//选择文件夹

function SelectFolderDialog(const Handle: integer;
  const Caption: string;
  const InitFolder: WideString;
  var SelectedFolder: string): boolean;
var
  BInfo: _browseinfo;
  Buffer: array[0..MAX_PATH] of
  Char;
  ID: IShellFolder;
  Eaten, Attribute: Cardinal;
  ItemID:
  PItemidlist;
begin
  Result := False;
  BInfo.HwndOwner := Handle;
  BInfo.lpfn := nil;
  BInfo.lpszTitle := Pchar(Caption);
  BInfo.ulFlags := BIF_RETURNONLYFSDIRS + BIF_NEWDIALOGSTYLE;
  SHGetDesktopFolder(ID);
  ID.ParseDisplayName(0, nil,
  PWideChar(InitFolder), Eaten, ItemID, Attribute);
  BInfo.pidlRoot := ItemID;
  GetMem(BInfo.pszDisplayName, MAX_PATH);
  try
    if SHGetPathFromIDList(SHBrowseForFolder(BInfo), Buffer) then
    begin
      SelectedFolder := Buffer;
      if Length(SelectedFolder) <> 3 then SelectedFolder := SelectedFolder + '\';
      result := True;
    end
    else
    begin
      SelectedFolder := '';
      Result := False;
    end;
  finally
    FreeMem(BInfo.pszDisplayName);
  end;
end;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

var
NewDir: string;

begin
if SelectFolderDialog(Handle, '选择', '', NewDir)
then
label1.Caption:=NewDir;
end;

end.

//搜索目录下所有文件

function MakeFileList(Path,FileExt:string):TStringList
;
var
sch:TSearchrec;
begin
Result:=TStringlist.Create;

if rightStr(trim(Path), 1) <> '\' then
    Path := trim(Path) +
'\'
else
    Path := trim(Path);

if not DirectoryExists(Path) then
begin
    Result.Clear;
   
exit;
end;

if FindFirst(Path + '*', faAnyfile, sch) = 0 then
begin
   
repeat
       Application.ProcessMessages;
       if ((sch.Name = '.') or
(sch.Name = '..')) then Continue;
       if DirectoryExists(Path+sch.Name)
then   // 这个地方加上一个判断，可以区别子文件夹河当前文件夹的操作
       begin
        
Result.AddStrings(MakeFileList(Path+sch.Name,FileExt));
       end
      
else
       begin
         if (UpperCase(extractfileext(Path+sch.Name)) =
UpperCase(FileExt)) or (FileExt='.*') then
        
Result.Add(Path+sch.Name);
       end;
    until FindNext(sch) <>
0;
    SysUtils.FindClose(sch);
end;
end;

//

ListBox1.Items:= MakeFileList(Label1.Caption ,'.*');//后面是类型