原函数如下:
function StreamToHexStr(AStream: TStream): String;
const
HexChars: array[0..15] of Char = '0123456789ABCDEF';
var
i,len: Integer;
begin
len := AStream.Size - AStream.Position;
SetLength(Result, len * 2);
AStream.Read(Pointer(Result)^, len);
for i := len downto 1 do begin
Result[i * 2] := HexChars[Byte(Result[i]) and $0F];
Result[i * 2 -1] := HexChars[(Byte(Result[i]) and $F0) shr 4]
end;
end;求“反”函数
function HexStrToStream(AHexStr: String): TStream;
function StreamToHexStr(AStream: TStream): String;
const
HexChars: array[0..15] of Char = '0123456789ABCDEF';
var
i,len: Integer;
begin
len := AStream.Size - AStream.Position;
SetLength(Result, len * 2);
AStream.Read(Pointer(Result)^, len);
for i := len downto 1 do begin
Result[i * 2] := HexChars[Byte(Result[i]) and $0F];
Result[i * 2 -1] := HexChars[(Byte(Result[i]) and $F0) shr 4]
end;
end;求“反”函数
function HexStrToStream(AHexStr: String): TStream;
function HexStrToStream(AHexStr: String;AStream: TStream):Boolean;
var
iLen: Integer;
Buff: String;
P1,P2: PChar;
B: Byte;
begin
Result := False;
if Not Assigned(AStream) then Exit;
iLen := Length(AHexStr);
if iLen = 0 then Exit;
if (iLen mod 2) <> 0 then Exit;
SetString(Buff,Nil,iLen div 2);
P1 := PChar(AHexStr);
P2 := PChar(Buff);
while iLen > 0 do begin
if P1^ in ['0'..'9'] then
B := Ord(P1^) - Ord('0')
else if P1^ in ['A'..'F'] then
B := Ord(P1^) - Ord('A') + 10
else if P1^ in ['a','f'] then
B := Ord(P1^) - Ord('a') + 10
else
Exit;
B := B shl 4;
Inc(P1);
Dec(iLen);
if P1^ in ['0'..'9'] then
B := B + Ord(P1^) - Ord('0')
else if P1^ in ['A'..'F'] then
B := B + Ord(P1^) - Ord('A') + 10
else if P1^ in ['a','f'] then
B := B + Ord(P1^) - Ord('a') + 10
else
Exit;
Inc(P1);
Dec(iLen);
P2^ := Chr(B);
Inc(P2);
end;
AStream.WriteBuffer(PChar(Buff)^, Length(Buff));
Result := True;
end;