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Parsing this simple XML

Posted on 2008-06-23
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Last Modified: 2010-04-05
Hi,

I have "TMemo" that has XML content like this (see in the code snippet).

How do I parse that XML and display:

- CaseID value
- CaseTitle value

And also display all the "ActivityDate" and "ActivityDetails" from all the <CaseActivity> nodes?

Thanks.


<?xml version="1.0" encoding="utf-8" ?>

<CaseDetailResult xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">

<CaseId>1234567890</CaseId>

<CaseTitle>Testing</CaseTitle>

<CaseStatus>Closed</CaseStatus>

<SerialNumber />

<Activities>

<CaseActivity>

<Activity>Create</Activity>

<ActivityDate>01-01-2008</ActivityDate>

<ActivityDetails>Created by John</ActivityDetails>

</CaseActivity>

<CaseActivity>

<Activity>Status Change</Activity>

<ActivityDate>01-02-2008</ActivityDate>

<ActivityDetails>Case Opened</ActivityDetails>

</CaseActivity>

<CaseActivity>

<Activity>Status Change</Activity>

<ActivityDate>01-03-2008</ActivityDate>

<ActivityDetails>Case Complete</ActivityDetails>

</CaseActivity>

</Activities>

</CaseDetailResult>

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Question by:dudup
1 Comment
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 250 total points
ID: 21851939
here's a quick demo I just wrote up for you using your sample file
I saved your file as "file3.xml" for this demo
unit Unit3;
 

interface
 

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

  StdCtrls,

  MSXML_TLB, comobj, ActiveX;
 

type

  TForm3 = class(TForm)

    Button1: TButton;

    Memo1: TMemo;

    procedure Button1Click(Sender: TObject);

  private

    { Private declarations }

    FDocument : IXMLDOMDocument;

    procedure ParseCaseXML;

  public

    { Public declarations }

  end;
 

var

  Form3: TForm3;
 

implementation
 

{$R *.DFM}
 

procedure TForm3.Button1Click(Sender: TObject);

var

  i: integer;

begin

  FDocument := nil;

  OleCheck(CoCreateInstance(Class_DOMDocument, nil, CLSCTX_ALL,IXMLDOMDocument, FDocument));

  if FDocument <> nil then

  begin

    try

      if not FDocument.load('file3.xml') then

        ShowMessage('Error loading DOMDocument');

      ParseCaseXML;

    finally

      FDocument := nil;

    end;

  end

  else

    ShowMessage('Failed to create XML object');

end;
 

procedure TForm3.ParseCaseXML;

var

 rootnode_, CaseDetailResultNode_, ActivitiesNode_  : IXMLDOMNode;

 tempnode_: IXMLDOMNode;

 lstNodes : IXMLDOMNodeList; // list of activities

 ActivityNode_: IXMLDOMElement;

 activityindex: integer;

begin

  rootnode_ := FDocument.firstChild;

  if rootnode_ = nil then exit;

  CaseDetailResultNode_ := rootnode_.selectSingleNode('//CaseDetailResult');

  if assigned(CaseDetailResultNode_) then

  begin

    tempnode_ := CaseDetailResultNode_.selectSingleNode('CaseId');

    memo1.Lines.add(Format('%s : %s', [tempnode_.nodeName, tempnode_.text] ));

    tempnode_ := CaseDetailResultNode_.selectSingleNode('CaseTitle');

    memo1.Lines.add(Format('%s : %s', [tempnode_.nodeName, tempnode_.text] ));
 

    activityindex := 0; // just a simple visual reference

    ActivitiesNode_ := CaseDetailResultNode_.selectSingleNode('Activities');

    if assigned(ActivitiesNode_) then

    begin

      lstNodes := ActivitiesNode_.selectNodes('CaseActivity');

      if assigned(lstNodes) then

      begin

        ActivityNode_ := lstNodes.nextNode as IXMLDOMElement;

        while assigned(ActivityNode_) do

        begin

          inc(activityindex);

          memo1.lines.add(Format('Activity #%d', [activityindex]));
 

          tempnode_ := ActivityNode_.selectSingleNode('Activity');

          memo1.Lines.add(Format('     %s : %s', [tempnode_.nodeName, tempnode_.text] ));

          tempnode_ := ActivityNode_.selectSingleNode('ActivityDate');

          memo1.Lines.add(Format('     %s : %s', [tempnode_.nodeName, tempnode_.text] ));

          tempnode_ := ActivityNode_.selectSingleNode('ActivityDetails');

          memo1.Lines.add(Format('     %s : %s', [tempnode_.nodeName, tempnode_.text] ));
 

          memo1.lines.add('----------');

          ActivityNode_ := lstNodes.nextNode as IXMLDOMElement;

        end;

      end;

    end;

  end;

end;
 

end.
 
 

**** Form follows ****
 

object Form3: TForm3

  Left = 249

  Top = 107

  Width = 503

  Height = 427

  Caption = 'Form3'

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'MS Sans Serif'

  Font.Style = []

  OldCreateOrder = False

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 24

    Top = 8

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object Memo1: TMemo

    Left = 24

    Top = 52

    Width = 329

    Height = 301

    TabOrder = 1

  end

end

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