ImportError: No module named _uhd_swig

[alireza nazari]

Hi,

I am using GNURadio from PothosSDR on Windows. When I run my grc file in gnuradio, it runs correctly. However when I run it in command prompt I get this error:

E:\Alireza\sdr_A20\4channel\recorder>recorder_grc.py
Traceback (most recent call last):
  File "E:\Alireza\sdr_A20\4channel\recorder\recorder_grc.py", line 12, in <module>
    from gnuradio import uhd
  File "E:\Program Files\PothosSDR\lib\python2.7\site-packages\gnuradio\uhd\__init__.py", line 135, in <module>
    _prepare_uhd_swig()
  File "E:\Program Files\PothosSDR\lib\python2.7\site-packages\gnuradio\uhd\__init__.py", line 38, in _prepare_uhd_swig
    import uhd_swig
  File "E:\Program Files\PothosSDR\lib\python2.7\site-packages\gnuradio\uhd\uhd_swig.py", line 17, in <module>
    _uhd_swig = swig_import_helper()
  File "E:\Program Files\PothosSDR\lib\python2.7\site-packages\gnuradio\uhd\uhd_swig.py", line 16, in swig_import_helper
    return importlib.import_module('_uhd_swig')
  File "E:\Python27\lib\importlib\__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named _uhd_swig

Anybody knows what can be wrong? I thought it's a path issue but it looks like my PYTHONPATH is pointing to "E:\Program Files\PothosSDR\lib\python2.7\site-packages" which looks correct. 

[alireza nazari]

I also realized "import uhd" doesn't find the module. I assume gnuradio in PothosSDR is using uhd python APIs, otherwise gnu companion couldn't run my grc file. But I don't know where python APIs are to add them to the path. I hope this solves the problem. 

[Josh Blum]

Sometimes the python imports fail when the actual underlying DLL cannot be loaded.

So its possible that uhd.dll cannot be found in $PATH or perhaps a DLL needed by uhd.dll cannot be found

Double check that E:\Program Files\PothosSDR\bin is in your $PATH

You can also open uhd.dll or _uhd_swig.dll in a program called dependency walker, it can show you which dlls cannot be found.

Hope that helps,

-josh

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