enhancement-add examples of using pylibnidaqmx about pylibnidaqmx HOT 3 OPEN

Thanks! I have added a note to the main web page.

Hi,

Your scripts are really useful. I'm also trying to test pylibnidaqmx on windows 
xp with DAQmx 8.8. However I keep running into runtime errors (see below for an 
example). You say that:

"Also of note, I have a cython interface file to the raw DAQmx library which
works (at least on windows).  It's possible to use this together with
pylibnidaqmx."

How did you set this up?

Cheers for any help!

Rob Sewell

Traceback (most recent call last):
  File "C:\Documents and Settings\rsewell\Desktop\pylibnidaq examples\trunk\correlated_ao_dio.py", line 17, in <module>
    atask.write(adata, auto_start=False)
  File "C:\Python26\lib\site-packages\nidaqmx\libnidaqmx.py", line 2695, in write
    float64 (timeout), layout_val, data.ctypes.data, ctypes.byref(samples_written), None)
  File "C:\Python26\lib\site-packages\nidaqmx\libnidaqmx.py", line 187, in CALL
    r = CHK(r, funcname, *new_args)
  File "C:\Python26\lib\site-packages\nidaqmx\libnidaqmx.py", line 168, in CHK
    raise RuntimeError('%s%s:%s' % (funcname,args, text))
RuntimeError: DAQmxWriteAnalogF64(AnalogOutputTask('_unnamedTask<0>'), 
c_long(1000), c_ulong(0L), c_double(10.0), 1, 214652888, <cparam 'P' 
(0CC0ECD8)>, None):
  NI Platform Services:  The specified resource is reserved. The operation could
  not be completed as specified.
  ----------

@Rob Sewell
Your error looks like something that happens when your board either doesn't 
have a resource or the last task is still active in some way. You might want to 
try it again after reseting the board.

If you'd like to look at the cython implementation, I compile it on windows xp 
with the pythonxy distribution.  My bitbucket repo is 

https://[email protected]/cleemesser/cydaqmx

The main advantage I've seen with it is for more complicated acquisitions.  But 
I haven't needed to do those recently.  I haven't compiled it under linux.