delphi-UUID

The code is as follows

function GetLocalKID(guidstr: string; StrLength: Integer): string;
var
  CID, Res          : string;
  L, I1, I2, I3, K1, K2: Integer;
const
  F                 = '0123456789ABCDEF';
  T                 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-';
begin
  CID := guidstr;
  CID := ReplaceStr(CID, '{', '');
  CID := ReplaceStr(CID, '}', '');
  CID := ReplaceStr(CID, '-', '') + '0';
  if StrLength = 33 then
  begin
    Result := CID;
  end
  else if StrLength = 22 then
  begin
    Res := '';
    L := 1;
    while L < 33 do
    begin
      I1 := Pos(Copy(CID, L, 1), F);
      I2 := Pos(Copy(CID, L + 1, 1), F);
      I3 := Pos(Copy(CID, L + 2, 1), F);
      K1 := I1 * 4 + Trunc(I2 / 16);
      K2 := (I2 mod 16) * 4 + I3;
      Res := Res + Copy(T, K1, 1) + Copy(T, K2, 1);
      L := L + 3;
    end;
    L := Length(Res);
    while L < 22 do
    begin
      Res := Res + '0';
      L := L + 1;
    end;
    Result := Res;
  end;

end;

2. Use

function LocalKID(StrLength: Integer = 22): string;
var
  tmpGUID           : TGUID;
begin
  CreateGUID(tmpGUID);
  Result := GetLocalKID(GUIDToString(tmpGUID), StrLength);
end;