Delphi XE2 16进制转10进制《LceMeaning》

uses
  math;

function HexToDec(Hex : string) : string;
var
 i : integer;
 res : real;
 len : integer;
begin
   len := length(Trim(Hex));
   for i := 1 to len do
   begin
     case Hex[i] of
       ‘0‘..‘9‘: res := res + strToInt(Hex[i]) * power(16,(len-i));
       ‘a‘..‘f‘: res := res + (ord(Hex[i]) - ord(‘a‘) + 10) * power(16,(len-i));
       ‘A‘..‘F‘: res := res + (ord(Hex[i]) - ord(‘A‘) + 10) * power(16,(len-i));
     end;
   end;
   result := FloatToStr(res);
end;


var 
  CardName : string;
  sWriteData:array[0..320]of AnsiChar;  //16进制卡号
begin
  CardName := AnsiString(sWriteData1); //如果这里不先转化为AnsiString，则有时能正确转换，有时转换后的结果错误
  CardName := HexToDec(CardName);
end;