Update handling of Windows DLLs in Python wrapper (#175)

* Update ci.yml

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update mdi.py

* Update CMakeLists.txt

* Update mdi_global.h

.github/workflows/ci.yml

@@ -297,9 +297,9 @@ jobs:
       - uses: actions/checkout@v2
 
       # Set the Python version
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v5
         with:
-          python-version: '3.6'
+          python-version: '3.12'
 
       - name: Install dependencies
         run: |

CMakeLists.txt

@@ -73,7 +73,7 @@ else()
 endif()
 
 project(mdi
-        VERSION 1.4.35
+        VERSION 1.4.36
         LANGUAGES ${use_C} ${use_CXX} ${use_Fortran})
 
 # Check for MPI

MDI_Library/mdi.py

@@ -35,6 +35,16 @@
     mdi = ctypes.CDLL(mdi_path, ctypes.RTLD_GLOBAL)
     MDI_COMMAND_LENGTH = ctypes.c_int.in_dll(mdi, "MDI_COMMAND_LENGTH").value
 except (ValueError, AttributeError, OSError) as e:
+
+    # Add the path to the library to the PATH variable
+    os.path.dirname(mdi_path)
+    os.environ["PATH"] += ";" + str(mdi_path)
+
+    # On Windows, every DLL directory must be added through "add_dll_directory", or Python will refuse to open them
+    for p in os.environ["PATH"].split( ';' ):
+        if os.path.isdir( p ):
+            os.add_dll_directory( p )
+
     mdi = ctypes.WinDLL(mdi_path, ctypes.RTLD_GLOBAL)
     MDI_COMMAND_LENGTH = ctypes.c_int.in_dll(mdi, "MDI_COMMAND_LENGTH").value
 

MDI_Library/mdi_global.h

@@ -32,7 +32,7 @@
 // MDI version numbers
 #define MDI_MAJOR_VERSION_ 1
 #define MDI_MINOR_VERSION_ 4
-#define MDI_PATCH_VERSION_ 35
+#define MDI_PATCH_VERSION_ 36
 
 // length of an MDI command in characters
 #define MDI_COMMAND_LENGTH_ 256