app/django/contrib/gis/gdal/libgdal.py
author Lennard de Rijk <ljvderijk@gmail.com>
Mon, 16 Feb 2009 20:38:35 +0000
changeset 1364 b2709805fafe
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Update org bulk accept script. The script now: 1) leaves correctly control to the browser to update the GUI of the progress bar during ajax communication. 2) Displays an error if something went wrong (I've tried in my box stopping the server while doing the requests), and show a retry button to fetch again the list of the applications that are still not accepted and iterate over them again (seems to recover correctly restarting the server after the error in my box) 3) doesn't display any text at the beginning, and the button has the correct CSS class assigned 4) Check if there are applications to accept, if not displays a message stating that there are no orgs to accept. Patch by: Mario Ferraro Reviewed by: Lennard de Rijk

import os, sys
from ctypes import c_char_p, CDLL
from ctypes.util import find_library
from django.contrib.gis.gdal.error import OGRException

# Custom library path set?
try:
    from django.conf import settings
    lib_path = settings.GDAL_LIBRARY_PATH
except (AttributeError, EnvironmentError, ImportError):
    lib_path = None

if lib_path:
    lib_names = None
elif os.name == 'nt':
    # Windows NT shared library
    lib_names = ['gdal15']
elif os.name == 'posix':
    # *NIX library names.
    lib_names = ['gdal', 'gdal1.5.0']
else:
    raise OGRException('Unsupported OS "%s"' % os.name)

# Using the ctypes `find_library` utility  to find the 
# path to the GDAL library from the list of library names.
if lib_names:
    for lib_name in lib_names:
        lib_path = find_library(lib_name)
        if not lib_path is None: break
        
if lib_path is None:
    raise OGRException('Could not find the GDAL library (tried "%s"). '
                       'Try setting GDAL_LIBRARY_PATH in your settings.' % 
                       '", "'.join(lib_names))

# This loads the GDAL/OGR C library
lgdal = CDLL(lib_path)

# On Windows, the GDAL binaries have some OSR routines exported with 
# STDCALL, while others are not.  Thus, the library will also need to 
# be loaded up as WinDLL for said OSR functions that require the 
# different calling convention.
if os.name == 'nt':
    from ctypes import WinDLL
    lwingdal = WinDLL(lib_path)

def std_call(func):
    """
    Returns the correct STDCALL function for certain OSR routines on Win32
    platforms.
    """
    if os.name == 'nt':
        return lwingdal[func]
    else:
        return lgdal[func]

#### Version-information functions. ####

# Returns GDAL library version information with the given key.
_version_info = std_call('GDALVersionInfo')
_version_info.argtypes = [c_char_p]
_version_info.restype = c_char_p

def gdal_version():
    "Returns only the GDAL version number information."
    return _version_info('RELEASE_NAME')

def gdal_full_version(): 
    "Returns the full GDAL version information."
    return _version_info('')

def gdal_release_date(date=False): 
    """
    Returns the release date in a string format, e.g, "2007/06/27".
    If the date keyword argument is set to True, a Python datetime object
    will be returned instead.
    """
    from datetime import date as date_type
    rel = _version_info('RELEASE_DATE')
    yy, mm, dd = map(int, (rel[0:4], rel[4:6], rel[6:8]))
    d = date_type(yy, mm, dd)
    if date: return d
    else: return d.strftime('%Y/%m/%d')