Pascal (Lazarus/Delphi)

Iterate over Direct Children with a Specific Tag

See more XML Examples

Demonstrates how to iterate over direct children 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;
  numWithTag: Integer;
  i: Integer;

begin
  success := False;

  xml := TXml.Create;

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

  //   Get the number of direct children having the tag "fruit";
  numWithTag := xml.NumChildrenHavingTag('fruit');

  if (numWithTag > 0) then
    begin

      for i := 0 to numWithTag - 1 do
        begin
          child := xml.GetNthChildWithTag('fruit',i);
          WriteLn(i + ': ' + child.Tag + ' : ' + child.Content);
          child.Free;
        end;

      WriteLn('-----');

      //  Do the same as the above loop, but instead of creating
      //  a new object instance for each child, call GetNthChildWithTag2 to
      //  update the object's reference instead.
      for i := 0 to numWithTag - 1 do
        begin
          //  Navigate to the Nth child.  
          success := xml.GetNthChildWithTag2('fruit',i);
          WriteLn(i + ': ' + xml.Tag + ' : ' + xml.Content);
          //  Navigate back up to the parent:
          success := xml.GetParent2();
        end;

      WriteLn('-----');
    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.