Re: Starting To Use Xerces

At 16.15 14/12/2006 -0800, appleGuy wrote:

> Hi,
>
> This could be quite a long thread, so please bear with me.
> Ok ive got Xerces installed & its compiling the example correctly.
>
> Now im totally new to XML let alone this parser. Ive contructed the
> following xml file. I need the file to contain data that can be parsed &
> values loaded into predefined variables within my application.. Firstly I
> suppose I need to know if my XML file is ok: (the example uses place holders
> so author in a real file would be a persons name)
>
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <loopcardprj>
>         <_prjsetup>
>                 <title>untitled</title>
>                 <author>author</author>
>                 <subject>subject</subject>
>                 <card>subject</card>
>         </_prjsetup>
>         <_questions>"What Is 5 x 3?","What Is 5 x 5?","What Is 5 x 
> 5?"</_questions>
>         <_answers>"15","25","10"</_answers>
>         <_comment>This is an example of a file layout for the 
> LoopCard Software By
> Alex Curtis</_comment>
> </loopcardprj>

The XML is well-formed; but I would rather use this structure, in 
order to avoid complex application logic to associate a question with 
its answer:

        <_questions>
                <question>
                        <q>What Is 5 x 3?</q>
                        <a>15</a>
                </question>
                <question>
                        <q>What Is 5 x 5?</q>
                        <a>25</a>
                </question>
                <question>
                        <q>What Is 5 + 5?</q>
                        <a>10</a>
                </question>
        </_questions>

> (IF OK): I need to know how to use the parser to parse this file & dump the
> data into the correct variables. I read that DOMBuilder was the class to
> use???

DOMBuilder will build a DOM tree that you will have to navigate 
(DOMDocument->getDocumentElement() will give you the pointer to the 
"loopcardprj" node; from there, getFirstChild()/getNextSibling() will 
give you either text nodes containing whitespace or the 
"_prjsetup"/"_questions" element; and so on.. until you will find 
some text nodes containing the real data).
Alternatively you can use a SAXParser or a SAX2XMLReader that will 
convert the file into a sequence of callbacks (start "loopcardprj" 
element; start "_prjsetup" element; start "title" element; found data 
"untitled"; end "title" element...); if you just need to convert the 
XML file into a C++ data structure, this would be the choice I would made.

Alberto


> Please If you could help, im really new to this XML / Parsing Business...
>
>
> Many Thanks
> -Alex
> --
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