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Ultimaker Cura 3.6 - PlugIn with .pyd


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Posted (edited) · Ultimaker Cura 3.6 - PlugIn with .pyd



I've been educating myself in Ultimaker Cura 3.6 by writing my own Plugin. At this point I've no problems and everything is working fine. I now decided to convert one file of my Plugin from .py to .pyd with Cython. Now Ultimaker does not even load this Plugin anymore, saying:

2019-04-05 14:46:01,337 - ERROR - [MainThread] UM.Logger.logException [88]:     from . import J_Do_It_2
2019-04-05 14:46:01,337 - ERROR - [MainThread] UM.Logger.logException [88]: ImportError: cannot import name 'J_Do_It_2'


Does Ultimaker Cura not support Plugins with precompiled/converted .pyd files?


The main file MPFWriter.py


import tempfile
import os
import io

from typing import cast
from . import J_Do_It_2

from UM.Application import Application
from UM.Logger import Logger
from UM.Mesh.MeshWriter import MeshWriter #The writer we need to implement.
from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType
from UM.PluginRegistry import PluginRegistry #To get the g-code writer.

class MPFWriter(MeshWriter):

    version = 3

    def __init__(self):

    def write(self, stream, nodes, mode = MeshWriter.OutputMode.TextMode):

        #Store the g-code from the scene.
        temp_gcode = tempfile.NamedTemporaryFile("w", delete=False)
        name = temp_gcode.name
        gcode_writer = cast(MeshWriter, PluginRegistry.getInstance().getPluginObject("GCodeWriter"))
        success = gcode_writer.write(temp_gcode, None)
        #converter = J_Do_It.DoIt()
        if not success: #Writing the g-code failed. 
            return False

        path = os.path.dirname(os.path.abspath(__file__))

            head = io.open((str(path) +"/HeadAndEnd/head.txt"), "r", encoding='utf8')
            end = io.open((str(path) + "/HeadAndEnd/end.txt"), "r", encoding='utf8')
        except EnvironmentError as e:
            if head:
                Logger.log("e", "Cannot open or find HeadFile")
            elif end:
                Logger.log("e", "Cannot open or find EndFile")
                Logger.log("Something went wrong")
            return False

            J_Do_It_2.DoIt.openFile(name, stream.name, head, end)
        except EnvironmentError as e:
            if temp_gcode:
                Logger.log("e", "Cannot create temp-File {pathTempFile}".format(temp_gcode=temp_gcode))
            return False


        return True


The calculator file J_Do_It_2.pyd (before it is converted into pyd and shortened):

import io

class DoIt():


    def openFile(self, pathSource, pathTarget, head, end):
        #do something

    def readLine(self, line):

        #do something

    def replaceVars(self, elements):
        #do something

    def calculate(self, value, containsXYZ):
        #do something


Edited by MadCooper
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    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd

    What do you want to achieve by converting the plugin to a pyd file?


    All plugins are distributed as .py files. You may be able to get it to work with .pyc files instead if you want to obfuscate your code.

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    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd
    On ‎4‎/‎5‎/‎2019 at 8:02 PM, ahoeben said:

    What do you want to achieve by converting the plugin to a pyd file?

    A Professor (An engineer) asked me, if Plugins can use .DLL files. Searching for how to use .dll-files in python, I found this hole .pyd thing. So, I just wanted to try it. 


    And yes, i am working on Windows. 

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    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd

    @MadCooper There seems to be something missing in your code for your pyd file. Cura (actually the embedded Python interpreter) should be able to pick it up normally. I've embedded PyWin32 into my CAD plugins and it comes with many pyd files and works fine.

    You probably want to take a look into SWIG or Cython to be able to code with fewer hassles and let one of these projects generate the C/C++ code you need.


    Maybe this is something for you! 🙂 

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