String --> BCD

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Code:

function NumStringToBCD(const inStr: string): string;

function Pack(ch1, ch2: Char): Char;

begin

   Assert((ch1 >= '0') and (ch1 <= '9'));

   Assert((ch2 >= '0') and (ch2 <= '9'));

     {Ord('0') is $30, so we can just use the low nybble of the character

      as value.}

   Result := Chr((Ord(ch1) and $F) or ((Ord(ch2) and $F) shl 4))

end;

var

i: Integer;

begin

if Odd(Length(inStr)) then

   Result := NumStringToBCD('0' + instr)

else begin

   SetLength(Result, Length(inStr) div 2);

   for i := 1 to Length(Result) do

     Result[i] := Pack(inStr[2 * i - 1], inStr[2 * i]);

end;

end;

 

procedure TForm1.Button1Click(Sender: TObject);

var

S1, S2: string;

begin

S1 := '15151515151515151515';

S2 := NumStringToBCD(S1);

memo1.lines.add('S1: ' + S1);

memo1.lines.add('Length(S2): ' + IntToStr(Length(S2)));

memo1.lines.add('S2 unpacked again: ' + BCDToNumString(S2));

end;

 

 

©Drkb::00162

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