Minimal grc python block

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Minimal grc python block

Evening all. I only recently (yesterday) started working with gnuradio and am having some trouble getting a minimal grc python block going. I've found a number of references in this mailing list and elsewhere (and lots of broken links) but just can't seem to piece it all together. Some guidance would be greatly appreciated.

My current goal is just to create a block in grc, it doesn't even have to do anything yet. Here's what I've done so far. I've added these to .bashrc:

export PYTHONPATH=$PYTHONPATH:/home/user/mygnuradioblocks
export GRC_BLOCKS_PATH=$GRC_BLOCKS_PATH:/home/user/mygnuradioblocks

As suggested by (I've tried the other two methods for specifying the .xml path as well):


And added the following two files to this folder (based on https://github.com/guruofquality/grextras/wiki/Blocks-Coding-Guide):


#!/usr/bin/env python

from gnuradio import gr
import block_gateway

class my_first_block(gr.block):
  def __init__(self):
    gr.block.__init__(self, name = "my first block", in_sig=None, out_sig=None)

  def work(self, input_items, output_items):
    return 0


<?xml version="1.0"?>
    <name>MY: FIRST BLOCK</name>
    <import>import mytestblock as mtb</import>
        <name>my param1</name>
MY TEST BLOCK: Bleh, hope this works!

I however can't get grc to recognize this block, In addition I've tried moving these two files to the system xml and py directories respectively:


And even modifying files in those two folders to a minimal form. In short, I'm having a fairly hard time to get my first python grc block going, if anyone could point me in the right direction for creating a minimal grc python block it would be much appreciated.
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Re: Minimal grc python block

FYI I just solved the problem. The <key> and <category> tag order was reversed. I didn't know that the xml format was so strict. Well on my way now.


The blank lines in my xml data should have contained the  tags, they were lost in copying the xml over for some reason.