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improved dll/so load function to use PATH env variable #66

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improved dll/so load function to use PATH env variable #66

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19 changes: 9 additions & 10 deletions hid/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,13 +1,12 @@
import os
import ctypes
import atexit
import enum
from ctypes.util import find_library

__all__ = ['HIDException', 'DeviceInfo', 'Device', 'enumerate', 'BusType']


hidapi = None
library_paths = (
libraries = (
'libhidapi-hidraw.so',
'libhidapi-hidraw.so.0',
'libhidapi-libusb.so',
Expand All @@ -18,18 +17,18 @@
'hidapi.dll',
'libhidapi-0.dll'
)

for lib in library_paths:
try:
hidapi = ctypes.cdll.LoadLibrary(lib)
for lib_path in [find_library(lib) for lib in libraries]:
if lib_path is not None:
break
except OSError:
pass
else:
error = "Unable to load any of the following libraries:{}"\
.format(' '.join(library_paths))
.format(' '.join(libraries))
raise ImportError(error)

try:
hidapi = ctypes.cdll.LoadLibrary(lib_path)
except Exception as err:
raise ImportError(err)

hidapi.hid_init()
atexit.register(hidapi.hid_exit)
Expand Down