1-得到短文件名
function GetShortFileName(const FileName : string) : string;
var
  aTmp: array[0..255] of char;
begin
  if GetShortPathName(PChar(FileName),aTmp,Sizeof(aTmp)-1)=0 then
     Result:= FileName
  else
     Result:=StrPas(aTmp);
end;
2-长文件名
function GetLongFileName(const FileName : string) : string;
var
  aInfo: TSHFileInfo;
begin
  if SHGetFileInfo(PChar(FileName),0,aInfo,Sizeof(aInfo),SHGFI_DISPLAYNAME)<>0 then
     Result:= string(aInfo.szDisplayName)
  else
     Result:= FileName;
end;

删除到回收站
uses ShellAPI;

procedure SendToRecycleBin(FileName: string);
var
  SHF: TSHFileOpStruct;
begin
  with SHF do begin
    Wnd := Application.Handle;
    wFunc := FO_DELETE;
    pFrom := PChar(FileName);
    fFlags := FOF_SILENT or FOF_ALLOWUNDO;
  end;
  SHFileOperation(SHF);
end;

得到文件最后改动时间
procedure TForm1.Button1Click(Sender: TObject);
var
  FileHandle : THandle;
  LocalFileTime : TFileTime;
  DosFileTime : DWORD;
  LastAccessedTime : TDateTime;
  FindData : TWin32FindData;
begin
  FileHandle := FindFirstFile('AnyFile.FIL', FindData);
  if FileHandle <> INVALID_HANDLE_VALUE then
  begin
    Windows.FindClose(Handle);
    if (FindData.dwFileAttributes and FILE_ATTRIBUTE_DIRECTORY) = 0 then
    begin
      FileTimeToLocalFileTime(FindData.ftLastWriteTime, LocalFileTime);
      FileTimeToDosDateTime(LocalFileTime,
      LongRec(DosFileTime).Hi,LongRec(DosFileTime).Lo);
      LastAccessedTime := FileDateToDateTime(DosFileTime);
      Label1.Caption := DateTimeToStr(LastAccessedTime);
    end;
  end;
end;

得到目录大小
function TFileBrowser.DirSize(Dir:string):integer;
  var
  SearchRec : TSearchRec;
  Separator : string;

begin
  if Copy(Dir,Length(Dir),1)='\' then
    Separator := ''
  else
    Separator := '\';
  if FindFirst(Dir+Separator+'*.*',faAnyFile,SearchRec) = 0 then
  begin
    if FileExists(Dir+Separator+SearchRec.name) then
    begin
      DirBytes := DirBytes + SearchRec.Size;
      {Memo1.Lines.Add(Dir+Separator+SearchRec.Name);}
    end
    else
      if DirectoryExists(Dir+Separator+SearchRec.name) then
      begin
        if (SearchRec.name<>'.') and (SearchRec.name<>'..') then
          DirSize(Dir+Separator+SearchRec.name);
      end;
    end;
    while FindNext(SearchRec) = 0 do
    begin
      if FileExists(Dir+Separator+SearchRec.name) then
      begin
        DirBytes := DirBytes + SearchRec.Size;
        {Memo1.Lines.Add(Dir+Separator+SearchRec.Name);}
      end
      else
        if DirectoryExists(Dir+Separator+SearchRec.name) then
        begin
          if (SearchRec.name<>'.') and (SearchRec.name<>'..') then
            DirSize(Dir+Separator+SearchRec.name);
        end;
      end;
    end;
  end;
  FindClose(SearchRec);
end;
扫描驱动器
  private
    { Private declarations }
    FScanAborted: Boolean;

  public
    { Public declarations }
    function ScanDrive( root, filemask: string; hitlist: TStrings ): Boolean;


function TForm1.ScanDrive( root, filemask: string; hitlist: TStrings ):
Boolean;
  function ScanDirectory( var path: string ): Boolean;
    var
      SRec: TSearchRec;
      pathlen: Integer;
      res: Integer;
    begin
      label1.caption := path;
      pathlen:= Length(path);
      { first pass, files }
      res := FindFirst( path+filemask, faAnyfile, SRec );
      if res = 0 then
      try
        while res = 0 do begin
          hitlist.Add( path + SRec.name );
          res := FindNext(SRec);
        end;
      finally
        FindClose(SRec)
      end;
      Application.ProcessMessages;
      Result := not (FScanAborted or Application.Terminated);
      if not Result then Exit;

      {second pass, directories}
      res := FindFirst( path+'*.*', faDirectory, SRec );
      if res = 0 then
      try
        while (res = 0) and Result do begin
          if ((Srec.Attr and faDirectory) = faDirectory) and
             (Srec.name[1] <> '.')
          then begin
            path := path + SRec.name + '\';
            Result := ScanDirectory( path );
            SetLength( path, pathlen );
          end;
          res := FindNext(SRec);
        end;
      finally
        FindClose(SRec)
      end;
    end;
begin
  FScanAborted := False;
  Screen.Cursor := crHourglass;
  try
    Result := ScanDirectory(root);
  finally
    Screen.Cursor := crDefault
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
   ch: Char;
   root: string;
begin
   root := 'C:\';
   for ch := 'A' to 'Z' do begin
     root[1] := ch;
     case GetDriveType( Pchar( root )) of
       DRIVE_FIXED, DRIVE_REMOTE:
         if not ScanDrive( root, edit1.text, listbox1.items ) then
           Break;
     end;
   end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin // aborts scan
  fScanAborted := True;
end;

改目录名
var
  OldName,NewName : string;

  .
  .
  OldName := 'C:\UTILITIES';
  NewName := 'C:\UTILS';
  if MoveFile(PChar(OldName), PChar(NewName)) then
ShowMessage('Directory renamed!')
                                     else ShowMessage('Failure
renaming directory!');
  .
  .
end.  

临时文件
function DGetTempFileName (const Folder, Prefix : string; const Unique: UINT) : string;
var
   FileName : array[0..MAX_PATH] of Char;
begin
   if GetTempFileName (PChar (Folder), PChar (Prefix), Unique, FileName) = 0 then
       raise Exception.Create ('GetTempFileName error');
   Result := FileName;
end;