XML帮助请 - 下载一个文件，我不知道如何阅读它 [英] XML Help please - Downloaded a file and I have no clue how to read it

问题描述

我有这个文件已下载



文件从这里开始..

 <？  xml    < span class =code-summarycomment> version   =  1.0   编码  =  ISO-8859-1   ？  >  
  -  <   HostipLookupResultSet     version   =  1.0.1     xmln s：gml   =  http://www.opengis.net/gml < span class =code-attribute>   xmlns：xsi   =  http://www.w3.org/2001/XMLSchema-instance    xsi：noNamespaceSchemaLocation   =  http://www.hostip.info/api/hostip-1.0.1 .xsd >  
 <   gml：description  > 这是Hostip Lookup Service <   / gml：description  >  
 <   gml：name  >  hostip < span class =code-keyword><   / gml：name  >  
  -  <   gml：boundedBy  >  
 <   gml：Null   >  inapplicable <   / gml：Null  >  
 <   / gml：boundedBy  >  
  -  <   gml：featureMember  < span class =code-keyword>>  
  -  <   Hostip  >  
 <   ip  >  107.6.97.20 <   / ip  >  
 <   gml：name  > （未知城市？）<   / gml：name  >  
 < ;   countryName  > （未知国家？）<   / countryName  >  
 <   countryAbbrev  >  XX <   / countryAbbrev  >  
  -  <！ -    坐标不可用
    - >   
 <   / Hostip  >  
 <   / gml：featureMember  >  
 <   / HostipLookupResultSet  >  

文件在这里结束...



我用这段代码捕获它

 使用 client = 新 WebClient（）
  Dim  strFile = client.DownloadString（ String  .Format（<跨越ss =code-string>  http://api.hostip.info/?ip= + IpAddress））

如果这里的数据我只需要..

 <   ip   >  107.6.97.20 <   / ip  >  
 <   gml：name  > （未知城市？）<   / gml：name  < span class =code-keyword>>  
 <   countryName  > （未知国家？）<   / countryName  &g t;  
 <   countryAbbrev  >  XX <   / countryAbbrev   >  

我不知道如何捕获城市，国家和代码并填充文本字段。 />


如果有人能给我一个如何做到这一点的简单例子，我将非常感激。



谢谢，



-Ron

解决方案

它看起来像XML。 :-)



您可以使用.NET FCL提供的任何XML解析器。这是我对它们的简短回顾：

1. 使用 System.Xml.XmlDocument 类。它实现了DOM接口;如果文档的大小不是太大，这种方式是最简单和最好的。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx [ ^ ]。
2. 使用类 System.Xml.XmlTextReader ;这是最快的阅读方式，特别是你需要跳过一些数据。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx [ ^ ]。
3. 使用类 System.Xml.Linq.XDocument ;这是类似于 XmlDocument 的最合适的方式，支持LINQ to XML Programming。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx [ ^ ]，http://msdn.microsoft.com/en-us/library/bb387063.aspx [ ^ ]。

使用 System.Xml.XmlDataDocument ：

首要元素： http://msdn.microsoft.com/en-us/library/system.xml.xmldocument%28v=vs.110%29.aspx [ ^ ]，

to得到任何元素的孩子：

http://msdn.microsoft.com/en-us/library/system.xml.xmlnode.childnodes%28v=vs.110%29.aspx [ ^ ]，

http：// msdn .microsoft.com / zh-cn / library / system.xml.xmlnodelist％28v = vs.110％29.aspx [ ^ ]，

得到孩子：< a href =http://msdn.microsoft.com/en-us/library/system.xml.xmlnodelist.item%28v=vs.110%29.aspx> http://msdn.microsoft.com/en -us /库/ system.xml.xmlnodelist.it em％28v = vs.110％29.aspx [ ^ ]。

-SA

这很简单：

  Dim  IpAddress  as   String  =   
  Dim  client  as  新 WebClient（）
  Dim  strFile  as   string  = client.DownloadString（ String  .Format（  http://api.hostip.info/?ip= {0}，IpAddress））
 
  Dim  xml  as  XDocument = XDocument.Parse（strFile）
  Dim  xnm  as  新 XmlNamespaceManager（ new  NameTable（））
 xnm.AddNamespace（  gml，  http://www.opengis.net/gml）
 Console.WriteLine（xml.XPathSelectElement（  // ip，xnm）.Value）
 Console.WriteLine（xml.XPathSelectElement（  // Hostip / gml：name，xnm）.Value）
 Console.WriteLine（xml.XPathSelectElement（  // countryName，xnm）.Value）
 Console.WriteLine（xml.XPathSelectElement（  // countryAbbrev，xnm）.Value）

I have this file Downloaded

File starts here..

<?xml version="1.0" encoding="ISO-8859-1" ?>
- <HostipLookupResultSet version="1.0.1" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.hostip.info/api/hostip-1.0.1.xsd">
  <gml:description>This is the Hostip Lookup Service</gml:description>
  <gml:name>hostip</gml:name>
- <gml:boundedBy>
  <gml:Null>inapplicable</gml:Null>
  </gml:boundedBy>
- <gml:featureMember>
- <Hostip>
  <ip>107.6.97.20</ip>
  <gml:name>(Unknown City?)</gml:name>
  <countryName>(Unknown Country?)</countryName>
  <countryAbbrev>XX</countryAbbrev>
- <!--  Co-ordinates are unavailable
  -->
  </Hostip>
  </gml:featureMember>
  </HostipLookupResultSet>

File Ends here...

I Capture it with this code

Using client = New WebClient()
Dim strFile = client.DownloadString(String.Format("http://api.hostip.info/?ip=" + IpAddress))

All I need if the data here..

<ip>107.6.97.20</ip>
<gml:name>(Unknown City?)</gml:name>
<countryName>(Unknown Country?)</countryName>
<countryAbbrev>XX</countryAbbrev>

I have no idea how to capture the City, Country and Code and populate a text field.

If someone could provide me a simple example of how to do this, I would be most grateful.

Thanks,

-Ron

解决方案

It looks like XML. :-)

You can use any of the XML parsers offered by .NET FCL. This is my short review of them:

1. Use System.Xml.XmlDocument class. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^].
2. Use the class System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx[^].
3. Use the class System.Xml.Linq.XDocument; this is the most adequate way similar to that of XmlDocument, supporting LINQ to XML Programming.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^], http://msdn.microsoft.com/en-us/library/bb387063.aspx[^].

[EDIT: in response to follow-up questions]

With System.Xml.XmlDataDocument:
Top element: http://msdn.microsoft.com/en-us/library/system.xml.xmldocument%28v=vs.110%29.aspx[^],
to get any element's children:
http://msdn.microsoft.com/en-us/library/system.xml.xmlnode.childnodes%28v=vs.110%29.aspx[^],
http://msdn.microsoft.com/en-us/library/system.xml.xmlnodelist%28v=vs.110%29.aspx[^],
to get child: http://msdn.microsoft.com/en-us/library/system.xml.xmlnodelist.item%28v=vs.110%29.aspx[^].

—SA

It is simple as that:

Dim IpAddress as String = ""
Dim client as New WebClient()
Dim strFile as string = client.DownloadString(String.Format("http://api.hostip.info/?ip={0}",IpAddress))

Dim xml as XDocument = XDocument.Parse(strFile)
Dim xnm as New XmlNamespaceManager(new NameTable())
xnm.AddNamespace("gml", "http://www.opengis.net/gml")
Console.WriteLine(xml.XPathSelectElement("//ip", xnm).Value)
Console.WriteLine(xml.XPathSelectElement("//Hostip/gml:name", xnm).Value)
Console.WriteLine(xml.XPathSelectElement("//countryName", xnm).Value)
Console.WriteLine(xml.XPathSelectElement("//countryAbbrev", xnm).Value)

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