Re: [Discuss-gnuradio] error with running wifi_loopback.grc from gr-ieee802-11

[Bastian Bloessl]

Hi,

On 08/13/2015 04:20 PM, Tian Alvin wrote:
> "mylog(boost::format("encoding: %1% - length: %2% - symbols: %3%")
> % d_encoding % d_len % d_copy_symbols);"
>
> To make it work, I still need change it to
> "std::string temp = (boost::format("encoding: %1% - length: %2% -
> symbols: %3%")
> % d_encoding % d_len % d_copy_symbols).str();
>
> Actually, I don't really understand the difference between these two.
> What does this change mean? Does the problem relate to log4cpp?

This was suggested to debug the problem, not as a fix.

The problem is described in the issue you referenced (scroll down) and 
hopefully fixed by this commit
https://github.com/bastibl/gr-ieee802-11/commit/77548c73a95b0460250ef477e309190f20bf8d95

Please update the module with git.

Best,
Bastian

> On Thu, Aug 13, 2015 at 3:07 PM, Bastian Bloessl <address@hidden
> <mailto:address@hidden>> wrote:
>
>     Hi,
>
>     yes, this is how it is supposed to look. But please read the posts
>     at the bottom of the thread. Actually, it should work without
>     modifications now.
>
>     Best,
>     Bastian
>
>     On 08/13/2015 04:03 PM, Tian Alvin wrote:
>
>         Hi Bastian,
>
>         I followed the suggestion on github:
>
>         *Use*
>
>         "std::string temp = (boost::format("encoding: %1% - length: %2% -
>         symbols: %3%")
>         % d_encoding % d_len % d_copy_symbols).str();
>         //mylog(temp);"
>
>         *to change* : in the ofdm_decode_signal.cc# L197&L198
>         "mylog(boost::format("encoding: %1% - length: %2% - symbols: %3%")
>         % d_encoding % d_len % d_copy_symbols);"
>
>         Now I can get the below result:
>
>         Inline image 1
>
>         Does this mean the flow graph has been run correctly?
>
>         Paul----Thank you very much for your suggestion and sharing!
>
>
>
>         On Thu, Aug 13, 2015 at 1:59 PM, Bastian Bloessl
>         <address@hidden <mailto:address@hidden>
>         <mailto:address@hidden <mailto:address@hidden>>> wrote:
>
>              Hi,
>
>              I just replied on github
>
>         
> https://github.com/bastibl/gr-ieee802-11/issues/18#issuecomment-130651522
>
>              It would be great if you could try what I suggest there.
>
>              Best,
>              Bastian
>
>              On 08/13/2015 02:32 PM, Garver, Paul W wrote:
>
>                  Make sure logging is disabled on ALL blocks. I haven't
>         seen that
>                  libstdcxx error before, but I do have the segfaults
>         with the
>                  logging in
>                  Ubuntu 15.04 with pybombs install.
>
>                  Paul Garver
>
>
>                  On Aug 13, 2015, at 7:33 AM, Tian Alvin
>         <address@hidden <mailto:address@hidden>
>                  <mailto:address@hidden
>         <mailto:address@hidden>>
>                  <mailto:address@hidden
>         <mailto:address@hidden> <mailto:address@hidden
>         <mailto:address@hidden>>>>
>                  wrote:
>
>                      Hi Paul,
>
>                      Thanks very much for your help! I have disabled
>         logging and
>                      debug in
>                      OFDM Parse MAC block, but the error is still there.
>
>                      Did you also see the below error in your case when
>         (gdb) run
>                      wifi_loopback.py?
>                      <image.png>
>                      ImportError: No module named 'libstdcxx'
>
>
>                      Thanks
>
>
>                      On Wed, Aug 12, 2015 at 9:07 PM, Paul Garver
>                      <address@hidden <mailto:address@hidden>
>         <mailto:address@hidden <mailto:address@hidden>>
>                      <mailto:address@hidden
>         <mailto:address@hidden> <mailto:address@hidden
>         <mailto:address@hidden>>>> wrote:
>
>                           Tian,
>
>                           Disable logging and debug in the GRC
>         flowgraph.  See if
>                      this
>                           solves the problem. For reference, see [1].
>
>
>                           [1]
>         
> https://lists.gnu.org/archive/html/discuss-gnuradio/2015-07/msg00289.html
>
>                           On 08/12/2015 01:23 PM,
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>                                   1. error with running
>         wifi_loopback.grc from
>                          gr-ieee802-11
>                                      (Tian Alvin)
>
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>              --
>              Dipl.-Inform. Bastian Bloessl
>              Distributed Embedded Systems
>              University of Paderborn, Germany
>         http://www.ccs-labs.org/~bloessl/
>
>
>
>     --
>     Dipl.-Inform. Bastian Bloessl
>     Distributed Embedded Systems
>     University of Paderborn, Germany
>     http://www.ccs-labs.org/~bloessl/

--
Dipl.-Inform. Bastian Bloessl
Distributed Embedded Systems
University of Paderborn, Germany
http://www.ccs-labs.org/~bloessl/