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fix dll path issue with Twincat 4026 #393

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fix dll path issue with Twincat 4026 #393

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17 changes: 11 additions & 6 deletions pyads/pyads_ex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,21 +56,26 @@

# load dynamic ADS library
if platform_is_windows(): # pragma: no cover, skip Windows test
dlldir_handle = None
dlldir_handle = []
if sys.version_info >= (3, 8) and "TWINCAT3DIR" in os.environ:
# Starting with version 3.8, CPython does not consider the PATH environment
# variable any more when resolving DLL paths. The following works with the default
# installation of the Beckhoff TwinCAT ADS DLL.
dll_path = os.environ["TWINCAT3DIR"] + "\\..\\AdsApi\\TcAdsDll"
dll_path = os.environ["TWINCAT3DIR"]
# 20240620 update with the versoin 4026
dll_path_v4023 = os.path.join(dll_path, "\\..\\AdsApi\\TcAdsDll")
dll_path_v4026 = os.path.join(dll_path, "..")
if platform.architecture()[0] == "64bit":
dll_path += "\\x64"
dlldir_handle = os.add_dll_directory(dll_path)
dll_path_v4023 += "\\x64"
dll_path_v4026 += "\\Common64"
dlldir_handle.append(os.add_dll_directory(dll_path_v4023))
dlldir_handle.append(os.add_dll_directory(dll_path_v4026))
try:
_adsDLL = ctypes.WinDLL("TcAdsDll.dll") # type: ignore
finally:
if dlldir_handle:
for handle in dlldir_handle:
# Do not clobber the load path for other modules
dlldir_handle.close()
handle.close()
NOTEFUNC = ctypes.WINFUNCTYPE( # type: ignore
ctypes.c_void_p,
ctypes.POINTER(SAmsAddr),
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