当Internet Explorer 8上的JavaScript发生异常时,我需要获得完整的调用堆栈.函数调用可能发生在数量很大的帧之间.
调用堆栈以将日志发送给开发人员.我不能使用调试器,因为最终用户不必处理这个问题.
JavaScripts的当前解决方案提供了它可以生成callstack(http://eriwen.com/javascript/js-stack-trace/).它基于arguments.callee.caller.但是如果从当前帧外部调用函数,则调用者返回零(未定义).因此获得的callstack是不完整的.
在这种情况下,我可以获取从中调用函数的框架的名称吗?
基于活动脚本技术的解决方案提供了ScriptEngine类型的对象:IHTMLDocument :: get_Script(IDispatch**p)
但是将对象"script"转换为IActiveScript接口失败.
*我可以从IE8中获取用于给定上下文ScriptEngine的链接,以提取构建callstack所需的信息吗?
javascript internet-explorer exception-handling javascript-engine
我一直遇到MySQL服务器安装问题,在停电后搞砸了.
Intel i5 Mac运行OS X 10.6.5
Ruby 1.9.2安装
Rails 3.0.1安装
MySQL Server(最后)安装并运行
我完全重新安装了MySQL,后者删除了本地开发/测试/生产数据库.所以,我已经create database development;在MySQL中运行以使dev数据库为迁移做好准备.
rake db:migrate以重新获取我的数据库.(我目前无法从Rails访问我的数据库或Mysql.)使用gem 'mysql', '2.8.1'并运行rake db:migrate,我收到错误:
rake aborted!
undefined method 'init' for Mysql:Class
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堆栈跟踪:
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb:30:in 'mysql_connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in 'new_connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:238:in 'checkout_new_connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:194:in 'block (2 levels) in checkout'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in 'loop'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in 'block in checkout'
/Users/sscirrus/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/monitor.rb:201:in 'mon_synchronize'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:189:in 'checkout'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in 'connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:318:in 'retrieve_connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in 'retrieve_connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in 'connection'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:486:in 'initialize'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in 'new'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in 'up'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:415:in 'migrate'
/Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/railties/databases.rake:142:in 'block (2 …Run Code Online (Sandbox Code Playgroud) 到目前为止,我目前的HABTM实现工作:has_and_belongs_to_many.通知和隐私都继承自Preference.偏好是STI.我想尝试使用:has_many,:通过关联代替.
模型文件
class User < ActiveRecord::Base
has_and_belongs_to_many :preferences
end
class Preference < ActiveRecord::Base
has_and_belongs_to_many :users
end
class Notification < Preference
end
class Privacy < Preference
end
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迁移文件
class UsersHaveAndBelongToManyPreferences < ActiveRecord::Migration
def self.up
create_table :preferences_users, :id => false do |t|
t.references :preference, :user
t.timestamps
end
end
def self.down
drop_table :preferences_users
end
end
class CreatePreferences < ActiveRecord::Migration
def self.up
create_table :preferences do |t|
t.string :title
t.text :description
t.string :type
t.timestamps
end
end
def self.down
drop_table :preferences
end
end
class DeviseCreateUsers < …Run Code Online (Sandbox Code Playgroud) 我想写一个sql查询,并希望从DEPT表中获取没有在EMP表中分配员工的dept名称.
表结构:
EMP
EMPNO ENAME DEPTNO
DEPT
DEPTNO DNAME
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所以我想知道那些没有员工协会的DEPT.
if如果满足某个条件,如何退出块?
我尝试使用break但它不起作用:
if($bla):
$bla = get_bla();
if(empty($bla)) break;
do($bla);
endif;
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它说:致命错误:无法打破/继续1级...
我正在尝试制作一个sitecraper.我是在我的本地机器上制作的,它在那里工作得很好.当我在我的服务器上执行相同的操作时,它显示403禁止错误.我正在使用PHP Simple HTML DOM Parser.我在服务器上得到的错误是这样的:
警告:file_get_contents(http://example.com/viewProperty.html?id=7715888)[function.file-get-contents]:无法打开流:HTTP请求失败!HTTP/1.1 403禁止在第40行的/home/scraping/simple_html_dom.php中
触发它的代码行是:
$url="http://www.example.com/viewProperty.html?id=".$id;
$html=file_get_html($url);
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我检查了服务器上的php.ini,并且allow_url_fopen是On.可能的解决方案是使用curl,但我需要知道我哪里出错了.
使用ReST/Sphinx标记RESTful Web服务的方法/ URL的最佳方法是什么?是否存在适合使用可能的参数,HTTP方法,标题和正文内容标记URL的默认域?
有点像:
.. rest:method:: GET /api/foo
:param bar: A valid bar
:extension: json or xml
Retrieve foos for the given parameters. E.g.::
GET /api/foo.json?bar=baz
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这样的事情是否已经存在或者是可用的默认扩展之一,还是我必须自己编写一个?
对于我的Microsoft Surface应用程序,我想生成包含一些图像的PDF.我应该怎么做呢?
编辑:我不想转换文本或HTML文档,但我想从头开始创建一个pdf.
在向TTS引擎发送请求时,有没有办法控制TTS引擎的音量?我可以在这里使用AudioManager吗?
谢谢.
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