Windows : Add DLL paths to resolve Python module dependencies

bin/__gaffer.py

@@ -43,6 +43,7 @@
 import sys
 import signal
 import warnings
+import pathlib
 
 # Get rid of the annoying signal handler which turns Ctrl-C into a KeyboardInterrupt exception
 signal.signal( signal.SIGINT, signal.SIG_DFL )
@@ -51,6 +52,14 @@
 # to catch all the naughty deprecated things we do.
 warnings.simplefilter( "default", DeprecationWarning )
 
+# Make sure we can can find DLLs that are linked into Python modules on Windows.
+if hasattr( os, "add_dll_directory" ) :
+	os.add_dll_directory( ( pathlib.Path( os.environ["GAFFER_ROOT"] ) / "lib" ).resolve() )
+	for extensionPath in os.environ.get( "GAFFER_EXTENSION_PATHS", "").split( os.pathsep ) :
+		for dllPath in [ pathlib.Path( extensionPath ) / d for d in [ "bin", "lib" ] ] :
+			if dllPath.is_dir() :
+				os.add_dll_directory( dllPath.resolve() )
+
 import IECore
 
 # Increase the soft limit for file handles as high as we can - we need everything we can get for

python/IECoreArnold/__init__.py

@@ -34,6 +34,14 @@
 #
 ##########################################################################
 
+import os
+import pathlib
+
+if hasattr( os, "add_dll_directory" ) :
+	os.add_dll_directory( ( pathlib.Path( os.environ["ARNOLD_ROOT"] ) / "bin" ).resolve() )
+
+del os, pathlib # Don't pollute the namespace
+
 from ._IECoreArnold import *
 
 from .UniverseBlock import UniverseBlock