[Discuss-gnuradio] GnuRadio Port: The system cannot find the file specified

[Ryan van den Bergh]

Hi,

I installed the Gnuradio Port using the Windows Binary from Josh Blum's 
website yesterday. I followed all the instructions, installed the latest 
version, and also used the dependencies files provided. Everything 
worked perfectly until I tried to run a simulation in the GNU Radio 
Companion. When I clicked generate and then execute, I get the following 
messages:

Generating: "C:\Program Files (x86)\gnuradio\bin\top_block.py"

Executing: "C:\Program Files (x86)\gnuradio\bin\top_block.py"
[Error 2] The system cannot find the file specified
>>> Done

At this point it does nothing. I've tried saving the files to another 
location (in case Windows is preventing the program from accessing that 
directory), and I'm running the program via a Windows Shell with 
Administrator rights - nothing I do makes a difference. The only other 
strange error that I can locate, is in the Windows Shell just after I 
enter the command to run the GNU Radio Companion:

D:\Python27\lib\site-packages\cheetah-2.4.4-py2.7.egg\Cheetah\Compiler.py:1509: 
UserWarning:
You don't have the C version of NameMapper installed! I'm disabling 
Cheetah's useStackFrames option as it is painfully slow with the Python 
version of NameMapper. You should get a copy of Cheetah with the 
compiled C version of NameMapper.
"\nYou don't have the C version of NameMapper installed! "

Now I installed Cheetah using easy_install, and the GNU Radio Companion 
does start, so I'm not sure whether that error is relevant or not.

In addition, whilst looking through past emails pertaining to the 
GnuRadio Port, I stumbled across the emails between Mark Colin and Josh 
Blum, wherein Josh asked him to check whether the Gnuradio and UHD 
packages were missing. I figured it couldn't hurt to try and run the 
commands Josh recommended, so I tried them both. I received no errors 
when trying to load gnuradio, i.e. python.exe -c "from gnuradio import 
gr", but when I tried to load the uhd, I got the following errors:

C:\Windows\system32>python.exe -c "from gnuradio import uhd"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "c:\program files 
(x86)\gnuradio\lib\site-packages\gnuradio\uhd\__init__.
py", line 87, in <module>
    _prepare_uhd_swig()
  File "c:\program files 
(x86)\gnuradio\lib\site-packages\gnuradio\uhd\__init__.
py", line 26, in _prepare_uhd_swig
    import uhd_swig
  File "c:\program files 
(x86)\gnuradio\lib\site-packages\gnuradio\uhd\uhd_swig.
py", line 24, in <module>
    _uhd_swig = swig_import_helper()
  File "c:\program files 
(x86)\gnuradio\lib\site-packages\gnuradio\uhd\uhd_swig.
py", line 20, in swig_import_helper
    _mod = imp.load_module('_uhd_swig', fp, pathname, description)
ImportError: DLL load failed: The specified module could not be found.

Again I don't know what any of this means, or if it has any bearing on 
my inability to run GNU Radio Companion simulations, but I thought I 
should add it to this email for completeness.

I'd really appreciate any help anyone can provide. Unfortunately I have 
to develop an application using GnuRadio in Windows (several of my 
application's dependencies are windows specific), otherwise I'd switch 
to Linux in a heartbeat, but I am very grateful to Josh for porting the 
GnuRadio project to windows.

Lastly, in case someone has a better solution, I need to develop a very 
lightweight "SDR API", which will enable a Java application (as I said 
above, it has to run in Windows as some of the other dependencies are 
Windows specific) to asynchronously transmit and receive packets using 
two USRP2s. I am planning on developing this "API" using the GnuRadio 
Companion, and then just running the python script using Java's 
interface to the Windows Shell, but if anyone knows of a way to 
drastically reduce the complexity of my current solution, I'd really 
appreciate it!

Kind regards,

Ryan