Node上的GDataXML nodesForXPath包含整个GDataXMLDocument的项目

时间：2014-03-02 19:08:28

标签： objective-c xml xpath gdataxml

我正在尝试创建一个iOS应用程序（除了其他一些东西）需要加载Wordpress-Page的内容

当我使用Wordpress的XML-RPC功能中的getPosts功能时，我得到以下内容：

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
  <params>
    <param>
      <value>
      <array><data>
  <value><struct>
  <member><name>post_id</name><value><string>23</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post1&lt;!--:--&gt;&lt;!--:en--&gt;Post1&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20140211T14:26:39</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20140211T12:26:39</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:32:45</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:32:45</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>im-notfall</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post1&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post1&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=23</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=23</string></value></member>
  <member><name>menu_order</name><value><int>5</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
  <value><struct>
  <member><name>post_id</name><value><string>9</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post2&lt;!--:--&gt;&lt;!--:en--&gt;Post2&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20140206T13:16:56</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20140206T11:16:56</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:33:01</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:33:01</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>neuer-erster-beitrag</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post2&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post2&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=9</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=9</string></value></member>
  <member><name>menu_order</name><value><int>3</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
  <value><struct>
  <member><name>post_id</name><value><string>5</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post3&lt;!--:--&gt;&lt;!--:en--&gt;Post3&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20131217T17:32:09</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20131217T15:32:09</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:33:18</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:33:18</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>test-beitrag-2</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post3&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post3&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=5</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=5</string></value></member>
  <member><name>menu_order</name><value><int>4</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
</data></array>
      </value>
    </param>
  </params>
</methodResponse>

现在我正试图通过以下两个foreach语句获得我需要的一些字段（内容，标题，ID等）：

GDataXMLDocument *XMLdoc = [[GDataXMLDocument alloc] initWithData:XMLcontent options:0 error:nil];
NSArray *XMLofPosts = [XMLdoc  nodesForXPath:@"//methodResponse/params/param/value/array/data/value" error:nil];

for(GDataXMLNode *post in XMLofPosts){
    NSArray *postMembers = [post nodesForXPath:@"//value/struct/member" error:nil];
    for(GDataXMLElement *postMember in postMembers){
        NSString *key = [[[postMember elementsForName:@"name"] objectAtIndex:0] stringValue];
        NSString *value = [[[postMember elementsForName:@"value"] objectAtIndex:0] stringValue];
        // ...
    }
}

但是我遇到了这个问题，postMembers包含XML Document中的所有成员，而不仅仅是一个“post”的成员。 我做错了什么或有办法解决这个问题吗？

1 个答案:

答案 0 :(得分：0)

对于以/开头的任何XPath查询，您告诉XPath引擎忽略当前上下文并从根开始。使用//value，无论您传递的是哪种上下文项，都要查询来自根的所有<value/>元素。

使用以下XPath查询应返回您要查找的元素：

  1. 查找上下文。我在开头删除了不必要的第二个/（这会降低对查询的评估速度）并添加/struct轴步（我想你只是忘记了？）。

    /methodResponse/params/param/value/array/data

  2. 返回当前上下文的所有<member/>：

    value/struct/member

    或者您也可以使用

    明确表示使用当前上下文.（我更喜欢，因为它清楚地说明了我想要的XPath表达式）。 
    ./value/struct/member
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