From d59d44447c9de56b0471c1fcc967e48c39f5cb85 Mon Sep 17 00:00:00 2001
From: Patrick Kanzler <dev@pkanzler.de>
Date: Mon, 14 May 2018 23:34:31 +0200
Subject: [PATCH] add os.devnull for platform independence

fixes #288
---
 src/escpos/escpos.py | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index c14e44a..22755ab 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -24,6 +24,8 @@ from re import match as re_match
 import barcode
 from barcode.writer import ImageWriter
 
+import os
+
 from .constants import ESC, GS, NUL, QR_ECLEVEL_L, QR_ECLEVEL_M, QR_ECLEVEL_H, QR_ECLEVEL_Q
 from .constants import QR_MODEL_1, QR_MODEL_2, QR_MICRO, BARCODE_TYPES, BARCODE_HEIGHT, BARCODE_WIDTH
 from .constants import BARCODE_FONT_A, BARCODE_FONT_B, BARCODE_FORMATS
@@ -487,11 +489,12 @@ class Escpos(object):
         barcode_class = barcode.get_barcode_class(barcode_type)
         my_code = barcode_class(data, writer=image_writer)
 
-        my_code.write("/dev/null", {
-            'module_height': module_height,
-            'module_width': module_width,
-            'text_distance': text_distance
-        })
+        with open(os.devnull, "w") as nullfile:
+            my_code.write(nullfile, {
+                'module_height': module_height,
+                'module_width': module_width,
+                'text_distance': text_distance
+            })
 
         # Retrieve the Pillow image and print it
         image = my_code.writer._image