Re: Delphi random string

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Posted by webmaster Guido on May 21, 2003 at 18:57:45:

In Reply to: Random string posted by Joey on May 19, 2003 at 19:23:56:

: I was wondering if there is any way of making a random string with Delphi (for use as validation code).

: I would like it to be in letters and number like:
: 46TG76!

: I would like to be a 6 digit if possible and im not bothered if on the odd occassion its just all number or letters...

: Could any one do this for me?

: I Would like to be in a label... If its not to much hassle ;)

Here's some Delphi code that produces a random string with a length of 6 characters:

procedure TForm1.Button1Click(Sender: TObject);
  Chars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ!?/*+-';
  S: string;
  i, N: integer;
  S := '';
  for i := 1 to 6 do begin
    N := Random(Length(Chars)) + 1;
    S := S + Chars[N];
  Label1.Caption := S;

In constant "Chars" you specify which characters may appear in the string. For example, if you want to use all upper- and all lowercase letters, but no other characters, you modify the code like this:

  Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

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