Add _linked_libpython_windows

Author: tkf

julia/find_libpython.py

@@ -33,15 +33,13 @@ def linked_libpython():
     """
     Find the linked libpython using dladdr (in *nix).
 
-    Calling this in Windows always return `None` at the moment.
-
     Returns
     -------
     path : str or None
         A path to linked libpython.  Return `None` if statically linked.
     """
     if is_windows:
-        return None
+        return _linked_libpython_windows()
     return _linked_libpython_unix()
 
 
@@ -71,6 +69,26 @@ def _linked_libpython_unix():
     return path
 
 
+def _linked_libpython_windows():
+    """
+    Based on: https://stackoverflow.com/a/16659821
+    """
+    from ctypes.wintypes import HANDLE, LPWSTR, DWORD
+
+    GetModuleFileName = ctypes.windll.kernel32.GetModuleFileNameW
+    GetModuleFileName.argtypes = [HANDLE, LPWSTR, DWORD]
+    GetModuleFileName.restype = DWORD
+
+    MAX_PATH = 260
+    try:
+        buf = ctypes.create_unicode_buffer(MAX_PATH)
+        GetModuleFileName(ctypes.pythonapi._handle, buf, MAX_PATH)
+        return buf.value
+    except (ValueError, OSError):
+        return None
+
+
+
 def library_name(name, suffix=SHLIB_SUFFIX, is_windows=is_windows):
     """
     Convert a file basename `name` to a library name (no "lib" and ".so" etc.)

test/test_find_libpython.py

@@ -1,7 +1,3 @@
-import platform
-
-import pytest
-
 from julia.find_libpython import finding_libpython, linked_libpython
 from julia.core import determine_if_statically_linked
 
@@ -18,8 +14,6 @@ def test_finding_libpython_yield_type():
 # let's just check returned type of finding_libpython.
 
 
-@pytest.mark.xfail(platform.system() == "Windows",
-                   reason="linked_libpython is not implemented for Windows")
 def test_linked_libpython():
-    if determine_if_statically_linked():
+    if not determine_if_statically_linked():
         assert linked_libpython() is not None