IPhone: The first hpple test to parse the third library of HTML

After one day, I want to use hpple to easily parse HTML using XPath.

Reference is the practice here: http://lwxshow.com/ios-iphone-development-teaches-you-how-to-use-the-objective-c-parsing-html-lwxshow-com

(Related:

Http://stackoverflow.com/questions/405749/parsing-html-on-the-iphone

Http://stackoverflow.com/questions/9746745/xpath-attributes-selection

)

It said in a very detailed: Is to reference the https://github.com/topfunky/hpple on the hpple library, combined with libxml, you can use XPath to search HTML.

For more information about XPath, see w3school's tutorial http://www.w3school.com.cn/xpath/index.asp

After the related configuration is complete, you can use it directly:

-( Void  ) Viewdidload {[Super viewdidload]; nserror * Error; nsdata * Htmldata =[[Nsstring stringwithcontentsofurl: [nsurl urlwithstring:  @"  Http://dict.youdao.com/m/search? Keyfrom = dict. mindex & vendor = & Q = Apple  "  ] Encoding: nsasciistringencoding error: & Error] datausingencoding: nsutf8stringencoding]; tfhpple * Xpathparser = [[Tfhpple alloc] initwithhtmldata: htmldata]; nsarray * Elements = [xpathparser searchwithxpathquery: @"  // Title " ]; //  Get the title Nslog ( @"  % D  "  , [Elements count]); tfhppleelement * Element = [elements objectatindex: 0  ]; Nsstring * Content = [Element content]; nsstring * Tagname = [Element tagname]; nsstring * ATTR = [element objectforkey: @"  Href "  ]; Nslog (  @"  Content =% @  "  , Content); nslog (  @"  Tagname = % @  "  , Tagname); nslog (  @"  ATTR is =% @  "  , ATTR );} 

 

This should be the case when using the project. This method can quickly find the corresponding node, as long as you are familiar with the XPATH rules.

However, I don't know what went wrong. My content cannot be displayed all the time, but the corresponding node is correct because its attributes can be captured. I have found a lot and I don't know why. If I know why, please leave a message!