Pascal (Lazarus/Delphi)

Find Direct Child with Specific Tag

See more XML Examples

Demonstrates how to find a direct child having a specific tag.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Xml;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  xml: TXml;
  child: TXml;

begin
  success := False;

  xml := TXml.Create;

  //  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
  success := xml.LoadXmlFile('qa_data/xml/fruit.xml');
  if (success = False) then
    begin
      WriteLn(xml.LastErrorText);
      Exit;
    end;

  //  Find the direct child node having the tag "meat", and 
  //  return a new instance of the XML object referencing the
  //  child node, if found.
  child := xml.FindChild('meat');
  if (xml.LastMethodSuccess = False) then
    begin
      WriteLn('No direct child having the tag "meat" was found.');
    end
  else
    begin
      WriteLn('Content = ' + child.Content);
      child.Free;
    end;

  //  The same can be accomplished without creating a new 
  //  XML object instance.  Instead, the FindChild2 method updates
  //  the caller's internal reference to the found child, if successful.
  success := xml.FindChild2('meat');
  if (success = True) then
    begin
      //  Success!  The xml object now references the found child.
      WriteLn('Content = ' + xml.Content);
      //  Restore the reference back to the parent.
      success := xml.GetParent2();
    end
  else
    begin
      WriteLn('No direct child having the tag "meat" was found.');
    end;


  xml.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.