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IDProjectCategoryView StatusLast Update
0000671Draftpublic2012-04-19 21:44
Reportergalou_breizh Assigned Toyorik  
Status closedResolutionfixed 
Summary0000671: Crash with "Draft"/"Put... on sheet" with PartDesignExample.FCStd
Description- Open FreeCAD
- On the Start Page, select "Load a PartDesign example"
- Open the Draft Workbench
- Select Pocket002
- Click on the icon "Puts the selected... sheet", note that no drawing sheet was
- Crash!

FreeCAD 0.13, Libs: 0.13R0840 (Git)
Additional InformationIn the console:
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
FreeCAD: /home/galou/builds/free-cad/src/Base/BaseClass.cpp:115: virtual PyObject* Base::BaseClass::getPyObject(): Assertion `0' failed.
Abnormal program termination...
TagsNo tags attached.
FreeCAD Information


child of 0000672 closed FreeCAD Loading Example "Drawing extraction" crashes at Baseclass.cpp line 115 



2012-04-13 19:30

administrator   ~0001941

Last edited: 2012-04-13 19:30

Yes I was trying to debug that problem too...

Werner, can you have a look a this? Here is a simple way to reproduce. It doesn't involve the Draft module, so I'm not too sure what to do:

1) save a file in the macro dir with this code:

import FreeCAD,FreeCADGui

class testView:
    def __init__(self, obj):
        obj.Proxy = self

    def execute(self, obj):
        print "execute"
    def onChanged(self, obj, prop):
        print "updating prop ",prop

def make():
    page = FreeCAD.ActiveDocument.addObject("Drawing::FeaturePage","Page")
    template = FreeCAD.getResourceDir()+'Mod/Drawing/Templates/A3_Landscape.svg'
    page.Template = template
    view = FreeCAD.ActiveDocument.addObject("Drawing::FeatureViewPython","View")

2) open freecad, create an object, and select that object
3) import;test.make()
4) save the file, close freecad
5) reopen the file

--> crash with this message:

updating prop Proxy
updating prop Rotation
updating prop Scale
updating prop ViewResult
updating prop X
updating prop Y
freecad: /home/yorik/Apps/Sources/FreeCAD/src/Base/BaseClass.cpp:115: virtual PyObject* Base::BaseClass::getPyObject(): Assertion `0' failed.

Anything wrong in the code above?


2012-04-13 19:32

administrator   ~0001942

Reminder sent to: wmayer

Werner, can you have a look at this one? Thanks!


2012-04-16 13:17

administrator   ~0001947

Note, using "FreeCADGui.ActiveDocument.ActiveView" isn't very reliable (any more) if you want to access the 3D view of the active document.

Now, also the SVG view can be the active view and there are other kind of views than can be the active like the split view, ...

But all commands in draft are tailored to expect that the active view is always an instance of the C++ class View3DInventor. I think it should be explicitly requested a view of that type and not assuming the "ActiveView" is automatically the right one.
Therefore I have added the method/function get3DView() into DraftTools and DraftTrackers to at least fix this issue. I think it might be best to replace all occurrences of 'FreeCADGui.ActiveDocument.ActiveView' with a call of get3DView().

Btw, maybe you can implement a property called 'ActiveView' when used inside classes:

class Tracker;
    def get3DView(self):
    ActiveView = property(get3DView)

The crash happened because DrawingView::getPyObject() wasn't implemented before.
This was fixed with 0000672.

And finally the messages:
FeaturePython::onChanged (ViewPocket002): 'NoneType' object has no attribute 'PropertiesList'
are a different issue.


2012-04-16 14:25

administrator   ~0001949

Ah great! Considering the svg view as an active view will allow for many interesting things, and it's logical, after all. Indeed that requires reconsidering a few things in the Draft module, where it is assumed that there is always a current 3D view. I'll propagate your changes everywhere in the Draft and Arch modules. Thanks for the fix!

I didn't know about that python property function... I'll look into it.

About the 'NoneType' object has no attribute 'PropertiesList', it comes recurrently when using Drawing::FeatureView objects, but since it doesn't create any problem, I didn't look much into it yet.


2012-04-16 20:57

administrator   ~0001950

okay should be all working again normally now. I'll leave this open a bit more in case I forgot something.

The property() system looks VERY useful... Now I'm wanting to use it everywhere! For now I gathered all the functionality to get the 3D view inside the module, so it's accessible easily to all functions.

Thanks again for your help Werner, I dind't understand well what was happening.


2012-04-19 21:44

administrator   ~0001956

We can now close this i think.

Issue History

Date Modified Username Field Change
2012-04-13 18:22 galou_breizh New Issue
2012-04-13 19:30 yorik Note Added: 0001941
2012-04-13 19:30 yorik Note Edited: 0001941
2012-04-13 19:32 yorik Note Added: 0001942
2012-04-14 13:30 yorik Relationship added child of 0000672
2012-04-16 13:17 wmayer Note Added: 0001947
2012-04-16 14:25 yorik Note Added: 0001949
2012-04-16 20:57 yorik Note Added: 0001950
2012-04-16 21:06 yorik Status new => assigned
2012-04-16 21:06 yorik Assigned To => yorik
2012-04-19 21:44 yorik Note Added: 0001956
2012-04-19 21:44 yorik Status assigned => closed
2012-04-19 21:44 yorik Resolution open => fixed