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# Magic utility that "redirects" to pywintypesxx.dll
import importlib.machinery
import importlib.util
import os
import sys
def __import_pywin32_system_module__(modname, globs):
# This has been through a number of iterations. The problem: how to
# locate pywintypesXX.dll when it may be in a number of places, and how
# to avoid ever loading it twice. This problem is compounded by the
# fact that the "right" way to do this requires win32api, but this
# itself requires pywintypesXX.
# And the killer problem is that someone may have done 'import win32api'
# before this code is called. In that case Windows will have already
# loaded pywintypesXX as part of loading win32api - but by the time
# we get here, we may locate a different one. This appears to work, but
# then starts raising bizarre TypeErrors complaining that something
# is not a pywintypes type when it clearly is!
# So in what we hope is the last major iteration of this, we now
# rely on a _win32sysloader module, implemented in C but not relying
# on pywintypesXX.dll. It then can check if the DLL we are looking for
# lib is already loaded.
# See if this is a debug build.
suffix = "_d" if "_d.pyd" in importlib.machinery.EXTENSION_SUFFIXES else ""
filename = "%s%d%d%s.dll" % (
modname,
sys.version_info[0],
sys.version_info[1],
suffix,
)
if hasattr(sys, "frozen"):
# If we are running from a frozen program (py2exe, McMillan, freeze)
# then we try and load the DLL from our sys.path
# XXX - This path may also benefit from _win32sysloader? However,
# MarkH has never seen the DLL load problem with py2exe programs...
for look in sys.path:
# If the sys.path entry is a (presumably) .zip file, use the
# directory
if os.path.isfile(look):
look = os.path.dirname(look)
found = os.path.join(look, filename)
if os.path.isfile(found):
break
else:
raise ImportError(
"Module '%s' isn't in frozen sys.path %s" % (modname, sys.path)
)
else:
# First see if it already in our process - if so, we must use that.
import _win32sysloader
found = _win32sysloader.GetModuleFilename(filename)
if found is None:
# We ask Windows to load it next. This is in an attempt to
# get the exact same module loaded should pywintypes be imported
# first (which is how we are here) or if, eg, win32api was imported
# first thereby implicitly loading the DLL.
# Sadly though, it doesn't quite work - if pywintypesxx.dll
# is in system32 *and* the executable's directory, on XP SP2, an
# import of win32api will cause Windows to load pywintypes
# from system32, where LoadLibrary for that name will
# load the one in the exe's dir.
# That shouldn't really matter though, so long as we only ever
# get one loaded.
found = _win32sysloader.LoadModule(filename)
if found is None:
# Windows can't find it - which although isn't relevent here,
# means that we *must* be the first win32 import, as an attempt
# to import win32api etc would fail when Windows attempts to
# locate the DLL.
# This is most likely to happen for "non-admin" installs, where
# we can't put the files anywhere else on the global path.
# If there is a version in our Python directory, use that
if os.path.isfile(os.path.join(sys.prefix, filename)):
found = os.path.join(sys.prefix, filename)
if found is None:
# Not in the Python directory? Maybe we were installed via
# easy_install...
if os.path.isfile(os.path.join(os.path.dirname(__file__), filename)):
found = os.path.join(os.path.dirname(__file__), filename)
# There are 2 site-packages directories - one "global" and one "user".
# We could be in either, or both (but with different versions!). Factors include
# virtualenvs, post-install script being run or not, `setup.py install` flags, etc.
# In a worst-case, it means, say 'python -c "import win32api"'
# will not work but 'python -c "import pywintypes, win32api"' will,
# but it's better than nothing.
# We use the same logic as pywin32_bootstrap to find potential location for the dll
# Simply import pywin32_system32 and look in the paths in pywin32_system32.__path__
if found is None:
import pywin32_system32
for path in pywin32_system32.__path__:
maybe = os.path.join(path, filename)
if os.path.isfile(maybe):
found = maybe
break
if found is None:
# give up in disgust.
raise ImportError("No system module '%s' (%s)" % (modname, filename))
# After importing the module, sys.modules is updated to the DLL we just
# loaded - which isn't what we want. So we update sys.modules to refer to
# this module, and update our globals from it.
old_mod = sys.modules[modname]
# Load the DLL.
loader = importlib.machinery.ExtensionFileLoader(modname, found)
spec = importlib.machinery.ModuleSpec(name=modname, loader=loader, origin=found)
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
# Check the sys.modules[] behaviour we describe above is true...
assert sys.modules[modname] is mod
# as above - re-reset to the *old* module object then update globs.
sys.modules[modname] = old_mod
globs.update(mod.__dict__)
__import_pywin32_system_module__("pywintypes", globals())