Delphi: XML Node goes EInvalidPointer When I try to Access It

Question

I try to load a node only to face the EInvalidPointer error on Delphi.

My "xml" goes this way:

<RYCFile>
    <GeneralInfo>
        <SystemName/>
        <NSpecies>1</NSpecies>
        <NMaxCriterias>2</NMaxCriterias>
    <MaxRating>1</MaxRating>
        <SystemType>0</SystemType>
        <EvolutivePointCost>1</EvolutivePointCost>
    </GeneralInfo>
    <Race Index="1">
        <RaceName>Race #1</RaceName>
        <NumCriterias>2</NumCriterias>
        <Criteria Index="1">
            <Name>Criteria #1</Name>
                <NSubCriterias>0</NSubCriterias>
                <Limiter>0</Limiter>
            </Criteria>
            <Criteria Index="2">
                <Name>Criteria #2</Name>
                <NSubCriterias>0</NSubCriterias>
                <Limiter>0</Limiter>
            </Criteria>
        </Race>
</RYCFile>

I can't even read the DocumentElement.

I've googled everywhere but I'm at wit's end, it seems. Can't seem to find a solution remotely adapted to what I'm enduring.

Code used to "read":

FormSkeletonMaker.XMLDocumentFile.LoadFromFile(FileName);
FormSkeletonMaker.XMLDocumentFile.Active := True;
iNode := FormSkeletonMaker.XMLDocumentFile.ChildNodes.FindNode('GenInfo');

right now it goes this way. I'm barely testing the ability for this document to get loaded (it was made on the same program).

I updated the original post. Far more readable.

AdelC
– AdelC

2012-04-01 02:36:49 +00:00
Commented Apr 1, 2012 at 2:36 — AdelC
– AdelC, Commented Apr 1, 2012 at 2:36
please use four spaces instead of "> " to format code

dldnh
– dldnh

2012-04-02 00:15:42 +00:00
Commented Apr 2, 2012 at 0:15 — dldnh
– dldnh, Commented Apr 2, 2012 at 0:15

Remy Lebeau · Accepted Answer · 2012-04-01 02:41:40Z

4

If the DocumentElement property fails, then either the FormSkeletonMaker or XMLDocumentFile object pointer is invalid.

answered Apr 1, 2012 at 2:41

Remy Lebeau

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3 Comments

AdelC Over a year ago

The Form can't be the one behind it. I chose to make XMLDocumentFile a component in my program (no dynamic loading or anything). If anything, I try Showmessage(XMLDocumentFile.XML.Text); and I get the whole xml.

AdelC Over a year ago

It seems you're right. Somewhere the XMLDocumentFile went astray - I treated it like a dynamic one while it was static. Bad, bad error. The old code I tried out was using dynamic stuff and it didn't work simply because I had to create the xml document.

Remy Lebeau Over a year ago

If you create a TXMLDocument dynamically without an Owner specified, it acts as a reference-counted interface (this is stated as much in the documentation), so you have to be extra careful of that. Better to use the NewXMLDocument() and LoadXML...() functions instead, which return an IXMLDocument interface.

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