Hi there,
I’m trying to make our add-on work when its enabled from blender
starting up (safe as enabled in user prefs). But for some reason this doesn’t
work. It works fine when enabled after blender has started.
The add-on is comprised of a package with sub-packages. The parent package at
the upper most level has its __init__ file simply import and call register on
the sub packages as required by the environment. We have binaries in our
package and so the sub-packages contain different builds for different
operating systems.
The issue is that the top level __init__ file imports the sub package it needs
when it is registered (not when its imported), it then calls the imported
packages register method (see package structure and code below).
The problem comes when the package is being loaded at run time, its seems that
the package is first imported and then register is run, then unregister is run.
This causes an issue since the cr_platform object doesn’t seem to exist when
the package is unregistered during the enabling of the add-on at load time of
blender.
I wasn’t really expecting the enable process for an add-on to first load then
unload and then load the add-on again. I really need to understand this whole
process better to be able to either work around the issue or maybe redesign the
package if its not compatible? I thought that what I had built didn’t violate
anything in the python blender api as far as I can tell.
Help would be most appreciated!!
James
Package structure
top_level of package
__init__.py
Darwin
__init__.py
bl_2_78
lib
bl_2_79
lib
Linux
__init__.py
bl_2_78
lib
bl_2_79
lib
Wind64
__init__.py
bl_2_78
lib
bl_2_79
lib
### contents of __init__.py at the top level
import bpy, imp, subprocess, sys, os
def select_platform():
""" checks python/blender versions and sets import paths accordingly
"""
global cr_platform
if sys.platform.startswith('darwin'):
from . import Darwin as cr_platform
elif sys.platform.startswith('linux'):
from . import Linux as cr_platform
elif sys.platform.startswith('win'):
from . import Win64 as cr_platform
else:
raise RuntimeError(" unsupported version of python, you have :" +\
python_version +" supported versions are 3.5.2 and 3.5.3")
def register():
select_platform()
cr_platform.register()
def unregister():
if 'cr_platform' in locals():
cr_platform.unregister()
else:
raise RuntimeError("could not find the cr_platform while
unregistering!")
if __name__ == '__main__':
register()
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