Running LV VI / program from python

[abaker]

Hi,

I have an automation SW written in python and I would like to get my LV measuring capabilities in to that

meaning calling the LV program and get the measured results back to my PY scripts

in LV i use the DAQMX to measure

if someone can help me with a small start programmer that would be helpful

using NI 6289 DAQ MX to measure differential voltage

thanks

Assaf

[User002]

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@abaker wrote:

Hi,

I have an automation SW written in python and I would like to get my LV measuring capabilities in to that

meaning calling the LV program and get the measured results back to my PY scripts

in LV i use the DAQMX to measure

if someone can help me with a small start programmer that would be helpful

using NI 6289 DAQ MX to measure differential voltage

thanks

Assaf

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Use sockets for example, then you can also communicate with your LV program across a TCP/IP/UDP network.

Python Sockets:

http://www.evolt.org/node/60276

LabVIEW sockets:

http://www.ni.com/white-paper/2710/en

Br,

/Roger

[SteveChandler]

You could build your LabVIEW VI into a DLL and easily call that from Python using ctypes.

Attached is a very simple project with two VIs - AddNumbers.vi and SubtractNumbers.vi. You need to create a build specification for a DLL that includes these.

• Right Click Build Specifications and select New/Shared Library (DLL)
• Change the Target filename to LabVIEWMath.dll (or you have to edit the Python file that I included)
• Change the Destination directory to the directory that contains the attached example project (not good practice but convenient here)
• Select Source Files
• Move AddNumbers.vi to the Exported VIs by highlighting them and clicking the blue arrow
• Keep the defaults on Define VI Prototype (make sure you have C Calling Conventions selected)
• Repeat the previous two steps for SubtractNumbers.vi
• Click Build

Now from a command prompt, change to the LabVIEW example project directory and run the attached script 'Call LabVIEW.py'