（1）查找指定扩展名的文件
procedure TForm1.Button1Click(Sender: TObject);
var
sr: TSearchRec;
begin
ListBox1.Items.Clear ;
if FindFirst('D:\work\*.*', faAnyFile, sr) = 0 then
begin
repeat
if pos('.xls',lowercase(sr.Name))>0 then
ListBox1.Items.Add(sr.Name) ;
until FindNext(sr) <> 0;
FindClose(sr);
end;
end;
（2）查找某目录下的所有文件,非目录
procedure TForm1.Button2Click(Sender: TObject);
var
sr: TSearchRec;
begin
ListBox1.Items.Clear ;
if FindFirst('D:\work\*.*', faAnyFile, sr) = 0 then
begin
repeat
if (sr.Attr and faDirectory)=0 then
ListBox1.Items.Add(sr.Name+ ' '+intToStr(sr.Attr)) ;
until FindNext(sr) <> 0;
FindClose(sr);
end;
showMessage(intToStr(ListBox1.Items.count));
end;
（3）查找某目录下的所有目录,包含 “.” “..”
procedure TForm1.Button2Click(Sender: TObject);
var
sr: TSearchRec;
begin
ListBox1.Items.Clear ;
if FindFirst('D:\work\*.*', faAnyFile, sr) = 0 then
begin
repeat
if (sr.Attr and faDirectory)<>0 then
ListBox1.Items.Add(sr.Name+ ' '+intToStr(sr.Attr)) ;
until FindNext(sr) <> 0;
FindClose(sr);
end;
showMessage(intToStr(ListBox1.Items.count));
end;
