Add null terminator when printing barcode of type A, issue #58

escpos/escpos.py

@@ -440,6 +440,9 @@ class Escpos(object):
         else:
             raise BarcodeCodeError()
 
+        if function_type.upper() == "A":
+            self._raw("\x00")
+
     def text(self, txt):
         """ Print alpha-numeric text