Fix buffers with ctypes properly

asn1_value_editor/Scenario.py

@@ -185,19 +185,23 @@ class PollerThread(QThread):
             print 'Failed to open message queue ' + self.q_name
             return -1
         buffer_size = GetMsgQueueBufferSize(msg_q)
+        # Configure a buffer to read data from the queue
+        buff = ctypes.create_string_buffer(buffer_size)
         while True:
             if self.stop_requested:
                 return 0
-            p_data_from_mq = ctypes.create_string_buffer(buffer_size).raw
+            # Create an actual buffer and get the pointer
+            # (accessing .raw is doing Python magic)
+            raw = buff.raw
             msg_received_type = RetrieveMessageFromQueue(msg_q,
                                                          buffer_size,
-                                                         p_data_from_mq)
+                                                         raw)
             if msg_received_type == -1:
                 time.sleep(0.01)
                 continue
             else:
                 for slot in self.slots:
-                    slot.put((msg_received_type, p_data_from_mq))
+                    slot.put((msg_received_type, raw))
 
     def stop(self):
         ''' Request the poller to stop '''