String → BCD
Материал из DRKB
String --> BCD[править | править код]
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;
Source: Взято с сайта http://www.swissdelphicenter.ch/en/tipsindex.php
ID: 00162