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.