Custom python dll not working in FME

Hi david_r

Thanks for the fast reaction!

Adding the PYTHONHOME-variable did the trick! The Workspaces completes the task. At the end however, an error is thrown everytime the program runs.

Good to hear PYTHONHOME helped. That might indicate that your PATH points to another Python installation before the one in C:\\python27.

Regarding the error I see that there is a fatal Python error shown in the log window, but it is virtually impossible to tell where the problem lies without analysing/debugging the Python code in question. It might, however, be related to your PATH again and different versions of the MSVC libraries. Maybe try the steps outlined here and see if it helps.

The pythoncode that is used is just some 'dummy' code in order to test the matplotlib functionality (see below - just a creator and pythoncaller).

I tried reinstalling the Visual C++ Redistributial but that didn't fix the issue. 

I am unfortunately not allowed to update windows to the last version. Therefore I cannot test if that would do the trick. I tried the same code in FME 2015.0, 2015.1 and 2016 and they all result in the same error.

Thanks for the help!

import fme
import fmeobjects

import matplotlib.pyplot as plt

# Template Function interface:
def processFeature(feature):

    x = [1, 2, 3, 4, 5]
    y = [10, 15, 3, 18, 7]
    nbBins = 5

    plt.hist(x, weights=y)
    plt.savefig('D:/histogram.png') 

import fme
import fmeobjects

import matplotlib.pyplot as plt

# Template Function interface:
def processFeature(feature):

    x = [1, 2, 3, 4, 5]
    y = [10, 15, 3, 18, 7]
    nbBins = 5

    plt.hist(x, weights=y)
    plt.savefig('D:/histogram.png') 

Reinstalling MSVC won't help in 99% of cases. You'll probably have to progressively remove folders from your PATH environment variable until it starts working, and then you'll have found your culprit. Unfortunately, problems with different versions on the MSVC is well known and not limited to FME. Lots to be found on this issue with Google...

For your script, the only thing I can suggest is to add

plt.close() 

At the end of processFeatures. Let us know if it makes a difference.

It did!

Everything works smoothly now.

Thank you very much David!