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

 1 unit ZJQInterface;
 2 
 3 interface
 4 
 5 type
 6   IInterface1 = interface
 7     function Func1: Integer;
 8     function Func2: Integer;
 9   end;
10     
11   IInterface2 = interface
12     procedure Proc1;
13     procedure Proc2;
14   end;
15   
16 implementation
17 
18 end.

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ZJQInterfaceDll.dpr

 1 //************************************************************//
 2 //  DLL封装接口
 3 //************************************************************//
 4 library ZJQInterfaceDll;
 5 
 6 { Important note about DLL memory management: ShareMem must be the
 7   first unit in your library's USES clause AND your project's (select
 8   Project-View Source) USES clause if your DLL exports any procedures or
 9   functions that pass strings as parameters or function results. This
10   applies to all strings passed to and from your DLL--even those that
11   are nested in records and classes. ShareMem is the interface unit to
12   the BORLNDMM.DLL shared memory manager, which must be deployed along
13   with your DLL. To avoid using BORLNDMM.DLL, pass string information
14   using PChar or ShortString parameters. }
15 uses
16   Dialogs,
17   SysUtils,
18   Classes,
19   ZJQInterface in 'ZJQInterface.pas';
20 
21 type
22   TClass1 = class(TInterfacedObject, IInterface1, IInterface2)//可以继承一下接口
23   public
24     procedure Proc1;
25     procedure Proc2;
26     function Func1: Integer;
27     function Func2: Integer;
28   end; 
29 
30 {$R *.res}    
31 { TClass1 }
32 
33 function TClass1.Func1: Integer;
34 begin
35   ShowMessage('IInterface1.Func1');
36   Result := 0;
37 end;
38 
39 function TClass1.Func2: Integer;
40 begin
41   ShowMessage('IInterface1.Func2');
42   Result := 0;
43 end;
44 
45 procedure TClass1.Proc1;
46 begin
47   ShowMessage('IInterface2.Proc1');
48 end;
49 
50 procedure TClass1.Proc2;
51 begin
52   ShowMessage('IInterface2.Proc2');
53 end;
54 
55 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。
56 begin
57   Result := TClass1.Create;
58 end;
59 
60 exports
61   CreateInterface;    
62   
63 begin
64 end.

View Code

EXE实例代码：

Unit1.pas

 1 //************************************************************//
 2 //EXE调用DLL的接口实例
 3 //程序运行不了，请生成新的DLL放在EXE的同目录里。
 4 //************************************************************//
 5 unit Unit1;
 6 
 7 interface
 8 
 9 uses
10   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
11   Dialogs, StdCtrls,
12   ZJQInterface, jpeg, ExtCtrls;//引入接口单元
13 
14 type
15   TForm1 = class(TForm)
16     Button1: TButton;
17     Image1: TImage;
18     procedure Button1Click(Sender: TObject);
19   private
20     { Private declarations }
21   public
22     { Public declarations }
23   end;
24    //静态调用
25   function CreateInterface: IInterface1; stdcall; external 'ZJQInterfaceDll.dll';//stdcall需要与DLL中的一至
26 
27 var
28   Form1: TForm1;
29 
30 implementation
31 
32 {$R *.dfm}
33 
34 procedure TForm1.Button1Click(Sender: TObject);
35 var
36   i1: IInterface1;
37 begin
38   i1 := CreateInterface;
39   i1.Func1;
40   //i1 := nil;//全局的接口要写这行，局部的可以不写。
41 end;
42 
43 end.

View Code

ZJQInterfaceExe.dpr

 1 program ZJQInterfaceExe;
 2 
 3 uses
 4   Forms,
 5   Unit1 in 'Unit1.pas' {Form1};
 6 
 7 {$R *.res}
 8 
 9 begin
10   Application.Initialize;
11   ReportMemoryLeaksOnShutdown := True;//打开内存溢出提示 
12   Application.MainFormOnTaskbar := True;
13   Application.CreateForm(TForm1, Form1);
14   Application.Run;
15 end.

View Code