(Delphi DLL) Generating Random ASCII Strings

Demonstrates how to generate random us-ascii strings.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Prng, Global;

...

procedure TForm1.Button1Click(Sender: TObject);
var
chilkatGlob: HCkGlobal;
success: Boolean;
fortuna: HCkPrng;
bDigits: Boolean;
bLowercase: Boolean;
bUppercase: Boolean;
i: Integer;

begin
// All Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob := CkGlobal_Create();
success := CkGlobal_UnlockBundle(chilkatGlob,'Anything for 30-day trial.');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGlobal__lastErrorText(chilkatGlob));
    Exit;
  end;

fortuna := CkPrng_Create();

// Generate random strings having only lowercase chars (a-z)
// Disallow digits and uppercase and only allow lowercase
bDigits := False;
bUppercase := False;
bLowercase := True;

Memo1.Lines.Add('-- only lowercase alpha (a-z)');
for i := 1 to 10 do
  begin
    // Generate 20-character strings.
    Memo1.Lines.Add(CkPrng__randomString(fortuna,20,bDigits,bLowercase,bUppercase));
  end;

// Allow both lowercase and uppercase alpha chars
bUppercase := True;
Memo1.Lines.Add('-- lower and uppercase alpha (a-zA-Z)');
for i := 1 to 10 do
  begin
    // Generate 20-character strings.
    Memo1.Lines.Add(CkPrng__randomString(fortuna,20,bDigits,bLowercase,bUppercase));
  end;

// Allow digits (0-9)
bDigits := True;
Memo1.Lines.Add('-- digits and lower/uppercase alpha (0-9a-zA-Z)');
for i := 1 to 10 do
  begin
    // Generate 20-character strings.
    Memo1.Lines.Add(CkPrng__randomString(fortuna,20,bDigits,bLowercase,bUppercase));
  end;

// Allow only digits (0-9)
bUppercase := False;
bLowercase := False;
Memo1.Lines.Add('-- only digits (0-9)');
for i := 1 to 10 do
  begin
    // Generate 20-character strings.
    Memo1.Lines.Add(CkPrng__randomString(fortuna,20,bDigits,bLowercase,bUppercase));
  end;

CkGlobal_Dispose(chilkatGlob);
CkPrng_Dispose(fortuna);

end;