From 604b6b0fbd8bf924b869630409ac26ba1e64ad58 Mon Sep 17 00:00:00 2001
From: tempdban <temp@dban.tk>
Date: Sun, 31 Jul 2016 00:36:33 +0800
Subject: [PATCH] =?UTF-8?q?=E8=89=B2=E5=9D=97=E5=8F=8D=E8=89=B2?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

我的控制台背景是白的...
---
 README.md       | 6 ++++++
 README.rst      | 6 ++++++
 README_EN.md    | 6 ++++++
 itchat/tools.py | 7 ++++---
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 2d51304a..68fb062b 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,12 @@ itchat.auto_login(enableCmdQR = True)
 itchat.auto_login(enableCmdQR = 2)
 ```
 
+默认控制台背景色为暗色（黑色），若背景色为浅色（白色），可以将enableCmdQR赋值为负值：
+
+```python
+itchat.auto_login(enableCmdQR = -1)
+```
+
 ### 退出程序后暂存登陆状态
 
 通过如下命令登陆，即使程序关闭，一定时间内重新开启也可以不用重新扫码。
diff --git a/README.rst b/README.rst
index 35feea3a..65d643ad 100644
--- a/README.rst
+++ b/README.rst
@@ -71,6 +71,12 @@ Because of width of some character differs from systems, you may adjust the enab
     # for some linux system, width of block character is one instead of two, so enableCmdQR should be 2
     itchat.auto_login(enableCmdQR = 2)
 
+Default background color of command line is dark (black), if it's not, you may set enableCmdQR to be negative:
+
+.. code:: python
+
+    itchat.auto_login(enableCmdQR = -1)
+
 *Hot reload*
 
 By using the following command, you may reload the program without re-scan QRCode in some time.
diff --git a/README_EN.md b/README_EN.md
index edc8ba87..64b6306f 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -68,6 +68,12 @@ Because of width of some character differs from systems, you may adjust the enab
 itchat.auto_login(enableCmdQR = 2)
 ```
 
+Default background color of command line is dark (black), if it's not, you may set enableCmdQR to be negative:
+
+```python
+itchat.auto_login(enableCmdQR = -1)
+```
+
 ### Hot reload
 
 By using the following command, you may reload the program without re-scan QRCode in some time.
diff --git a/itchat/tools.py b/itchat/tools.py
index 55ebffb4..e8c64e74 100644
--- a/itchat/tools.py
+++ b/itchat/tools.py
@@ -63,7 +63,7 @@ def print_qr(fileDir):
     else:
         os.startfile(fileDir)
 try:
-    from PIL import Image 
+    from PIL import Image
     def print_cmd_qr(fileDir, size = 37, padding = 3,
             white = BLOCK, black = '  ', enableCmdQR = True):
         img     = Image.open(fileDir)
@@ -71,11 +71,12 @@ def print_cmd_qr(fileDir, size = 37, padding = 3,
         rgb     = img.convert('RGB')
         try:
             blockCount = int(enableCmdQR)
-            assert(0 < blockCount)
+            assert(0 < abs(blockCount))
         except:
             blockCount = 1
         finally:
-            white *= blockCount
+            white *= abs(blockCount)
+            if blockCount < 0: white, black = black, white
         sys.stdout.write(' '*50 + '\r')
         sys.stdout.flush()
         qr = white * (size + 2) + '\n'