#24724: GeoDjango with Django 1.8 - 'GDALAllRegister' Attribute Error
------------------------------+--------------------------------------------
Reporter: dimitri- | Owner: nobody
justeau |
Type: Bug | Status: new
Component: GIS | Version: 1.8
Severity: Release | Keywords: geodjango gdal windows rasters
blocker |
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
------------------------------+--------------------------------------------
I used to work with geodjango using Django 1.7 on Windows 7, and
everything was working well. After having upgraded to django 1.8, loading
the gis app causes an error.
Here is the full Traceback:
{{{
Traceback (most recent call last):
File "C:\Users\justeau\PycharmProjects\Digitizing-
Monitor\digitizing_monitor\manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "C:\Python34\lib\site-packages\django\core\management\__init__.py",
line 338, in execute_from_command_line
utility.execute()
File "C:\Python34\lib\site-packages\django\core\management\__init__.py",
line 312, in execute
django.setup()
File "C:\Python34\lib\site-packages\django\__init__.py", line 18, in
setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Python34\lib\site-packages\django\apps\registry.py", line 108,
in populate
app_config.import_models(all_models)
File "C:\Python34\lib\site-packages\django\apps\config.py", line 198, in
import_models
self.models_module = import_module(models_module_name)
File "C:\Python34\lib\importlib\__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in
_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in
_call_with_frames_removed
File "C:\Python34\lib\site-packages\django\contrib\auth\models.py", line
41, in <module>
class Permission(models.Model):
File "C:\Python34\lib\site-packages\django\db\models\base.py", line 139,
in __new__
new_class.add_to_class('_meta', Options(meta, **kwargs))
File "C:\Python34\lib\site-packages\django\db\models\base.py", line 324,
in add_to_class
value.contribute_to_class(cls, name)
File "C:\Python34\lib\site-packages\django\db\models\options.py", line
250, in contribute_to_class
self.db_table = truncate_name(self.db_table,
connection.ops.max_name_length())
File "C:\Python34\lib\site-packages\django\db\__init__.py", line 36, in
__getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "C:\Python34\lib\site-packages\django\db\utils.py", line 240, in
__getitem__
backend = load_backend(db['ENGINE'])
File "C:\Python34\lib\site-packages\django\db\utils.py", line 111, in
load_backend
return import_module('%s.base' % backend_name)
File "C:\Python34\lib\importlib\__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in
_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in
_call_with_frames_removed
File "C:\Python34\lib\site-
packages\django\contrib\gis\db\backends\postgis\base.py", line 8, in
<module>
from .features import DatabaseFeatures
File "C:\Python34\lib\site-
packages\django\contrib\gis\db\backends\postgis\features.py", line 1, in
<module>
from django.contrib.gis.db.backends.base.features import
BaseSpatialFeatures
File "C:\Python34\lib\site-
packages\django\contrib\gis\db\backends\base\features.py", line 3, in
<module>
from django.contrib.gis.db.models import aggregates
File "C:\Python34\lib\site-
packages\django\contrib\gis\db\models\__init__.py", line 7, in <module>
from django.contrib.gis.geos import HAS_GEOS
File "C:\Python34\lib\site-
packages\django\contrib\gis\geos\__init__.py", line 16, in <module>
from .geometry import GEOSGeometry, wkt_regex, hex_regex
File "C:\Python34\lib\site-
packages\django\contrib\gis\geos\geometry.py", line 10, in <module>
from django.contrib.gis.gdal.error import SRSException
File "C:\Python34\lib\site-
packages\django\contrib\gis\gdal\__init__.py", line 47, in <module>
from django.contrib.gis.gdal.driver import Driver # NOQA
File "C:\Python34\lib\site-packages\django\contrib\gis\gdal\driver.py",
line 5, in <module>
from django.contrib.gis.gdal.prototypes import ds as vcapi, raster as
rcapi
File "C:\Python34\lib\site-
packages\django\contrib\gis\gdal\prototypes\raster.py", line 25, in
<module>
register_all = void_output(lgdal.GDALAllRegister, [])
File "C:\Python34\lib\ctypes\__init__.py", line 364, in __getattr__
func = self.__getitem__(name)
File "C:\Python34\lib\ctypes\__init__.py", line 369, in __getitem__
func = self._FuncPtr((name_or_ordinal, self))
AttributeError: function 'GDALAllRegister' not found
}}}
After some searches, it appears that other people had this problem when
using GeoDjango + Django 1.8 + Windows (example:
https://gis.stackexchange.com/questions/143110/geodjango-setup-python-
gdalallregister-attribute-error/144407#144407). But I could not find any
fix for this.
I investigated a bit, and found out that at
django.contrib.gis.gdal.libgal, we can see this:
{{{
..|
47| # This loads the GDAL/OGR C library
48| lgdal = CDLL(lib_path)
49|
50| # On Windows, the GDAL binaries have some OSR routines exported
with
51| # STDCALL, while others are not. Thus, the library will also
need to
52| # be loaded up as WinDLL for said OSR functions that require the
53| # different calling convention.
54| if os.name == 'nt':
55| from ctypes import WinDLL
56| lwingdal = WinDLL(lib_path)
..|
}}}
So when the os is Windows, the GDAL library is also loaded as a DLL, so we
have two GDAL libraries, lgdal and lwingdal.
But if we look at the django.contrib.gis.gdal.prototypes.raster (where the
"'GDALAllRegister' not found" error is raised from), we can see that the
one used is lgdal:
{{{
..|
29| # Raster Driver Routines
30| register_all = void_output(lgdal.GDALAllRegister, [])
31| get_driver = voidptr_output(lgdal.GDALGetDriver, [c_int])
32| get_driver_by_name = voidptr_output(lgdal.GDALGetDriverByName,
[c_char_p], errcheck=False)
33| get_driver_count = int_output(lgdal.GDALGetDriverCount, [])
34| get_driver_description =
const_string_output(lgdal.GDALGetDescription, [c_void_p])
..|
}}}
It seems like on Windows, lwingdal should be used, so I added this after
the imports:
{{{
..|
15| # Fix for windows users
16| if os.name == 'nt':
17| from django.contrib.gis.gdal.libgdal import lwingdal
18| lgdal = lwingdal
..|
}}}
And it solved the problem for me! Maybe there is something more, it seems
a bit too easy, but I still had no issue with it, and I now can use the
GIS with Django 1.8 on Windows, which was impossible before this.
Hope I helped...
Regards,
Dimitri.
--
Ticket URL: <https://code.djangoproject.com/ticket/24724>
Django <https://code.djangoproject.com/>
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