function FileLoop(S: String; I: Integer; F: Integer): Boolean;
begin
  PrintLn('File: ' + S + '   (CRC = ' + IntToHex(GetCRC32FromFile(S), 8) + ')');
  Result := True;
end;

procedure ShowFiles;
var
  SL: TStringList;
begin
  SL := FileList('C:\*', False, False, False);
  ForEach(SL, 'FileLoop', 0);
  SL.Free;
end;

ShowFiles;