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 := ;

 end;

 function TClass1.Func2: Integer;

 begin

   ShowMessage('IInterface1.Func2');

   Result := ;

 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.