DLL封装Interface(接口)(D2007+win764位)

 

相关资料：

http://blog.csdn.net/liangpei2008/article/details/5394911

结果注意：

1.函数的传参方向必须一至。

 

DLL实例代码：

ZJQInterface.pas

unit ZJQInterface;

interface

type
  IInterface1 = interface
    function Func1: Integer;
    function Func2: Integer;
  end;
    
  IInterface2 = interface
    procedure Proc1;
    procedure Proc2;
  end;
  
implementation

end.

ZJQInterfaceDll.dpr

//************************************************************//
//  DLL封装接口
//************************************************************//
library ZJQInterfaceDll;

{ 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
  Dialogs,
  SysUtils,
  Classes,
  ZJQInterface in 'ZJQInterface.pas';

type
  TClass1 = class(TInterfacedObject, IInterface1, IInterface2)//可以继承一下接口
  public
    procedure Proc1;
    procedure Proc2;
    function Func1: Integer;
    function Func2: Integer;
  end; 

{$R *.res}    
{ TClass1 }

function TClass1.Func1: Integer;
begin
  ShowMessage('IInterface1.Func1');
  Result := 0;
end;

function TClass1.Func2: Integer;
begin
  ShowMessage('IInterface1.Func2');
  Result := 0;
end;

procedure TClass1.Proc1;
begin
  ShowMessage('IInterface2.Proc1');
end;

procedure TClass1.Proc2;
begin
  ShowMessage('IInterface2.Proc2');
end;

function CreateInterface: IInterface1; stdcall;//stdcall关键字必须有，因为UNIT1中也用到了这个，必须一至。
begin
  Result := TClass1.Create;
end;

exports
  CreateInterface;    
  
begin
end.

EXE实例代码：

Unit1.pas

//************************************************************//
//EXE调用DLL的接口实例
//程序运行不了，请生成新的DLL放在EXE的同目录里。
//************************************************************//
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,
  ZJQInterface, jpeg, ExtCtrls;//引入接口单元

type
  TForm1 = class(TForm)
    Button1: TButton;
    Image1: TImage;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
   //静态调用
  function CreateInterface: IInterface1; stdcall; external 'ZJQInterfaceDll.dll';//stdcall需要与DLL中的一至

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i1: IInterface1;
begin
  i1 := CreateInterface;
  i1.Func1;
  //i1 := nil;//全局的接口要写这行，局部的可以不写。
end;

end.

ZJQInterfaceExe.dpr 

program ZJQInterfaceExe;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.res}

begin
  Application.Initialize;
  ReportMemoryLeaksOnShutdown := True;//打开内存溢出提示 
  Application.MainFormOnTaskbar := True;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.