John-Breedloves-Mac-mini:~ john_breedlove$ irb
>> require 'jruby'
=> true
>> require 'zxing'
RuntimeError: ZXing requires JRuby
from /Library/Ruby/Gems/1.8/gems/zxing-0.1.1/lib/zxing.rb:1
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:36:in `require'
from (irb):2
>>
这怎么可能?
此外,我如何在ruby脚本中编写它? 我有一个我想要执行的文件名为test.rb,其中包含以下内容:
require 'rubygems'
require 'jruby'
require 'zxing'
ZXing.decode 'test.png'
我正在从命令行执行它,如下所示:
ruby test.rb
在这种情况下,我如何包含java?或者这甚至可能吗?
答案 0 :(得分:1)
您使用的是JRuby gem,而不是JRuby本身。
JRuby
(ZXing在第1行检查)是一个仅在JRuby中require 'java'
之后定义的模块。
这应该在ZXing的文档中明确说明,但似乎不是。
以下是从克隆的ZXing源代码运行以下内容时的测试输出:
$ ruby -v -I lib -r zxing -e 'p 0'
ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
./lib/zxing.rb:1: ZXing requires JRuby (RuntimeError)
$ jruby -I lib -r zxing -e 'p 0'
/Users/asari/Development/src/zxing.rb/lib/zxing.rb:1: ZXing requires JRuby (RuntimeError)
from /Users/asari/Development/src/zxing.rb/lib/zxing.rb:1
...internal jruby stack elided...
from (unknown).(unknown)(/Users/asari/Development/src/zxing.rb/lib/zxing.rb:1)
from (unknown).(unknown)(:1)
$ jruby -r java -I lib -r zxing -e 'p 0'
0