一、zbar官方介绍
ZBar 是款桌面电脑用条形码/二维码扫描工具，支持摄像头及图片扫描，支持多平台，例如 iPhone，Andriod 手机，同时 ZBar封装了二维码扫描的 API 开发包。
ZBar 目前条码类型有：EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Interleaved 2 of 5 and QR Code.
从上可以看出，zbar有挺多优势，封装了API，支持多平台，支持多种条码类型，包括一维、二维码。
具体主页：http://zbar.sourceforge.net/
二、zbar的python安装
进入https://pypi.python.org/pypi/zbar，可以看到最新版本是0.10，提供源码以及python2.5、python2.6下的exe版本。
| File | Type | Py Version | Uploaded on | Size | |
|---|---|---|---|---|---|
| zbar-0.10.tar.bz2 (md5, pgp) | Source | 2009-11-10 | 15KB | ||
| zbar-0.10.tar.gz (md5, pgp) | Source | 2009-11-10 | 18KB | ||
| zbar-0.10.win32-py2.5.exe (md5, pgp) | MS Windows installer | 2.5 | 2009-11-10 | 74KB | |
| zbar-0.10.win32-py2.6.exe (md5, pgp) | MS Windows installer | 2.6 | 2009-11-10 | 205KB | |
| zbar-0.10.zip (md5, pgp) | Source | 2009-11-10 | 31K | ||
结论：没有whl，没有python2.7的exe安装，更不奢望64位版本之类。
1、pypi网址，找whl或者exe安装包
百度找到非官方发布的python2.7下zbar安装文件，https://github.com/jacobvalenta/zbar-py27-msi/blob/master/zbar-0.10.win32-py2.7_2.msi。
实测可用，这里为了说明pypi的编译过程，不使用该方案。
2、pypi源码安装
2.1、配置mingw编译环境
windows系统安装并配置mingw编译器，是另一个大坑，爬坑的过程不细说，简要描述如下：
1、下载mingw 5.1.6 ，地址如下：http://d1.rsdown.cn/soft1/mingw5.1.6.zip
2、解压后，双击其中的mingw.exe进行安装，选择常用的安装包，例如gcc等。
3、配置mingw安装路径，参看：http://blog.csdn.net/wangrouyi/article/details/7454687（注意，这个说明中的mingw是按照在d:\mingw下，如果你是安装在c盘，则要改成c:\mingw。）
右击我的电脑，点属性->高级->环境变量。然后：
1)、在PATH里加入D:\MinGW\bin，记得，如果里面还有其他的变量，记得要加个分号啊，分号得在英文输入模式下输入的。
2)、新建LIBRARY_PATH变量，如果有的话，在值中加入D:\MinGW\lib，这是标准库的位置。
3)、新建C_INCLUDEDE_PATH变量，值设为D\MinGW\include。
4)、新建CPLUS_INCLUDE_PATH变量，值为D\MinGW\include\c++\3.4.5;D:\MinGW\include\c++\3.4.5;D:\MinGW\include\c++\3.4.5\backward;D:\MinGW\include。
4、python中配置mingw编译器。
在C:\Python27\Lib\distutils下新建或者修改distutils.cfg文件，内容如下：
[build] compiler=mingw32
2.2、pip安装(pip install zbar)，下面开始逐项排雷。
1、pip install zbar，果然出现c语言编译错误，没有找到zbar.h头文件（下图中蓝色字体部分）C:\Users\zou>pip install zbar
Collecting zbar
Downloading http://mirrors.aliyun.com/pypi/packages/33/54/cc5819efc9ee7e34b60b41e1d2d4753b6dd0c26a41c9a552611f66aa106e/zbar-0.10.tar.bz2
Installing collected packages: zbar
Running setup.py install for zbar ... error
Complete output from command c:\python27\python.exe -u -c "import setuptools, tokenize;__file__=‘c:\\users\\joshua~1\\appdata\\local\\temp\\pip-build-pnikpa\\zbar\\setup.py‘;f=getattr(tokenize, ‘open‘, open)(__file__);code=f.read().replace(‘\r\n‘, ‘\n‘);f.close();exec(compile(code, __file__, ‘exec‘))" install --record c:\users\joshua~1\appdata\local\temp\pip-2chu03-record\install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
building ‘zbar‘ extension
creating build
creating build\temp.win32-2.7
creating build\temp.win32-2.7\Release
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -Ic:\python27\include -Ic:\python27\PC -c zbarmodule.c -o build\temp.win32-2.7\Release\zbarmodule.o
In file included from zbarmodule.c:24:
zbarmodule.h:26:18: zbar.h: No such file or directory
In file included from zbarmodule.c:24:
zbarmodule.h:37: error: `ZBAR_ERR_NUM‘ undeclared here (not in a function)
zbarmodule.h:67: error: syntax error before "zbar_image_t"
zbarmodule.h:67: warning: no semicolon at end of struct or union
zbarmodule.h:69: error: syntax error before ‘}‘ token
zbarmodule.h:69: warning: type defaults to `int‘ in declaration of `zbarImage‘
zbarmodule.h:69: warning: data definition has no type or storage class
2、找zbar.h
到zbar的github目录， https://github.com/ZBar/ZBar ，下载zbar整体源码，解压后统一放到d:\src下，找到 d:\src\include\zbar.h ，同时找到d:\src\python\setup.py（python下的setup文件）
3、修改setup.py文件，增加 include_dirs行，指向include目录。
ext_modules = [
Extension(‘zbar‘, [
‘zbarmodule.c‘,
‘enum.c‘,
‘exception.c‘,
‘symbol.c‘,
‘symbolset.c‘,
‘symboliter.c‘,
‘image.c‘,
‘processor.c‘,
‘imagescanner.c‘,
‘decoder.c‘,
‘scanner.c‘,
],
libraries = [ ‘zbar‘ ],
include_dirs = [ ‘..\include‘ ],(自己的路径）
),
D:\src\python>python setup.py install
running install
running build
running build_ext
building ‘zbar‘ extension
creating build
creating build\temp.win32-2.7
creating build\temp.win32-2.7\Release
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c zbarmodule.c -o build\temp.win32-2.7\Release\zbarmodule.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c enum.c -o build\temp.win32-2.7\Release\enum.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c exception.c -o build\temp.win32-2.7\Release\exception.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c symbol.c -o build\temp.win32-2.7\Release\symbol.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c symbolset.c -o build\temp.win32-2.7\Release\symbolset.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c symboliter.c -o build\temp.win32-2.7\Release\symboliter.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c image.c -o build\temp.win32-2.7\Release\image.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c processor.c -o build\temp.win32-2.7\Release\processor.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c imagescanner.c -o build\temp.win32-2.7\Release\imagescanner.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c decoder.c -o build\temp.win32-2.7\Release\decoder.o
c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -Ic:\python27\include -Ic:\python27\PC -c scanner.c -o build\temp.win32-2.7\Release\scanner.o
writing build\temp.win32-2.7\Release\zbar.def
creating build\lib.win32-2.7
c:\mingw\bin\gcc.exe -mno-cygwin -shared -s build\temp.win32-2.7\Release\zbarmodule.o build\temp.win32-2.7\Release\enum.o build\temp.win32-2.7\Release\exception.o build\temp.win32-2.7\Release\symbol.o build\temp.win32-2.7\Release\symbolset.o build\temp.win32-2.7\Release\symboliter.o build\temp.win32-2.7\Release\image.o build\temp.win32-2.7\Release\processor.o build\temp.win32-2.7\Release\imagescanner.o build\temp.win32-2.7\Release\decoder.o build\temp.win32-2.7\Release\scanner.o build\temp.win32-2.7\Release\zbar.def -Lc:\python27\libs -Lc:\python27\PCbuild -Lc:\python27\PC\VS9.0 -lzbar -lpython27 -lmsvcr90 -o build\lib.win32-2.7\zbar.pyd
c:\mingw\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\mingw32\bin\ld.exe: cannot find -lzbar
collect2: ld returned 1 exit status
error: command ‘c:\\mingw\\bin\\gcc.exe‘ failed with exit status 1
继续报错，不能zbar的lib库。
5、进入https://github.com/ZBar/ZBar/tree/master/python 目录，查看python下的说明，发现如下文字：
To install this module type the following:: python setup.py install Dependencies ------------ This module requires the ZBar Bar Code Reader, which may be obtained from: * http://zbar.sourceforge.net/ Windows users please note: the module *will NOT load* unless the ZBar library DLL (currently libzbar-0.dll) is available in your Windows system PATH!
简单翻译一下：
a、python zbar安装方法：python setup.py install
b、python zbar需要zbar reader，zbar reader可以从http://zbar.sourceforge.net/网址下载到。
c、windows平台，需要zbar dll，最新版本名字为libzbar-0.dll 。
6、进入http://zbar.sourceforge.net/download.html，下载windows下的zbar reader执行程序。
Windows Installer Note that the Windows port is in an unstable, testing phase. If you do try it out, please let us know how well it‘s working for you and open a support request if you encounter any problems. The Windows Installation Guide has detailed instructions for installing and getting started with ZBar on Windows.
ZBar 0.10 Windows installer The Windows installer now includes pre-built binaries of the dependencies (ImageMagick et al). Copyright, license, and source code details for these libraries may be found in the README included with the distribution. Windows binaries for the Python module are available from PyPI
具体网址：https://jaist.dl.sourceforge.net/project/zbar/zbar/0.10/zbar-0.10-setup.exe ，下载后安装zbar reader执行程序
7、安装zbar reader，默认路径 C:\Program Files (x86)\ZBar ，在bin目录下，果然找到libzbar-0.dll动态链接库文件。
8、拷贝libzbar-9.dll 到c:\python27\LIBS目录下
9、修改setup.py文件，指向zbar-0
ext_modules = [
Extension(‘zbar‘, [
‘zbarmodule.c‘,
‘enum.c‘,
‘exception.c‘,
‘symbol.c‘,
‘symbolset.c‘,
‘symboliter.c‘,
‘image.c‘,
‘processor.c‘,
‘imagescanner.c‘,
‘decoder.c‘,
‘scanner.c‘,
],
libraries = [ ‘zbar-0‘ ],
include_dirs = [ ‘..\include‘ ],
),
10、再次执行 python setup.py install
C:\src\python>python setup.py install running install running build running build_ext building ‘zbar‘ extension creating build creating build\temp.win32-2.7 creating build\temp.win32-2.7\Release C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c zbarmodule.c -o build\temp.win32-2.7\Release\zbarmodule.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c enum.c -o build\temp.win32-2.7\Release\enum.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c exception.c -o build\temp.win32-2.7\Release\exception.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c symbol.c -o build\temp.win32-2.7\Release\symbol.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c symbolset.c -o build\temp.win32-2.7\Release\symbolset.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c symboliter.c -o build\temp.win32-2.7\Release\symboliter.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c image.c -o build\temp.win32-2.7\Release\image.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c processor.c -o build\temp.win32-2.7\Release\processor.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c imagescanner.c -o build\temp.win32-2.7\Release\imagescanner.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c decoder.c -o build\temp.win32-2.7\Release\decoder.o C:\mingw/bin\gcc.exe -mno-cygwin -mdll -O -Wall -I..\include -IC:\Python27\include -IC:\Python27\PC -c scanner.c -o build\temp.win32-2.7\Release\scanner.o writing build\temp.win32-2.7\Release\zbar.def creating build\lib.win32-2.7 C:\mingw/bin\gcc.exe -mno-cygwin -shared -s build\temp.win32-2.7\Release\zbarmodule.o build\temp.win32-2.7\Release\enum.o build\temp.win32-2.7\Release\exception.o
build\temp.win32-2.7\Release\symbol.o build\temp.win32-2.7\Release\symbolset.o build\temp.win32-2.7\Release\symboliter.o build\temp.win32-2.7\Release\image.o
build\temp.win32-2.7\Release\processor.o build\temp.win32-2.7\Release\imagescanner.o build\temp.win32-2.7\Release\decoder.o build\temp.win32-2.7\Release\scanner.o
build\temp.win32-2.7\Release\zbar.def -LC:\Python27\libs -LC:\Python27\PCbuild -LC:\Python27\PC\VS9.0 -lzbar-0 -lpython27 -lmsvcr90 -o build\lib.win32-2.7\zbar.pyd running install_lib copying build\lib.win32-2.7\zbar.pyd -> C:\Python27\Lib\site-packages running install_egg_info Writing C:\Python27\Lib\site-packages\zbar-0.10-py2.7.egg-info
至此，编译并安装成功。
注意，上文中蓝色字体部分，Lib目录默认找了python27\libs目录，所以前文第8步拷贝到libs的奥秘正在于此。