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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls, ImgList;

type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    ImageList1: TImageList;
    procedure FormCreate(Sender: TObject);
    procedure FindFilesTree (aTree: tTreeView; aPath: String; aNode: tTreeNode; aWithFiles: Boolean);
  private

  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TForm1 }

type
  pNodeInfo = ^tNodeInfo;
  tNodeInfo = record
      Path: Boolean;
      Name: String;
    end;


procedure TForm1.FindFilesTree(aTree: tTreeView; aPath: String;
  aNode: tTreeNode; aWithFiles: Boolean);
var
  SearchRec: tSearchRec;
  Info: pNodeInfo;
  NodeTmp: tTreeNode;
Begin
  aTree.Items.BeginUpdate;

  If FindFirst (aPath + '*.*', faDirectory, SearchRec) = 0 Then
    Begin
      Repeat
        // Wenn es sich um ein Verzeichnis handelt
        If (SearchRec.Attr and faDirectory = faDirectory)
          and (SearchRec.Name[1] <> '.')
        Then
          Begin
            If (SearchRec.Attr and faDirectory > 0) then
              Begin
                New (Info);
                Info^.Path := True;
                Info^.Name := aPath + SearchRec.Name;

                // zum aktuellen Eintrag hinzufügen
                aNode := aTree.Items.AddChildObject (aNode, SearchRec.Name, Info);
              End;

            // Eintrag merken
            NodeTmp := aNode.Parent;
            // auf Untereinträge prüfen
            FindFilesTree (aTree, aPath + SearchRec.Name, aNode, aWithFiles);
            // Eintrag wiederholen
            aNode := NodeTmp;
          End
        Else
          // Eintrag ist eine Datei
          If aWithFiles
            and (SearchRec.Name <> '.') and (SearchRec.Name <> '..')
          Then
            Begin
              New (Info);
              Info^.Path := False;
              Info^.Name := aPath + SearchRec.Name;
              SearchRec.Name  := ChangeFileExt( SearchRec.Name , '');
              aTree.Items.AddChildObject (aNode, SearchRec.Name, Info);
            End;

      // solange weiter bis keine wieteren Dateien/Verzeichniss gefunden werden
      Until FindNext (SearchRec) <> 0;

      FindClose(SearchRec);
    End;

  aTree.Items.EndUpdate;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  S : String;
begin
  s := ExtractFilePath(Application.ExeName) + 'Testdaten\';
  FindFilesTree (TreeView1, s, nil, True);
end;

end.                    

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...
 Until FindNext (SearchRec) <> 0;
   FindClose(SearchRec);
 End;
  Dispose(Info);
  aTree.Items.EndUpdate;
end;                    

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procedure TForm1.FormDestroy(Sender: TObject);
var
  Info: pNodeInfo;
  i : Integer;
begin
  for i := 0 to TreeView1.Items.Count -1 do
    begin
      if assigned(TreeView1.Items.Item[i]) then
      begin
        Info:=TreeView1.Items.Item[i].Data;
        dispose(Info);
      end;
    end;
  TreeView1.Items.Clear;
end;