Developing plugin - issue with i18nc

[vitalbir 0]

I'm developing a new plugin for Cura 4.5

 

But even not using the i18n in the code, like this:

from UM.i18n import i18nCatalog
catalog = i18nCatalog("cura")

 

 

I received this error when I put my plugin code folder on C:\Users\xxxxx\AppData\Roaming\cura\4.5\plugins and try to start the Cura 4.5:

2020-04-30 11:38:17,592 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [66]: An uncaught error has occurred!
2020-04-30 11:38:17,599 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: Traceback (most recent call last):
2020-04-30 11:38:17,605 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 1023, in event
2020-04-30 11:38:17,614 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\UM\Qt\QtApplication.py", line 456, in event
2020-04-30 11:38:17,622 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\UM\Event.py", line 189, in call
2020-04-30 11:38:17,633 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\cura\Settings\MachineManager.py", line 157, in setInitialActiveMachine
2020-04-30 11:38:17,640 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\cura\Settings\MachineManager.py", line 312, in setActiveMachine
2020-04-30 11:38:17,663 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]:   File "X:\4.5-exe\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 645, in setGlobalContainerStack
2020-04-30 11:38:17,686 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: AttributeError: 'NoneType' object has no attribute 'i18nc'

 

 

[ahoeben 2,016]

Can you show more of your code? It seems you are trying to access the global container stack before Cura is ready for you to access it.

[vitalbir 0]

On 4/30/2020 at 12:28 PM, ahoeben said:

Can you show more of your code? It seems you are trying to access the global container stack before Cura is ready for you to access it.

Yes, sure

 

from PyQt5.QtWidgets import QFileDialog, QMessageBox

import os.path
import sys

from UM.Extension import Extension
from UM.Application import Application
from UM.Logger import Logger
from UM.Message import Message

from UM.i18n import i18nCatalog
catalog = i18nCatalog("cura")

class SettingsPDFReportPlugin(Extension):
    
    def __init__(self):
        super().__init__()
        Logger.log("d", "Initializing the Settings PDF Report Plugin.")

        self._application = Application.getInstance()
        self._machine_manager = self._application.getMachineManager()
        self._global_stack = self._machine_manager.activeMachine
        

 

[ahoeben 2,016]

You are indeed trying to access the global container stack before Cura is ready for you to access it. Don't try to retreive the global stack from the machine manager in your __init__ method, because your plugin gets initialised before the global stack is created. The best way to get the global stack is to connect a method to the globalContainerStackChanged signal of the CuraApplication instance:

 

    def __init__(self) -> None:    
        ...
        self._application.globalContainerStackChanged.connect(self._onGlobalStackChanged)
        ...

    def _onGlobalStackChanged(self) -> None:
        self._global_stack = ...

 

Edited May 11, 2020 by ahoeben

[vitalbir 0]

20 minutes ago, ahoeben said:

You are indeed trying to access the global container stack before Cura is ready for you to access it. Don't try to retreive the global stack from the machine manager in your __init__ method, because your plugin gets initialised before the global stack is created. The best way to get the global stack is to connect a method to the globalContainerStackChanged signal of the CuraApplication instance:

 

    def __init__(self) -> None:    
        ...
        self._application.globalContainerStackChanged.connect(self._onGlobalStackChanged)
        ...

    def _onGlobalStackChanged(self) -> None:
        self._global_stack = ...

 

 

thanks!

where can i find this information? isn't that in the documentation? just analyzing the code of the cure to understand this?

[ahoeben 2,016]

8 minutes ago, vitalbir said:

just analyzing the code of the cure to understand this?

yes.

 

By the way, looking at the name of your plugin, I think you want your plugin to respond to a menu item in the Extension menu, and then export the settings, right? In that case, there's not much use in listing to every time the global stack is changed, but just get the global stack when that menu item is selected.

 

See https://github.com/Ultimaker/UraniumExampleExtensionPlugin/blob/master/ExampleExtension.py

You would get the global stack when you need it, ie in the sayHello method in that example.

 

Tip: if you say what you want to achieve instead just what is currently bugging you, I can give you better help.

Edited May 11, 2020 by ahoeben