function passformat(pws:String; isRead:Boolean):String;
var
    temp_pws:String[30];
    pws_length,
    i:ShortInt;
begin
    randomize;            //初始化隨機數(shù)產(chǎn)生器
    pws_length := 0;
    if isRead then
    begin
        case pws[5] of
        '1'..'9' : pws_length := Integer(pws[5])-48;
        'a' : pws_length := 10;
        'b' : pws_length := 11;
        'c' : pws_length := 12;
        'd' : pws_length := 13;
        'e' : pws_length := 14;
        'f' : pws_length := 15;
        'g' : pws_length := 16;
        end;

        temp_pws := Copy(pws, 6, pws_length);     //===========
        for i:=1 to pws_length do
        begin
            temp_pws[i] := Char(Integer(temp_pws[i]) - 5);
        end;
    end

    else
    begin
        pws_length := length(pws);

        case pws_length of
        1..9 : temp_pws[5] := chr(48 + pws_length);
        10   : temp_pws[5] := 'a';
        11   : temp_pws[5] := 'b';
        12   : temp_pws[5] := 'c';
        13   : temp_pws[5] := 'd';
        14   : temp_pws[5] := 'e';
        15   : temp_pws[5] := 'f';
        16   : temp_pws[5] := 'g';
        end;

        for i := 1 to 4 do
        begin
            temp_pws[i] := chr(48 + Random(10));
        end;

        for i := 6 to 6 + pws_length - 1 do        //=========
        begin
            temp_pws[i] := Char(Integer(pws[i - 5]) + 5);  //=======
        end;

        for i := pws_length + 6 to 30 do        //===========
        begin
            temp_pws[i] := chr(97 + Random(26));
        end;

    end;

        temp_pws := copy(temp_pws,1,30); //返回長度為30位的串
        Result := temp_pws;
      
end;