(Delphi DLL) Traverse the XML Tree

Demonstrates how to traverse all nodes in an XML tree.

Note: This example requires Chilkat v9.5.0.77 or greater.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringBuilder, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
xml: HCkXml;
success: Boolean;
sbState: HCkStringBuilder;

begin
// Use the NextInTraversal2 method to traverse all nodes in the XML tree rooted at the caller.

xml := CkXml_Create();

success := CkXml_LoadXmlFile(xml,'qa_data/xml/twoPigs.xml');

// This is the XML traversed in this example:

// <pig-rescue>
//   <herd name="Cathy">
// 	<species name="pot belly pig">
// 	    <animal>
// 	        <name>Molly II</name>
// 	        <birth>February, 1998</birth>
// 			<in-date>January, 2000</in-date>
// 			<from>Middle Ave.</from>
// 			<gender spay-neuter="yes">F</gender>
// 			<info>Molly came from a place where an old, ill man had too many animals.
// 	              	The animals were seldom fed and rats would eat the newborn piglets.
// 	             	 When Molly was found at one week old, she was the only piglet of 
// 	              	her siblings who did not get stepped on by a cow. She is a sweet, 
// 	              	friendly pig who likes to hang out on Cathy's porch on the lounge 
// 	              	pad.
// 			</info>
// 		</animal>
// 	    <animal>
// 			<name>Nigel</name>
// 			<birth>June, 1991</birth>
// 			<in-date>August, 1991</in-date>
// 			<from>Breeder</from>
// 			<gender spay-neuter="no">M</gender>
// 			<info>
// 			 	Nigel was the first pig and the reason for the rescue in the
// 			 	first place. He is 13 now and doing well, but takes a number 
// 				of medications, as you can see below.
// 			</info>
// 		</animal>		
// 	</species>
//   </herd>
// </pig-rescue>

// The sbState is an object used to keep track of the current state of the traversal.
sbState := CkStringBuilder_Create();
while CkXml_NextInTraversal2(xml,sbState) <> False do
  begin

    Memo1.Lines.Add(CkXml__tag(xml));
    Memo1.Lines.Add(CkXml__tagPath(xml));
    Memo1.Lines.Add('');

  end;

// Produces the following output:

// herd
// herd
// 
// species
// herd|species
// 
// animal
// herd|species|animal[0]
// 
// name
// herd|species|animal[0]|name
// 
// birth
// herd|species|animal[0]|birth
// 
// in-date
// herd|species|animal[0]|in-date
// 
// from
// herd|species|animal[0]|from
// 
// gender
// herd|species|animal[0]|gender
// 
// info
// herd|species|animal[0]|info
// 
// animal
// herd|species|animal[1]
// 
// name
// herd|species|animal[1]|name
// 
// birth
// herd|species|animal[1]|birth
// 
// in-date
// herd|species|animal[1]|in-date
// 
// from
// herd|species|animal[1]|from
// 
// gender
// herd|species|animal[1]|gender
// 
// info
// herd|species|animal[1]|info
// 

CkXml_Dispose(xml);
CkStringBuilder_Dispose(sbState);

end;