怎么把一个字符串转换成16进制数据,然后再把16进制数转成字符串?
unit BinHexTools;

interface
function HexToBin(HexNr : string): string; //把十六进制字符串转换为二进制字符串
function HexCharToInt(HexToken : char):Integer; //转换一个十六进制字符为整数
function HexCharToBin(HexToken : char): string;//转换一个十六进制字符为二进制字符串
function pow(base, power: integer): integer;//指数函数
function BinStrToInt(BinStr : string) : integer;//把二进制字符串转换为整数
function DecodeSMS7Bit(PDU : string):string;// 解码一个7-bit SMS (GSM 03.38) 为ASCII码
function ReverseStr(SourceStr : string) : string; //反转一个字符串

implementation
uses sysutils, dialogs; 

function HexCharToInt(HexToken : char):Integer; 
begin 
  {if HexToken>#97 then HexToken:=Chr(Ord(HexToken)-32); 
  { use lowercase aswell }

  Result:=0;
  if (HexToken>#47) and (HexToken<#58) then { 9 }
  Result:=Ord(HexToken)-48
  else if (HexToken>#64) and (HexToken<#71) then { F }
  Result:=Ord(HexToken)-65 + 10;
end;

function HexCharToBin(HexToken : char): string;
var DivLeft : integer;
begin
  DivLeft:=HexCharToInt(HexToken); { first HEX->BIN }
  Result:='';
  { Use reverse dividing }
  repeat { Trick; divide by 2 }
  if odd(DivLeft) then { result = odd ? then bit = 1 }
  Result:='1'+Result { result = even ? then bit = 0 }
  else
  Result:='0'+Result;
  DivLeft:=DivLeft div 2; { keep dividing till 0 left and length = 4 }
  until (DivLeft=0) and (length(Result)=4); { 1 token = nibble = 4 bits }
end;

function HexToBin(HexNr : string): string; 
{ only stringsize is limit of binnr } 
var Counter : integer; 
begin
  Result:=''; 

  for Counter:=1 to length(HexNr) do
  Result:=Result+HexCharToBin(HexNr[Counter]);
end;

function pow(base, power: integer): integer; 
var counter : integer; 
begin 
  Result:=1; 

  for counter:=1 to power do 
  Result:=Result*base; 
end; 


function BinStrToInt(BinStr : string) : integer; 
var counter : integer; 
begin 
  if length(BinStr)>16 then 
  raise ERangeError.Create(#13+BinStr+#13+ 
  'is not within the valid range of a 16 bit binary.'+#13); 

  Result:=0; 

  for counter:=1 to length(BinStr) do 
  if BinStr[Counter]='1' then 
  Result:=Result+pow(2,length(BinStr)-counter); 
end; 

function DecodeSMS7Bit(PDU : string):string; 
var OctetStr : string; 
  OctetBin : string; 
  Charbin : string; 
  PrevOctet: string; 
  Counter : integer; 
  Counter2 : integer; 
begin 
  PrevOctet:=''; 
  Result:=''; 

  for Counter:=1 to length(PDU) do 
  begin 
  if length(PrevOctet)>=7 then { if 7 Bit overflow on previous } 
  begin 
  if BinStrToInt(PrevOctet)<>0 then 
  Result:=Result+Chr(BinStrToInt(PrevOctet)) 
  else Result:=Result+' '; 

  PrevOctet:=''; 
  end; 

  if Odd(Counter) then { only take two nibbles at a time } 
  begin 
  OctetStr:=Copy(PDU,Counter,2); 
  OctetBin:=HexToBin(OctetStr); 

  Charbin:='';  做梦梦见老鼠
  for Counter2:=1 to length(PrevOctet) do 
  Charbin:=Charbin+PrevOctet[Counter2]; 


  for Counter2:=1 to 7-length(PrevOctet) do 
  Charbin:=OctetBin[8-Counter2+1]+Charbin; 

  if BinStrToInt(Charbin)<>0 then Result:=Result+Chr(BinStrToInt(CharBin)) 
  else Result:=Result+' '; 

  PrevOctet:=Copy(OctetBin,1,length(PrevOctet)+1); 
  end; 
  end; 
end; 

function ReverseStr(SourceStr : string) : string; 
var Counter : integer; 
begin 
  Result:=''; 

  for Counter:=1 to length(SourceStr) do 
  Result:=SourceStr[Counter]+Result; 
end;
16进制的就是STRING类型的！
要完成此效果需要两个步骤

第一步：把如下代码加入到 <head> 区域中

<SCRIPT  LANGUAGE= "JavaScript ">
<!--  Begin
binary_numbers  =  new  Array( "0000 ",  "0001 ",  "0010 ",  "0011 ",  "0100 ",  "0101 ", 
"0110 ",  "0111 ",  "1000 ",  "1001 ",  "1010 ",  "1011 ",  "1100 ",  "1101 ",  "1110 ",  "1111 ");


function  toBinary(High,  Low)  {
var  hiHex  =  "ABCDEF ";
if  (Low  <  10  )  {
LowNib  =  Low;
}
else  {
LowNib  =  10  +  hiHex.indexOf(Low); 
}
if  (High    <  10  )  {
HighNib  =  High;
}
else  {
HighNib  =  10  +  hiHex.indexOf(High);
}
eight_bits  =  binary_numbers[HighNib]  +  "  "  +  binary_numbers[LowNib];
return  eight_bits;
}
function  Dec2Hex(Decimal)  {
var  hexChars  =  "0123456789ABCDEF ";
var  a  =  Decimal  %  16;
var  b  =  (Decimal  -  a)/16;
hex  =  " "  +  hexChars.charAt(b)  +  hexChars.charAt(a);
L  =  hexChars.charAt(a);
H  =  hexChars.charAt(b);
return  hex;
}
var  symbols  =  "  !\ "#$%& '()*+ '-./0123456789:; <=> ?@ ";
function  toAscii  ()    {
var  loAZ  =  "abcdefghijklmnopqrstuvwxyz ";
symbols+=  UpperCase();
symbols+=  "[\\]^_` ";
symbols+=  loAZ;
symbols+=  "{|}~ ";
var  loc;
loc  =  symbols.indexOf(document.asciiform.Input.value);
if  (loc  > -1)  { 
Ascii_Decimal  =  32  +  loc;
return  (32  +  loc);
      }
return(0);    //  If  not  in  range  32-126  return  ZERO
}
function  getAscii(some_value)  {
Dec.value  =  toAscii();
Hex.value  =  Dec2Hex(toAscii()); 
document.asciiform.binary.value  =  toBinary(H,  L); 
}
//    End  -->
</script>


第二步：把如下代码加入到 <body> 区域中

<center>
<form  name= "asciiform "  onsubmit= "return  false; ">
<table  border=1> <tr> <td>
<center>
                        输入一个字符: 
                        <input  size=1  name=Input  maxlength=1  onChange= "getAscii(this.value) ">
<p>
                            <input  type=button    value= "显示 "  onClick= "Dec.value=toAscii() ">
</center>
                    <p> 
                        <input  size=10  name=toDec  onFocus= "this.blur() ">
                        ASCII码十进制输出 <br>
                        <input  size=10  name=toHex  onFocus= "this.blur() ">
                        ASCII码十六进制输出 <br>
                        <input  size=10  name=binary  onFocus= "this.blur() ">
                        ASCII码二进制输出 
                </td>
</tr>
</table>
</form>