <name>Port</name>
>         <key>predport</key>
>         <value>1210</value>
>         <type>int</type>
>     </param>
>     <param>
>         <name>Satellite</name>
>         <value></value>
>         <key>satellite</key>
>         <type>string</type>
>     </param>
>     <source>
>         <name>out</name>
>         <type>float</type>
>     </source>
> </block>
> 
> 
> However, I get the following when starting GRC:
> 
> Warning: Block validation failed:
> 
> /home/iain/.grc_gnuradio/predict.xml:2:0:ERROR:VALID:DTD_NOT_PCDATA:
> Element block was declared #PCDATA but contains non text nodes
> /home/iain/.grc_gnuradio/predict.xml:4:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element key
> /home/iain/.grc_gnuradio/predict.xml:5:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element category
> /home/iain/.grc_gnuradio/predict.xml:6:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element import
> /home/iain/.grc_gnuradio/predict.xml:7:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element make
> /home/iain/.grc_gnuradio/predict.xml:8:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element param
> /home/iain/.grc_gnuradio/predict.xml:10:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element value
> /home/iain/.grc_gnuradio/predict.xml:11:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element key
> /home/iain/.grc_gnuradio/predict.xml:12:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element type
> /home/iain/.grc_gnuradio/predict.xml:14:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element param
> /home/iain/.grc_gnuradio/predict.xml:16:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element key
> /home/iain/.grc_gnuradio/predict.xml:17:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element value
> /home/iain/.grc_gnuradio/predict.xml:18:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element type
> /home/iain/.grc_gnuradio/predict.xml:20:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element param
> /home/iain/.grc_gnuradio/predict.xml:22:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element value
> /home/iain/.grc_gnuradio/predict.xml:23:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element key
> /home/iain/.grc_gnuradio/predict.xml:24:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element type
> /home/iain/.grc_gnuradio/predict.xml:26:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element source
> /home/iain/.grc_gnuradio/predict.xml:28:0:ERROR:VALID:DTD_UNKNOWN_ELEM:
> No declaration for element type
>         Ignoring: /home/iain/.grc_gnuradio/predict.xml
> 
> 
> While googling, I only found one reference to this (back in 2009), and
> that suggested that I needed a callback, even if it was empty, so I
> added it, but to no avail.
> 
> I've compared my block to the others bundled with GRC, and can't see
> anything that stands out. I've also updated to the latest git, but
> still no luck (Previous was from sometime around Christmas/New Year)
> 
> Anyone have any ideas on what I've missed ?
> 
> 
> Thanks in Advance & Best Regards
> 
> Iain
> 
> 
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