Mega Code Archive
How to convert a hexadecimal number into a Integer
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Title: How to convert a hexadecimal number into a Integer
function HexToInt(s: string): Longword;
var
b: Byte;
c: Char;
begin
Result := 0;
s := UpperCase(s);
for b := 1 to Length(s) do
begin
Result := Result * 16;
c := s[b];
case c of
'0'..'9': Inc(Result, Ord(c) - Ord('0'));
'A'..'F': Inc(Result, Ord(c) - Ord('A') + 10);
else
raise EConvertError.Create('No Hex-Number');
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(IntToStr(StrToHex('AAF1'))); // 43761
end;
{*************************************************}
procedure HexToInt(s: string): Integer;
begin
Result := StrToInt('$' + s);
end;
{*************************************************}
function HexToInt(strHexValue : string) : Integer;
var
c,l : integer;
begin
Val(strHexValue, l, c);
Result := l;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
ShowMessage(IntToStr(HexToInt('$EAD1')));
end;
{***************************************************}
unit HexConvert;
{ by Andr¨¦ Fritzsche }
interface
implementation
const
HexTbl: string = '0123456789ABCDEF';
{}
function HexTo(Value: string): Longword;
var
intX, PosCnt: Byte;
zwVal: Integer;
begin
Result := 0;
PosCnt := 0; //Halb-Byte-Position
for intX := Length(Value) - 1 downto 0 do
begin //alle Zeichen von links durchlaufen
zwVal := Pos(UpperCase(Value[intX + 1]), HexTbl) - 1; //pr¨¹fen, ob Zeichen aus Value
if zwVal = 0 then
begin //in HexTbl vorkommt und Position zu zwVal
Result := Result + (zwVal shl (4 * PosCnt));
//zwVal 4*Halbbyteposition Bits nach links verschieben
Inc(PosCnt); //Halb-Byte Position erh?hen
end;
end;
end;
{}
function ToHex(Value: Byte): string;
var
zwVal: Byte;
begin
zwVal := (Value and $0F); //erstes (Lo)-Byte von Value maskieren
Result := HexTbl[zwVal + 1]; //aus HexTbl zu Result
zwVal := (Value and $F0) shr 4;
Result := HexTbl[zwVal + 1] + Result; //aus HexTbl vor Result
end;
{}
function ToHex(Value: Word; Splitter: Char): string;
begin
Result := ToHex(Byte(Lo(Value))); //LoByte umwandeln, zu Result
Result := ToHex(Byte(Hi(Value))) + Splitter + Result;
//HiByte umwandeln, zu Result, Trennzeichen davorsetzen
end;
{}
function ToHex(Value: Cardinal; Splitter: Char): string;
var
zwVal: Word;
begin
zwVal := Value and $0000FFFF; //loword maskieren
Result := ToHex(Word(zwVal)); //umwandeln und zu Result
zwVal := (Value and $FFFF0000) shr 16; //hiword maskieren
Result := ToHex(Word(zwVal)) + Splitter + Result;
//umwandeln und zu Result, Trennzeichen davorsetzen
end;
{}
end.
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