seeed interface: fix fileno issue with windows

Gussy · Gussy · commit 77c1737715ff · 2020-08-30T23:27:51.000-07:00
diff --git a/can/interfaces/seeedstudio/seeedstudio.py b/can/interfaces/seeedstudio/seeedstudio.py
@@ -8,6 +8,7 @@
 
 import logging
 import struct
+import io
 from time import time
 from can import BusABC, Message
 
@@ -262,7 +263,7 @@ def _recv_internal(self, timeout):
         return None, None
 
     def fileno(self):
-        if hasattr(self.ser, "fileno"):
+        try:
             return self.ser.fileno()
-        # Return an invalid file descriptor on Windows
-        return -1
+        except io.UnsupportedOperation:
+            raise NotImplementedError("fileno is not implemented using current CAN bus")
