Retrieve folder size

Problem/Question/Abstract:

This function tells you how many bytes a folder, with all subfolders and contained files is taking on a HD, CD, floppy or whatever.

Answer:

function FolderSize(fld: string): dword;
var
  sr: tsearchrec;
  r: integer;
  s: dword;
begin
  fld := includetrailingbackslash(fld);
  s := 0;
  r := findfirst((fld + '*.*'), faanyfile, sr);
  while (r = 0) do
  begin
    application.processmessages;
    if ((sr.attr and fadirectory) <> 0) then
    begin
      if ((sr.name <> '.') and (sr.name <> '..')) then
        s := s + foldersize(fld + sr.name);
    end
    else
      S := S + SR.FindData.nFileSizeLow;
    r := findnext(sr);
  end;
  sysutils.findclose(sr);
  result := s;
end;