在Watir加载错误中不能使用browser.send_keys("{tab}")

Question

我无法使用Watir识别富TextBox。因此，我尝试使用browser.send_keys(“{tab}”)按选项卡。但这会产生一个错误。我试着卸载ffi-1.0.10-x86-mingw32.gem并安装ffi -v 1.0.9，但这不起作用。我遇到了这样的错误：

irb(main):013:0> browser.send_keys("{tab}")
LoadError: cannot load such file -- ffi_c
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.0.10-x86-mingw32/lib/ffi.rb:11:in `rescue in <top (required)>'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.0.10-x86-mingw32/lib/ffi.rb:2:in `<top (required)>'
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rautomation-0.7.2/lib/rautomation/adapter/win_32.rb:6:in `<top (required)>'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rautomation-0.7.2/lib/rautomation/window.rb:67:in `const_get'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rautomation-0.7.2/lib/rautomation/window.rb:67:in `initialize'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:456:in `new'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:456:in `rautomation'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:475:in `send_keys'
        from (irb):13
        from C:/Ruby193/bin/irb:12:in `<main>'
irb(main):014:0>

我使用Watir3.0.0，Ruby1.9.3。

宝石：

(1.1.0)

• builder (3.0.0)

• commonwatir (3.0.0)

• ffi (1.0.10 x86-mingw32)

• hoe (3.0.6)

• io-console (0.3)

• json (1.5.4)

• minitest (2.5.1)

• nokogiri ) (1.5.3 x86-mingw32)

• rake (0.9.2.2)

• rautomation (0.7.2)

• rdoc (3.9.4)

• rubygems-update (1.8.24)

• s4t-utils (1.0.4)

• user-choices (1.1.6.1)

• watir (3.0，1.5.3)

• watir-classic (3.0.0)

• win32-api (1.4.8)

• win32-process (0.6.5)

• windows-api (0.4.1)

• windows-pr (1.2.1)

• xml-simple (1.1.1)

Answer 1

尝试：

browser.send_keys :tab

我相信watir3.0改变了send_keys方法，使之类似于Watir-Webdriver -参见http://watirmelon.com/tag/send_keys/