Strings Delphi

{ StrTable sabiti string'in icerecegi karakterleri tutar }
function RandomString(PWLen: integer): string;
const StrTable: string =
'!#$%&/()=?@<>|{[]}\*~+#;:.-_' +
'ABCDEFGHIJKLMabcdefghijklm' +
'0123456789' +
'NOPQRSTUVWXYZnopqrstuvwxyz';
var
N, K, X, Y: integer;
begin
Randomize;
if (PWlen > Length(StrTable)) then K := Length(StrTable)-1
else K := PWLen;
SetLength(result, K);
Y := Length(StrTable);
N := 0;
while N < K do begin
X := Random(Y) + 1;
if (pos(StrTable[X], result) = 0) then begin
inc(N);
Result[N] := StrTable[X];
end;
end;
end;
// Kullanimi:
procedure TForm1.Button1Click(Sender: TObject);
begin
Label1.Caption := RandomString(30);
end;