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Re: [Discuss-gnuradio] segmentation fault when using a new added block

From: intermilan
Subject: Re: [Discuss-gnuradio] segmentation fault when using a new added block
Date: Mon, 18 Apr 2011 16:20:13 +0800

Hi all:
      I have already figured out my problem I mentioned in my last e-mail. That is because I installed two
versions of GNU Radio in my computer.So I get the error "segmentation fault".But there is another question.
After I uninstalled one version of GnuRadio (now i use gnuradio3.3.0),I use the create-gnuradio-out-of-tree-project
command to add a new package which named test.And I did not change the block in the package,so they still
were test.square_ff() and test.square2_ff().When I run the test code which is a simple python code,I got this error:
AttributeError: 'module' object has no attribute 'square_ff'.So how can I do to figure out this problem?I hope someone
can tell me .Thanks in advance.


From: address@hidden
To: address@hidden
Date: Thu, 14 Apr 2011 16:09:01 +0800
Subject: [Discuss-gnuradio] segmentation fault when using a new added block

hi all:
    I want to use the gr-howto-write-a-block-3.3.0 (my version of the Gnuradio is 3.3.0)to add a new package
or a new block to the gnuradio and grc. At first I did not change anything in the gr-howto-write-a-block-3.3.0,
so the name of the new package should be howto,and the name of the block should be howto.square_ff() and
howto.square2_ff().I run the follow command as follow:
    sudo ./bootstrap
    sudo ./configure --prefix=/usr/local
    sudo make
    sudo make check
    sudo make install
 After all commands done,everything seems fine (no error appear after make check)and the package looks like  been installed.
Then I write a small python program to test the new block.Here are the codes:
#! /usr/bin/env python
from gnuradio import gr
import howto
class example_block(gr.top_block):
    def __init__(self):
        src = "">                                 True)
        thr = gr.throttle(gr.sizeof_float,
        sqr =howto.square_ff()
        dst = gr.file_sink(gr.sizeof_float,


if __name__ == '__main__':
    tb = example_block()

But when I run the program in the shell, there is error "segmentation fault".I do not know why does this error happen.
I did not change anything in the gr-howto-write-a-block-3.3.0. I hope someone can help me to fix this problem and
tell me why this error happen.
Thanks in advance.


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