Better error reporting when a resource cannot be found.

See #129
pyvisa · Mar 31, 2015 · 33aa8f3 · 33aa8f3
1 parent 8555fc1
commit 33aa8f3
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/pyvisa/ctwrapper/functions.py b/pyvisa/ctwrapper/functions.py
@@ -1367,6 +1367,9 @@ def parse_resource_extended(library, session, resource_name):
                                 unaliased_expanded_resource_name,
                                 alias_if_exists)
 
+    if ret != constants.VI_SUCCESS:
+        return None, ret
+
     res = [buffer_to_text(val)
            for val in (resource_class,
                        unaliased_expanded_resource_name,

diff --git a/pyvisa/highlevel.py b/pyvisa/highlevel.py
@@ -1585,7 +1585,7 @@ def resource_info(self, resource_name):
         ret, err = self.visalib.parse_resource_extended(self.session, resource_name)
         if err == constants.StatusCode.success:
             return ret
-        raise ValueError('Could not parse resource: %s' % resource_name)
+        raise ValueError('Could not parse resource: %s (error code %s)' % (resource_name, ret))
 
     def open_bare_resource(self, resource_name,
                           access_mode=constants.AccessModes.no_lock,