'Public Declare Function Encode Lib "E:\Project1.Dll" Alias "Encode" (ByRef Source As String) As String
    Public Declare Function Encode Lib "E:\Project1.Dll" (ByVal Source As String) As String

library Project1;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  SysUtils,
  Classes;
{$R *.res}
function Encode(source : string):string;stdcall;
var
Source_Len,Len : integer;
Count,c : integer;
a1,a2 : byte;
ind : Word   ;
Encode_Str : string;
begin
Result := '';
Encode_Str := '';
Len := 0;
a1 := 0;
a2 := 0;
c := 0;
ind := 0;
Count := 0;
Source_Len := Length(source);
while Count < Source_Len do
begin
if Len >= $2710 then
break;
ind := ord(source[Count+1]);
ind := ind shr (c+2);
a1 := ind or a2;
a1 := a1 and $3f;
ind := ord(source[Count+1]);
ind := ind shl (8-(c+2));
ind := ind shr 2;
a2 := ind and $3f;
inc(c,2);
if c >= 6 then
begin
if Len >= $270f then
begin
Encode_Str := Encode_Str + chr(a1 + $3c);
inc(Len);
end
else
begin
Encode_Str := Encode_Str + chr(a1 + $3c);
Encode_Str := Encode_Str + chr(a2 + $3c);
Inc(Len,2);
end;
c := 0;
a2 := 0;
end
else
begin
Encode_Str := Encode_Str + chr(a1 + $3c);
Inc(Len);
end;
inc(Count);
end;
if c > 0 then
begin
Encode_Str := Encode_Str + chr(a2 + $3c);
Inc(Len);
end;
SetLength(Encode_Str,Len);
Result := Encode_Str;
end;
exports
    Encode;
begin
end.

[注意]传递专业知识、拓宽行业人脉——看雪讲师团队等你加入！