How to use ZXing(decode qr code) .

ZXing for iOS is a sub-project of zxing project partially maintained by

independent developers. As of 26th of March 2011, it contains 3 iOS projects:

  - BarCodes:  Zxing iOS app. Available on app store.

  - ZXingWidget: a Library that can be included in any iOS app

  - ScanTest: a simple demo app for ZXingWidget





How to include ZXingWidget in a easy and clean way (in XCode4):

====================================================



  1. Locate the "ZXingWidget.xcodeproj" file under "`zxing/iphone/ZXingWidget/`".

Drag ZXingWidget.xcodeproj and drop it onto the root of your Xcode project's "Groups and Files"

sidebar.  A dialog will appear -- make sure "Copy items" is unchecked and "Reference Type" is "Relative to Project"

     before clicking "Add". Alternatively you can right-click on you project navigator and select 'Add files to "MyProject"' 



  2. Now you need to link the ZXingWidget static library to your project.  To do that,

      a. select you project file in the project navigator

      b. In the second column, select your _target_ and not the project itself 

      c. Go to the 'build phases' tab, expand the 'link binary with libraries' section,

d. Click the add button A dialog will appear and you should see libZXingWidget.a in the very first

possibilities



  3. Now you need to add ZXingWidget as a dependency of your project, so Xcode compiles it whenever

you compile your project.

    a. like in substep c. of previous step, you nedd to do that in the 'build phases' tab of your target

    b. Expand the 'Target Dependencies' section

    c. Click the add Button and a dialog will appear select ZXingWidget target



4. Headers search path 1: you need to tell your project where to find the ZXingWidget headers.

Select your project in the project navigator, and the select your target and go to the "Build Settings" tab.

Look for "Header Search Paths" and double-click it.

Add the relative path from your project's directory to the "zxing/iphone/ZXingWidget/Classes" directory. Make sure you click the checkbox "recursive path" !





  5. Headers search path 2: You need to add zxing cpp headers to your headers search path,

do this similarly as previous step to point the path to cpp/core/src/ where the 'zxing' directory is.

You don't need to make this search path recursive so do not check the "recursive path" option



6. Import the following iOS frameworks:

   a. AVFoundation

   b. AudioToolbox

   c. CoreVideo

   d. CoreMedia

   e. libiconv

   f. AddressBook

     g. AddressBookUI

   This must be done by adding them in the 'Link Libraries with Binary' just like step 2.c.



  7. You're almost ready to go ..



  8. #import <ZXingWidgetController.h> in a source file



  9. #import <QRCodeReader.h> for example because you will need to inject a barcode reader into ZXingWidgetController.



  10. MAKE SURE the file in which you are using the code deader is a .mm because you are now silently including some c++ code. If you don't do so then

     the compiler may cry as if it does not find some files !



  11. It should work





Known issues for above steps to include:

======================================

  - It can happen that when trying to build your own project with ZXingWidgetController you get linker errors like

    "undefined reference to". If this error looks like a c++ undefined reference, then renaming main.m into main.mm (Objective-C++ source suffix)

    may fix the problem



  - If you have building error like " ... : No such file or directory", then it is a classical error, it means that the path to includes is not well

    specified. The best way to fix this is to look at the Build Command that failed. To do that, click on the lower right corner of your Xcode project,

    you should see the build command that failed. Click on it and expand it by clicking on the "more" symbols that just appeared. This will make appear

    the exact command line instruction that is ran and fails. You can then make sure that the Header search path you specified is there, and you can also

    copy/paste this line into your terminal and try to see if you can reproduce/fix the error by adding the right path to the compiler. Once is is fixed,

    you should have an idea of what's the problem and accordingly modify your Header Search Path.



  - You could have issue of building AdHoc or release build in Xc4 with "No Packager exists for the type of archive" message - see http://stackoverflow.com/questions/5271496/xcode4-ios-4-3-no-packager-exists-for-the-type-of-archive/5322743#5322743







中文说明(针对XCode 4)

1  在"`zxing/iphone/ZXingWidget/`"目录找到"ZXingWidget.xcodeproj" 文件拖到你的项目中,并且不用选择"Copy items"这个选项.选择"Reference Type"为"Relative to Project",然后点击"Add"

2.点击项目中ZXingWidget.xcodeproj的左三角,出现两个文件,其中一个是"libZXingWidget.a",单击它然后在右边的详细查看框里把它的"targget"的选择勾上

3.在"Groups & Files"里有一个"Targets"的东东,点击左边的三角然后选择下面的第一个项目,右键选择"Get Info".在打开的框里选择"General" tab, 添加"Direct Dependencies",点击"+"然后选择"ZXingWidget"->"Add target",把对话框关掉

4.在"Groups&Files"里选择最最上面的一项,然后右键->"Get Info"->"Build" tab

搜索"Header search path",然后在双击它,添加两个完整路径

(1)你的本地路径+"zxing/iphone/ZXingWidget/Classes",记得选择"recursive path"

e.g.我的完整路径是"/Users/easyin/ZXing/iphone/ZXingWidget/Classes"

(2)你的本地路径+"cpp/core/src/",记得不要选择"recursive path"

e.g.我的完整路径是"/Users/easyin/ZXing/cpp/core/src/"



后面跟六步一样就可以了,这个贴子主要是给自己备忘,写得非常不好,路过的高手不要喷,因为我也看不到

以上英语内容为官方文档内容,中文为自己打,如有雷同,说明哥们两英雄所见略同