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reading_20rss_20feeds [2018/03/31 13:19] – external edit 127.0.0.1reading_20rss_20feeds [2024/01/05 00:21] (current) – external edit 127.0.0.1
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   * Extract the wanted information by parsing the contents of the XML file.   * Extract the wanted information by parsing the contents of the XML file.
 \\  Downloading the RSS data can easily be achieved by calling the function **PROCurldownload** which can be found [[/Downloading%20a%20file%20from%20a%20URL|here]] (there are two versions of the procedure listed in that article; the second, longer, version may be more reliable). Extracting the wanted information from the file can be achieved by calling routines within the [[/Libraries|XMLLIB library]].\\ \\  RSS data is **hierarchical**, and the structure of the data is reflected in the structure of the XML file. If you want to examine what data is available in a particular RSS feed you can adapt the program **xml2tree** (available [[http://groups.yahoo.com/group/bb4w/files/WindowsAPI/xml2tree.bbc|here]]) by changing the URL to that of the feed you are interested in; the program displays the data as a **Tree View**.\\ \\  Here is a typical example of the hierarchy of the parts of an RSS feed in which you are most likely to be interested:\\ \\  \\  Downloading the RSS data can easily be achieved by calling the function **PROCurldownload** which can be found [[/Downloading%20a%20file%20from%20a%20URL|here]] (there are two versions of the procedure listed in that article; the second, longer, version may be more reliable). Extracting the wanted information from the file can be achieved by calling routines within the [[/Libraries|XMLLIB library]].\\ \\  RSS data is **hierarchical**, and the structure of the data is reflected in the structure of the XML file. If you want to examine what data is available in a particular RSS feed you can adapt the program **xml2tree** (available [[http://groups.yahoo.com/group/bb4w/files/WindowsAPI/xml2tree.bbc|here]]) by changing the URL to that of the feed you are interested in; the program displays the data as a **Tree View**.\\ \\  Here is a typical example of the hierarchy of the parts of an RSS feed in which you are most likely to be interested:\\ \\ 
 +<code>
   <rss>   <rss>
     <channel>     <channel>
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         <title>         <title>
         <description>         <description>
 +</code>
 To illustrate the process of downloading, extracting and using the data two examples follow; both make use of RSS feeds provided by the BBC.\\ \\  To illustrate the process of downloading, extracting and using the data two examples follow; both make use of RSS feeds provided by the BBC.\\ \\ 
 ==== Weather example ==== ==== Weather example ====
 \\  The code below displays a summary of the weather forecast for the next three days (if you happen to live in Buckingham!):\\ \\  \\  The code below displays a summary of the weather forecast for the next three days (if you happen to live in Buckingham!):\\ \\ 
 +<code bb4w>
         INSTALL @lib$+"XMLLIB"         INSTALL @lib$+"XMLLIB"
  
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         PROC_exitXML(xml{})         PROC_exitXML(xml{})
         END         END
 +</code>
 If you want a more detailed forecast you can include the 'description' data as well as the 'title':\\ \\  If you want a more detailed forecast you can include the 'description' data as well as the 'title':\\ \\ 
 +<code bb4w>
         INSTALL @lib$+"XMLLIB"         INSTALL @lib$+"XMLLIB"
  
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         PROC_exitXML(xml{})         PROC_exitXML(xml{})
         END         END
 +</code>
 \\  \\ 
 ==== News example ==== ==== News example ====
 \\  The code below lists the news headlines:\\ \\  \\  The code below lists the news headlines:\\ \\ 
 +<code bb4w>
         INSTALL @lib$+"XMLLIB"         INSTALL @lib$+"XMLLIB"
  
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         PROC_exitXML(xml{})         PROC_exitXML(xml{})
         END         END
 +</code>
 VDU 14 is used to pause the display at the end of each page until **Shift** is pressed. VDU 14 is used to pause the display at the end of each page until **Shift** is pressed.
reading_20rss_20feeds.1522502377.txt.gz · Last modified: 2024/01/05 00:16 (external edit)