Try to dlsym() the required functions only if the canlib has been loaded

Author: cowo78

can/interfaces/kvaser/canlib.py

@@ -319,6 +319,17 @@ def __check_bus_handle_validity(handle, function, arguments):
         errcheck=__check_status_operation,
     )
 
+    kvFlashLeds = __get_canlib_function("kvFlashLeds",
+                                        argtypes=[c_canHandle, ctypes.c_int,
+                                                  ctypes.c_int],
+                                        restype=ctypes.c_short,
+                                        errcheck=__check_status)
+
+    if sys.platform == "win32":
+        canGetVersionEx = __get_canlib_function("canGetVersionEx",
+                                                argtypes=[ctypes.c_uint],
+                                                restype=ctypes.c_uint,
+                                                errcheck=__check_status)
 
 def init_kvaser_library():
     if __canlib is not None:
@@ -330,6 +341,16 @@ def init_kvaser_library():
             log.warning("Kvaser canlib could not be initialized.")
 
 
+def init_kvaser_library():
+    if __canlib is not None:
+        try:
+            log.debug("Initializing Kvaser CAN library")
+            canInitializeLibrary()
+            log.debug("CAN library initialized")
+        except:
+            log.warning("Kvaser canlib could not be initialized.")
+
+
 DRIVER_MODE_SILENT = False
 DRIVER_MODE_NORMAL = True