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read and parse an xml file

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  • read and parse an xml file

    attached is an events.xml file and xbasic code.
    When you open the xml in notepad it opens as one continuous line.
    I need to read the XML file and start a new line when there is a
    <event> or after </event>

    I can write the xml file to a table but only after I manually open in notepad, add line breaks and then save.
    The attached code will write the xml file to a table if each event_id is on a separate line.

    Any help would be appreciated.
    Charlie Crimmel

  • #2
    Re: read and parse an xml file

    "What's New in V9" has an extensive section on parsing XML with A5.


    • #3
      Re: read and parse an xml file


      I was also going to suggest the XML parser as an other option. As well as the stringscanner object.

      To answer your question directly. To get each event on its own line you could use the following
      xml_data = file.to_string("YourFilename")
      xml_data = stritran(xml_data,"</event><event>","</event><event>"+crlf())
      At this point you could write the data back to a file So that your current code can use it. But since you now have it in a variable I would just use the text in the variable. You would need to make a few changes to use it but I will leave that up to you :)
      Tim Kiebert
      Eagle Creek Citrus
      A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


      • #4
        Re: read and parse an xml file

        I have extensive experience in using the stringscanner functions, and you can get almost every XML job done with it.

        However, it does not give you the feeling of being a "native solution" to parse XML. You are just 'constructing' an 'alternative' solution that would work.

        I have some heavy XML operations ahead of me, and I will investigate the XML functions that are available in V9 now first.

        I think that XML handling is one of those things that hardly will be used by the average Alpha Five user, but almost in any case need to be used by the professional that builds for medium to larger companies. It would be great if Alpha would have more user friendly solutions to handle it.

        However, it would also mean a bridge between OO-structured programming and linear XBasic programming, which might turn out rather difficult to realize?


        • #5
          Re: read and parse an xml file

          Using this code:
          xml_data = ""
          xml_data2 = ""
          xml_data = file.to_string("c:\alpha5v9\BSECalendar\text14\zzparse.txt")
          xml_data = stritran(xml_data,"</event><event>","</event><event>"+crlf())

          Gives these results in the trace window.
          How can I get rid of the <data><events><event> on the first line

          <data><events><event><event_id> 26</event_id><title>P-card Audit</title><date>02/01/2010</date><date_to>02/01/2010</date_to><time>08:30</time><time_to>04:30</time_to><category>Business</category><location>Lakin Hospital</location><recursive_freq>Does Not repeat</recursive_freq><description>P-card Audit</description><url>Needs to link to the Edit Events Form?Event_Id=26</url><image>Images/Pcard.jpg</image></event><event>

          <event_id> 27</event_id><title>P-Card Audit</title><date>02/08/2010</date><date_to>02/08/2010</date_to><time>08:30</time><time_to>04:30</time_to><category>Business</category><location>Diamond Building</location><recursive_freq>Repeats Weekly</recursive_freq><description>P-Card Audit</description><url>Needs to link to the Edit Events Form?Event_Id=27</url><image>Images/Pcard.jpg</image></event><event>

          <event_id> 28</event_id><title>P-Card-Elkins</title><date>02/22/2010</date><date_to>02/26/2010</date_to><time>08:30</time><time_to>04:30</time_to><category>Business</category><location>Elkins Children Home</location><recursive_freq>Does Not repeat</recursive_freq><description>P-Card-Elkins</description><url>Needs to link to the Edit Events Form?Event_Id=28</url><image>Images/Pcard.jpg</image></event><event>

          <event_id> 29</event_id><title>P-card-Welch</title><date>03/01/2010</date><date_to>03/02/2010</date_to><time>08:30</time><time_to>04:30</time_to><category>Business</category><location>Welch-BCF Social Services</location><recursive_freq>Does Not repeat</recursive_freq><description>P-card-Welch</description><url>Needs to link to the Edit Events Form?Event_Id=29</url><image>Images/Pcard.jpg</image></event><event>

          <event_id> 30</event_id><title>test 2nd Event</title><date>02/05/2010</date><date_to>02/05/2010</date_to><time>08:00</time><time_to>10:00</time_to><category>Business</category><location>WVDHHR</location><recursive_freq>Does Not repeat</recursive_freq><description>test 2nd Event</description><url>Needs to link to the Edit Events Form?Event_Id=30</url><image>Images/Pcard.jpg</image></event><event>

          <event_id> 31</event_id><title>test 1st Event</title><date>02/05/2010</date><date_to>02/05/2010</date_to><time>10:30</time><time_to>12:00</time_to><category>Business</category><location>WVDHHR</location><recursive_freq>Does Not repeat</recursive_freq><description>test 1st Event</description><url>Needs to link to the Edit Events Form?Event_Id=31</url><image>Images/Pcard.jpg</image></event></events


          • #6
            Re: read and parse an xml file

            Originally posted by crimmelcp View Post
            How can I get rid of the <data><events><event> on the first line
            Do you really need to get rid of it?
            In the code you provided in the first post you are using 'extract_string'. This will ignore any extra data that you don't need.
            Tim Kiebert
            Eagle Creek Citrus
            A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


            • #7
              Re: read and parse an xml file

              How can I get rid of the <data><events><event> on the first line
              ln = "<data><events><event><event_id> 26</event_id><title>P-card "

              newline = strtran(ln,"<data><events><event>","")
              ? newline
              = "<event_id> 26</event_id><title>P-card "
              xml_data = stritran(xml_data,"</event><event>","</event><event>"+crlf()) 'present line
              xml_data = strtran(xml_data,"<data><events><event>","",1,1) 'new line after that
              There can be only one.


              • #8
                Re: read and parse an xml file

                That works fine when I view in trace window.
                each Event_id is on a separate line

                But when I write to a table then all of the event_id's are on the same line again.
                Any ideas

                xml_data = file.to_string("c:\alpha5v9\BSECalendar\text14\zzparse.txt")
                xml_data1 = stritran(xml_data,"</event><event>","</event><event>"+crlf()) 'present line
                xml_data1 = strtran(xml_data1,"<data><events><event>","",1,1) 'new line after that

                t.Record1 = substr(xml_data1,1,150)
                t.Record2 = substr(xml_data1,151,151)
                t.Record3 = substr(xml_data1,302,150)


                • #9
                  Re: read and parse an xml file

                  Can you attach a sample of the original xml file? I'm not seeing what you're seeing.


                  I think I know what you are saying now.

                  The whole of the text file is stores in a variable xml_data1. You are parsing out the 1-150th characters, the 151-302 characters, and the 302-452 characters. A crlf() is a character so that gets read just like any other.

                  Change your script to

                  xml_data = file.to_string("c:\temp\zzparse.txt")
                  xml_data1 = stritran(xml_data,"</event><event>","</event><event>"+crlf()) 'present line
                  xml_data1 = strtran(xml_data1,"<data><events><event>","",1,1) 'new line after that
                  fst_line = word(xml_data1,1,crlf()) [COLOR="Red"]'get the first line (start to crlf())[/COLOR] and parse that
                  t.Record1 = substr(fst_line,1,150)
                  t.Record2 = substr(fst_line,151,151)
                  t.Record3 = substr(fst_line,302,150)
                  Last edited by Stan Mathews; 02-24-2010, 05:18 PM.
                  There can be only one.