var
  Form1: TForm1;
  DirBytes: integer;

implementation

{$R *.dfm}

function 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
      DirBytes := DirBytes + SearchRec.Size
    else
    if DirectoryExists(Dir+Separator+SearchRec.name) then
    begin
      if (SearchRec.name<>'.') and (SearchRec.name<>'..') then
        DirSize(Dir+Separator+SearchRec.name);
    end;
    while FindNext(SearchRec) = 0 do
    begin
      if FileExists(Dir+Separator+SearchRec.name) then
        DirBytes := DirBytes + SearchRec.Size
      else
      if DirectoryExists(Dir+Separator+SearchRec.name) then
      begin
        if (SearchRec.name<>'.') and (SearchRec.name<>'..') then
          DirSize(Dir+Separator+SearchRec.name);
      end;
    end;
  end;
  FindClose(SearchRec);
  Result:=Result+DirBytes;
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
DirBytes:=0;
DirBytes := DirSize('c:\windows');
Label1.Caption := IntToStr(DirBytes);
end;

var
dirbytes : integer;

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 begin
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 begin
dirsize(dir+separator+searchrec.name);
end;
end;
end;
end;
findclose(searchrec);
end;