delphi 文件或目录转换成 TreeView

//文件或目录转换成 TreeView

procedure DirToTreeView(Tree: TTreeView; Directory:
string; Root: TTreeNode;
IncludeFiles:
  Boolean);
var
  SearchRec         :
TSearchRec;
  ItemTemp          :
TTreeNode;
begin
  with Tree.Items do
  try
    BeginUpdate;
    if Directory[Length(Directory)] <> ‘\‘ then Directory :=
Directory + ‘\‘;
    if FindFirst(Directory +
‘*.*‘, faDirectory, SearchRec) = 0 then
    begin
      repeat
        if (SearchRec.Attr and faDirectory =
faDirectory) and (SearchRec.Name[1] <> ‘.‘) then
        begin
          if (SearchRec.Attr and faDirectory >
0) then
            Root
:= AddChild(Root,
SearchRec.Name);
          ItemTemp
:=
Root.Parent;
          DirToTreeView(Tree,
Directory + SearchRec.Name, Root,
IncludeFiles);
          Root
:=
ItemTemp;
        end
        else if
IncludeFiles then
          if SearchRec.Name[1]
<> ‘.‘ then
            AddChild(Root,
SearchRec.Name);
      until FindNext(SearchRec) <> 0;
      FindClose(SearchRec);
    end;
  finally
    EndUpdate;
  end;
end;

procedure TForm1.ToolButton7Click(Sender:
TObject);
var
  node:TTreeNode;
begin

node:=nil;//放在OnCreate下面可以正常
    DirToTreeView(TreeView1,‘Z:\‘,node,False);
end;