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procedure TForm1.Button2Click(Sender: TObject);
var
mbuf: array of byte;
mstr: string;
i: integer;
begin
mstr := '0x00 0x01';
mstr := StringReplace(mstr,'0x','',[rfReplaceAll]);
mstr := StringReplace(mstr,' ','',[rfReplaceAll]);
SetLength(mbuf,Length(mstr) div 2);
HexToBin(pchar(mstr),pchar(mbuf),Length(mstr) div 2);
for i:=0 to (Length(mstr) div 2)-1 do
showmessage(IntToStr(mbuf[i]));
end;