轉自萬一  http://www.rzrgm.cn/del/archive/2009/10/16/1584768.html

和 TDirectory.GetFiles 用法一樣, TDirectory.GetDirectories 是用來獲取子目錄的.

另外還有 TDirectory.GetFileSystemEntries 可同時獲取文件與子目錄, 用法都一樣.

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses IOUtils, Types;

const path = 'C:\Program Files\Embarcadero\RAD Studio\7.0';

//獲取指定目錄下的文件與子目錄
procedure TForm1.Button1Click(Sender: TObject);
var
  dfs: TStringDynArray;
  str: string;
begin
  dfs := TDirectory.GetFileSystemEntries(path);
  Memo1.Clear;
  for str in dfs do Memo1.Lines.Add(str);
end;

//獲取指定目錄下的、名稱是 L 開頭的文件與子目錄
procedure TForm1.Button2Click(Sender: TObject);
var
  dfs: TStringDynArray;
  str: string;
begin
  dfs := TDirectory.GetFileSystemEntries(path, 'L*');
  Memo1.Clear;
  for str in dfs do Memo1.Lines.Add(str);
end;

//獲取指定目錄及嵌套目錄下的所有文件與子目錄
procedure TForm1.Button3Click(Sender: TObject);
var
  dfs: TStringDynArray;
  str: string;
begin
  dfs := TDirectory.GetFileSystemEntries(path + '\source', TSearchOption.soAllDirectories, nil);
  Memo1.Clear;
  for str in dfs do Memo1.Lines.Add(str);
end;

//使用 TDirectory.TFilterPredicate 函數參數
procedure TForm1.Button4Click(Sender: TObject);
var
  dfs: TStringDynArray;
begin
  Memo1.Clear;
  dfs := TDirectory.GetFileSystemEntries(path,
    function(const Path: string; const SearchRec: TSearchRec): Boolean
    begin
      //這里可以有更多過濾條件或其他處理
      Memo1.Lines.Add(Path + '\' + SearchRec.Name);
    end
  );
end;

end.