84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
import os, sys
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from ctypes import c_char_p, CDLL
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from ctypes.util import find_library
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from django.contrib.gis.gdal.error import OGRException
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# Custom library path set?
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try:
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from django.conf import settings
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lib_path = settings.GDAL_LIBRARY_PATH
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except (AttributeError, EnvironmentError, ImportError):
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lib_path = None
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if lib_path:
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lib_names = None
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elif os.name == 'nt':
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# Windows NT shared library
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lib_names = ['gdal15']
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elif os.name == 'posix':
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# *NIX library names.
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lib_names = ['gdal', 'gdal1.5.0']
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else:
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raise OGRException('Unsupported OS "%s"' % os.name)
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# Using the ctypes `find_library` utility to find the
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# path to the GDAL library from the list of library names.
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if lib_names:
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for lib_name in lib_names:
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lib_path = find_library(lib_name)
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if not lib_path is None: break
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if lib_path is None:
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raise OGRException('Could not find the GDAL library (tried "%s"). '
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'Try setting GDAL_LIBRARY_PATH in your settings.' %
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'", "'.join(lib_names))
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# This loads the GDAL/OGR C library
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lgdal = CDLL(lib_path)
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# On Windows, the GDAL binaries have some OSR routines exported with
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# STDCALL, while others are not. Thus, the library will also need to
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# be loaded up as WinDLL for said OSR functions that require the
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# different calling convention.
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if os.name == 'nt':
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from ctypes import WinDLL
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lwingdal = WinDLL(lib_name)
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def std_call(func):
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"""
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Returns the correct STDCALL function for certain OSR routines on Win32
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platforms.
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"""
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if os.name == 'nt':
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return lwingdal[func]
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else:
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return lgdal[func]
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#### Version-information functions. ####
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# Returns GDAL library version information with the given key.
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_version_info = std_call('GDALVersionInfo')
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_version_info.argtypes = [c_char_p]
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_version_info.restype = c_char_p
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def gdal_version():
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"Returns only the GDAL version number information."
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return _version_info('RELEASE_NAME')
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def gdal_full_version():
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"Returns the full GDAL version information."
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return _version_info('')
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def gdal_release_date(date=False):
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"""
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Returns the release date in a string format, e.g, "2007/06/27".
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If the date keyword argument is set to True, a Python datetime object
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will be returned instead.
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"""
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from datetime import date as date_type
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rel = _version_info('RELEASE_DATE')
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yy, mm, dd = map(int, (rel[0:4], rel[4:6], rel[6:8]))
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d = date_type(yy, mm, dd)
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if date: return d
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else: return d.strftime('%Y/%m/%d')
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