dllcomserver.dpr

Delphi 6分布式开发例程3.rar :)

library dllcomserver;

{ 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}

type
  TComp = Class   //定义基类
  public
    function Max(x,y:Integer):Integer;virtual;abstract;
    function Min(x,y:Integer):Integer;virtual;abstract;
  end;

  TCompImpl = Class(TComp)  //定义实现类
  public
    function Max(x,y:Integer):Integer;override;
    function Min(x,y:Integer):Integer;override;
  end;

{ TCompImpl }

function TCompImpl.Max(x, y: Integer): Integer;
begin
  if x > y then
    Result := x
  else
    Result := y;
end;

function TCompImpl.Min(x, y: Integer): Integer;
begin
  if x < y then
    Result := x
  else
    Result := y;
end;

//定义对象创建函数
function CreateCompImpl:TCompImpl;stdcall;
begin
  Result := TCompImpl.Create;
end;

//定义普通函数
function Add(x,y:Integer):Integer;stdcall;
begin
  Result := x + y;
end;

function Multi(x,y:Integer):Integer;stdcall;
begin
  Result := x * y;
end;

//定义输出子句
exports
  Add,Multi,CreateCompImpl;

begin
end.