No examples for U12? about labjackpython HOT 3 CLOSED

when I call aiStreamStart(1, [0], 200) as a method of my d object, I get this incomprehensible (to me) error:

AttributeError Traceback (most recent call last)
in ()
----> 1 d.aiStreamStart(1, [0], 200)

...
//anaconda/envs/ATMOcanes/lib/python3.6/ctypes/init.py in getitem(self, name_or_ordinal)
364
365 def getitem(self, name_or_ordinal):
--> 366 func = self._FuncPtr((name_or_ordinal, self))
367 if not isinstance(name_or_ordinal, int):
368 func.name = name_or_ordinal

AttributeError: dlsym(0x7fc937eca220, AIStreamStart): symbol not found

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I recommend using the eAnalogIn method instead. Execution time is around 20 ms, it is easier to use, and will fit your few samples per second requirement. Example code is in the source docstring, which can also be displayed with the Python help method:

import u12
help(u12.U12.eAnalogIn)

Regarding the U12 stream functions, they are for sampling at faster rates such as 200 to 1200 samples per second. AI stands for analog input. The aiStreamStart example code in the docstring doesn't look clear enough. It should be something like:

import u12
dev = u12.U12()
dev.aiStreamStart(1, [0], 200)

u12 is the module and U12 is the class. Alternatively it could of had a "from u12 import U12" before the calls for them to be correct.

Regardng asterisks, our general documentation is based on the C/C++ header file. In C/C++, an asterisk indicates the parameter is a pointer (array or pass by reference).

"symbol not found" indicates a function from a library can't be found. On Linux and Mac, the u12 module only uses the Exodriver which does not have the AIStreamStart function. Currently that function is only available on Windows where the u12 module uses the ljackuw (UW) library. Let me know if you need the stream functions for Linux or Mac OS X and I can look into it further.

from labjackpython.

from labjackpython.